資訊專欄INFORMATION COLUMN
摘要：加了代理，而對這個配置默認執行操作，導致了連接錯誤。失敗的執行時候會報錯這是因為通過調用自身的方法，使用根據主鍵去重復的邏輯覆蓋了的邏輯。
emoji
utf8 編碼問題 https://laravel-china.org/top...
function nickname_encode($s){
$chars = preg_split("http://u", $s, null, PREG_SPLIT_NO_EMPTY);
foreach ($chars as &$c) {
if (strlen($c) > 3 || $c === "%"){
$c = urlencode($c);
}
}
return implode($chars);
}
解碼直接用urldecode就行了。
strtotime
var_dump(date("Y-m-d", strtotime("2017-06-31")));
//輸出2017-07-01
var_dump(date("Y-m-d", strtotime("-1 month", strtotime("2017-03-31"))));
//輸出2017-03-03
var_dump(date("Y-m-d", strtotime("+1 month", strtotime("2017-08-31"))));
//輸出2017-10-01
var_dump(date("Y-m-d", strtotime("next month", strtotime("2017-01-31"))));
//輸出2017-03-03
var_dump(date("Y-m-d", strtotime("last month", strtotime("2017-03-31"))));
//輸出2017-03-03
var_dump(date("Y-m-d", strtotime("last day of -1 month", strtotime("2017-03-31"))));
//輸出2017-02-28
var_dump(date("Y-m-d", strtotime("first day of +1 month", strtotime("2017-08-31"))));
////輸出2017-09-01
var_dump(date("Y-m-d", strtotime("first day of next month", strtotime("2017-01-31"))));
////輸出2017-02-01
var_dump(date("Y-m-d", strtotime("last day of last month", strtotime("2017-03-31"))));
////輸出2017-02-28
需要獲得多少天之前 $day
mktime(0, 0, 0, date("m", $startTime), date("d", $startTime) - $day, date("Y", $startTime));
這個坑在carbon中一樣的有. 比如:Carbon::now()->subMonth(1)->startOfMonth() 一樣的會出現上面說的問題. 你必須這樣寫:Carbon::now()->startOfMonth()->subMonth(1)
Carbon::now()->subMonthNoOverflow(1)->startOfMonth()
https://laravel-china.org/articles/17317
$i = 12;
while($i >= 1) {
echo date("Y-m", strtotime("-" . $i . " month", strtotime("2018-8"))) . "
";
$i--;
}
https://laravel-china.org/art...
解決方法
運算符可 用于判斷$a變量不存在的情況（也可用于數組），而使用三元運算符判斷一個未定義的變量，PHP會拋出異常。也正是因為這樣，用??判斷一個賦值為0的變量的時候結果是不一樣的。https://laravel-china.org/articles/17304?#reply64712 $a=0; $c=1; $b=$a??$c; echo "a:".$a.",b:".$b.",c:".$c; //a:0,b:0,c:1 $a=0; $c=1; $b=$a?$a:$c; echo "a:".$a.",b:".$b.",c:".$c; //a:0,b:1,c:1Error while reading line from the server. [tcp://127.0.0.1:6379]
redis 加了代理 Twemproxy，而 predis 對這個配置默認執行 select 操作，導致了連接錯誤。
大家以后要注意，如果 redis 有代理的話，別忘了把 "database" => 0,這個配置刪掉。
https://laravel-china.org/top...
class person
{
protected $attributes = [];
public function __construct(array $attributes)
{
$this->attributes = $attributes;
}
public function __get($name)
{
return $this->attributes[$name] ?? null;
}
}
https://laravel-china.org/articles/12530/the-shock-php-empty-function-is-empty-but-the-actual-value-is-nonempty
https://laravel-china.org/topics/3021/isset-is-not-right-after-upgrading-php7
var_dump(
$person->firstName,
empty($person->firstName),
isset($person->firstName),
is_null($person->firstName)
);
Laravel Redis 多個進程同時取隊列問題
Laravel 使用 Redis 的 list 作為隊列的數據結構，并會為每個隊列分配一個 ID
Laravel 中入隊列方法
public function pushRaw($payload, $queue = null, array $options = [])
{
$this->getConnection()->rpush($this->getQueue($queue), $payload);
return Arr::get(json_decode($payload, true), "id");
}
用的是 Redis 的 rpush 命令。
Laravel 中取隊列方法
public function pop($queue = null)
{
$original = $queue ?: $this->default;
$queue = $this->getQueue($queue);
$this->migrateExpiredJobs($queue.":delayed", $queue);
if (! is_null($this->expire)) {
$this->migrateExpiredJobs($queue.":reserved", $queue);
}
list($job, $reserved) = $this->getConnection()->eval(
LuaScripts::pop(), 2, $queue, $queue.":reserved", $this->getTime() + $this->expire
);
if ($reserved) {
return new RedisJob($this->container, $this, $job, $reserved, $original);
}
}
這里用的是 lua 腳本取隊列，如下：
public static function pop()
{
return <<<"LUA"
local job = redis.call("lpop", KEYS[1])
local reserved = false
if(job ~= false) then
reserved = cjson.decode(job)
reserved["attempts"] = reserved["attempts"] + 1
reserved = cjson.encode(reserved)
redis.call("zadd", KEYS[2], ARGV[1], reserved)
end
return {job, reserved}
LUA;
}
那么結論是：從 Laravel 的處理方式和打印的日志結果看，即使多個進程讀取同一個隊列，也不會讀取到一樣的數據。
隊列執行失敗之后根本不會執行failed方法執行隊列偵聽器時加上 --tries參數即可，failed()方法只有在重試指定次數完成后才會調用failed()方法如：
http://blog.zhouchenxi.cn/pos...
php artisan queue:listen --queue=default,listeners --tries=3
順便提一下：如果指定了隊列名稱必須在偵聽器的參數上加上 --queue參數才行，不然沒有指定的隊列是不會運行的。
event 指定隊列
public $queue = "listeners";
public function queue($queue, $job, $data)
{
if (isset($this->queue, $this->delay)) {
return $queue->laterOn($this->queue, $this->delay, $job, $data);
}
if (isset($this->queue)) {
return $queue->pushOn($this->queue, $job, $data);
}
if (isset($this->delay)) {
return $queue->later($this->delay, $job, $data);
}
return $queue->push($job, $data);
}
php7不支持 preg_replace e修正符
車輪升級PHP7踩過的一些坑 http://php.swoole.com/wiki/%E...
php5 php7不兼容的地方：https://segmentfault.com/a/11...
$joinStr = preg_replace("/__([A-Z_-]+)__/e",$prex.".strtolower("$1")",$joinStr);
//替換為
preg_replace_callback("/__([A-Z_-]+)__/",function($r) use (&$joinStr){
$joinStr = $prex.strtolower($r[1]);
},$joinStr);
內存溢出
//https://laravel-china.org/articles/16312/handling-large-amounts-of-data-to-write-files-to-avoid-memory-overflow-and-response-timeout
$beginIndex = 0;
$pageLimit = 50000;
$endIndex = $beginIndex + $pageLimit;
while ($pageData = DB::connection("hub_log")->select("SELECT * FROM `{$tableName}` WHERE id > {$beginIndex} and id <= {$endIndex}")) {
foreach ($pageData as $row) {
file_put_contents(storage_path("mcd_rawdata/".$tableName.".txt"), $row->Content . "
", FILE_APPEND);
}
$beginIndex += $pageLimit;
$endIndex += $pageLimit;
}
$public_path = $time."test.txt";
DB::table("20171220")->orderBy("id")->chunk(10000,function($data) use ($public_path){
$arr = "";
foreach ($data->toArray() as $key => $value) {
$arr .= $value->Content."
";
}
file_put_contents(public_path($public_path),$arr, FILE_APPEND);
unset($data);unset($arr);
});
git bash 輸入python命令停滯
$ python -i
$ winpty python -3
round(a,2)
r = lambda f: f - f % 0.01
int(a*100)/100
print("%.2f" %a)
https://www.v2ex.com/t/482659...
def testFun():
return(lambda x : i*x for i in range(4))
for everyLambda in testFun():
print(everyLambda(2))
& python test.py
0
2
4
6
def testFun():
temp = [lambda x : i*x for i in range(4)]
return temp
for everyLambda in testFun():
print(everyLambda(2))
& python test.py
6
6
6
6
第一個是括號(), 為生成器, 返回 generator
第二個是中括號[], 為列表生成式, 返回數組 列表表達式是即時計算的, 而生成器是迭代時才會計算
{} + []
({}).valueOf() // []
// 返回來的是個對象,繼續調用 toString https://www.v2ex.com/t/480998#reply11
[].toString() // ""
[] + 1// "1"
[] + "a" // "a"
echo 后發送 header
使用 fastcgi_finish_request();（ PHP-fpm ）可以強制斷開客戶端連接 session 本質上是 header set-cookie，所以不算輸出。這里的輸出指的是 response body 的部分
https://www.v2ex.com/t/481127...
https://segmentfault.com/a/1190000016097997
class ProductCategory
{
const TYPES = [
1 => "type1",
2 => "type2",
];
public function getType()
{
return isset(self::TYPES[$this->type]) ? self:TYPES[$this->type] : "unrecognized_type";
}
}
//把漢字拆分為數組
function ch2arr($str)
{
return preg_split("http://u", $str, null, PREG_SPLIT_NO_EMPTY);
}
laravel 中使用 導出 excel 時報錯
PHPExcel_Calculation_Exception: Q5!A65 → Formula Error: An unexpected error occured in /application/www/web_git-pull/vendor/phpoffice/phpexcel/Classes/PHPExcel/Cell.php:291
原因：
在excel中一個單元格如果是以=開頭，則說明這個單元格是根據其他單元格的值算出來的，=后面必須跟著一個合法的表達式,而那個字符串是用戶的輸入，很明顯不應該是一個合法的表達式，所以應該在代碼中過濾掉
解決：
$str = " ".$str;//同時解決 如 11111111111 顯示成 1.11111E+29
參考
https://github.com/Maatwebsit...
https://stackoverflow.com/que...
gzip解碼問題
import urllib.request
import gzip
# 注意要先讀取內容才可以解壓縮
data = urllib.request.urlopen(url).read()
try:
html =data.decode("utf-8")
except:
html =gzip.decompress(data).decode("utf-8")
Intervention/Image 圖片寫入中文
https://laravel-china.org/topics/13642/problems-encountered-in-writing-chinese-with-interventionimage-pictures-and-solutions
function to_unicode($string)
{
$str = mb_convert_encoding($string, "UCS-2", "UTF-8");
$arrstr = str_split($str, 2);
$unistr = "";
foreach ($arrstr as $n) {
$dec = hexdec(bin2hex($n));
$unistr .= "&#" . $dec . ";";
}
return $unistr;
}
獲取某字段修改前的值
Issue::saving(function(Issue $issue){
if ($issue->isDirty("title")) {
$user = Auth::user()->username;
$oldTitle = $issue->getOriginal("title"); // 原始值
$newTitle = $issue->title; // 新值
ActionLog::log("$user 把標題 $oldTitle 修改為 $newTitle");
}
});
前一天
https://www.cnblogs.com/lhm166/articles/6066762.html
$mytime=mktime(0, 0, 0, date("m"), date("d")-1, date("Y"));//獲取時間戳
$mytime=date("Y-m-d H:i:s", strtotime("-1 day")); //獲取格式為2016-12-30 13:26:13
$timetoday = strtotime(date("Y-m-d",time()));
function mdate($time = NULL) {
$text = "";
$time = $time === NULL || $time > time() ? time() : intval($time);
$t = time() - $time; //時間差 （秒）
$y = date("Y", $time)-date("Y", time());//是否跨年
switch($t){
case $t == 0:
$text = "剛剛";
break;
case $t < 60:
$text = $t . "秒前"; // 一分鐘內
break;
case $t < 60 * 60:
$text = floor($t / 60) . "分鐘前"; //一小時內
break;
case $t < 60 * 60 * 24:
$text = floor($t / (60 * 60)) . "小時前"; // 一天內
break;
case $t < 60 * 60 * 24 * 3:
$text = floor($time/(60*60*24)) ==1 ?"昨天 " . date("H:i", $time) : "前天 " . date("H:i", $time) ; //昨天和前天
break;
case $t < 60 * 60 * 24 * 30:
$text = date("m月d日 H:i", $time); //一個月內
break;
case $t < 60 * 60 * 24 * 365&&$y==0:
$text = date("m月d日", $time); //一年內
break;
default:
$text = date("Y年m月d日", $time); //一年以前
break;
}
return $text;
}function friend_date($time)
{
if (!$time)
return false;
$fdate = "";
$d = time() - intval($time);
$ld = $time - mktime(0, 0, 0, 0, 0, date("Y")); //得出年
$md = $time - mktime(0, 0, 0, date("m"), 0, date("Y")); //得出月
$byd = $time - mktime(0, 0, 0, date("m"), date("d") - 2, date("Y")); //前天
$yd = $time - mktime(0, 0, 0, date("m"), date("d") - 1, date("Y")); //昨天
$dd = $time - mktime(0, 0, 0, date("m"), date("d"), date("Y")); //今天
$td = $time - mktime(0, 0, 0, date("m"), date("d") + 1, date("Y")); //明天
$atd = $time - mktime(0, 0, 0, date("m"), date("d") + 2, date("Y")); //后天
if ($d == 0) {
$fdate = "剛剛";
} else {
switch ($d) {
case $d < $atd:
$fdate = date("Y年m月d日", $time);
break;
case $d < $td:
$fdate = "后天" . date("H:i", $time);
break;
case $d < 0:
$fdate = "明天" . date("H:i", $time);
break;
case $d < 60:
$fdate = $d . "秒前";
break;
case $d < 3600:
$fdate = floor($d / 60) . "分鐘前";
break;
case $d < $dd:
$fdate = floor($d / 3600) . "小時前";
break;
case $d < $yd:
$fdate = "昨天" . date("H:i", $time);
break;
case $d < $byd:
$fdate = "前天" . date("H:i", $time);
break;
case $d < $md:
$fdate = date("m月d日 H:i", $time);
break;
case $d < $ld:
$fdate = date("m月d日", $time);
break;
default:
$fdate = date("Y年m月d日", $time);
break;
}
}
return $fdate;
}
phpstorm xdebug
https://www.cnblogs.com/baoch...
https://www.cnblogs.com/niuxi...
https://laravel-china.org/top...
https://laravel-china.org/art...
https://laravel-china.org/art...
如果出現Can"t start listening for connections from "xdebug": Port 9000 is busy 可修改端口號，要修改兩個地方 第一個地方是剛才php.ini里面的xdebug.remote_port=9000 第二個地方是phpstorm - setting - Languages&Frameworks - 相應的語言（比如PHP） - debug - 修改里面的Debug portPython for 循環中的陷阱
https://www.v2ex.com/t/470443...
pyinstaller 打包 exepyinstaller -p venv_path (中間一定要有空格) you.py https://www.v2ex.com/t/476247...
http://ju.outofmemory.cn/entr...
function fatal_handler() {
$errfile = "unknown file";
$errstr = "shutdown";
$errno = E_CORE_ERROR;
$errline = 0;
$error = error_get_last();
if($error){
//發送郵件隊列也可以http://www.iamtb.cn/2017/11/17/php-catch-fatel-error/
file_put_contents("./testerror11.txt", json_encode($error));
}
}
register_shutdown_function("fatal_handler");
try{
$db=new db();
}catch(Exception $e){
echo $e->error_msg();
}
PHP7開始，含十六進制字符串不再被認為是數字
$str = "0xffff";//https://segmentfault.com/q/1010000004829059
$int = filter_var($str, FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX);
if (false === $int) {
throw new Exception("Invalid integer!");
}
var_dump($int); // int(65535)
$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * (filter_var("0xd5b42e11", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)));
var_dump($t1,$t2);
php artisan config:cache
cat config/sentry.php
return array(
"dsn" => env("SENTRY_LARAVEL_DSN"),
// capture release as git sha
// "release" => trim(exec("git log --pretty="%h" -n1 HEAD")),
// Capture bindings on SQL queries
"breadcrumbs.sql_bindings" => true,
// Capture default user context
"user_context" => false,
//transport function
"transport"=>function(Raven_Client $raven_Client,&$data){
$raven_Client->setTransport(null);
$raven_Client->close_curl_resource();
Queue::pushOn("sentry",new AppCommandssentry($raven_Client,$data));
},
);
"transport"=>new appSentryTransport(),
class SentryTransport
{
public static function __set_state($arr){
return function($raven_Client,&$data){
Queue::pushOn("sentry",new AppCommandssentry($raven_Client,$data));
};
}
}
curl超時
//重試
$ch = curl_init();
// curl_setopt ($ch, CURLOPT_URL, "produc_redis.php.com");
curl_setopt ($ch, CURLOPT_URL, "11.11.11.1");
https://segmentfault.com/a/1190000011188541
// I changed UA here
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1");
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt ($ch, CURLOPT_AUTOREFERER, true);
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 2);
$html = curl_exec($ch);
var_dump($html,curl_error($ch));
$num=3;
for($i=1;$i<=$num;$i++){
if(curl_getinfo($ch,CURLINFO_HTTP_CODE)=="0" && $i<=$num){
echo "retry $i 次".PHP_EOL;
if($i==3){
curl_setopt ($ch, CURLOPT_URL, "220.181.57.217");
}
$html = curl_exec($ch);
}
}
var_dump($html);
var_dump(curl_error($ch));
// var_dump(curl_getinfo($ch));
/**
* curl請求
*https://segmentfault.com/a/1190000010197068
* @param $url
* @param string $postData
* @param int $timeout
* @return array|mixed
* @throws Exception
*/
protected static function post($url, $postData = "", $timeout = 5)
{
$ret = array();
$times = 5;
do {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HEADER, false);
if ($postData != "") {
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
}
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
// 重要, 該處不能丟 curl 執行最大秒數
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
$output = curl_exec($ch);
if ($errNo = curl_errno($ch)) {
error_log("Error [$errNo]: " . curl_error($ch));
} else {
$ret = json_decode($output, true);
// 解析的結果集為空時停止查詢
if (!is_array($ret) && !trim($ret)) {
throw new Exception(__METHOD__ . ": cURL調用失敗, 信息為: " . $output);
}
unset($output);
}
curl_close($ch);
if (isset($ret[0]) && $ret[0]) {
return $ret;
}
} while ($times--);
exit(__METHOD__ . ": cURL請求重試至 {$times} 次后仍無響應, 執行退出");
}
cURL error 28
cURL error 28: See http://curl.haxx.se/libcurl/c/libcurl-errors.html
$client=new GuzzleHttpClient();
try {
$tmp = $client->get($url,array("timeout"=>3,"connect_timeout"=>3));
$res = json_decode(strval($tmp->getBody()),1);
} catch (Exception $e) {
$res = [];
Log::info("error", ["url" => $url, "msg" => $e->getMessage()]);
}
$client=new GuzzleHttpClient();
$requests=[
$client->createRequest("GET",$url,["timeout"=>3,"connect_timeout"=>3]),
$client->createRequest("GET",$url2,["timeout"=>3,"connect_timeout"=>3]),
];
$result = Pool::batch($client, $requests, ["pool_size" => 2]);
//$result->getResult($requests[0]) instanceof GuzzleHttpMessageResponse
if ($result[0] instanceof Response && $result[0]->getStatusCode() == 200) {
$data = json_decode($result[0]->getBody(), true);
}
格式化
import prettytable as pt https://www.v2ex.com/t/483984#reply15 ## 按行添加數據 tb = pt.PrettyTable() tb.field_names = ["City name", "Area", "Population", "Annual Rainfall"] tb.add_row(["Adelaide",1295, 1158259, 600.5]) tb.add_row(["Brisbane",5905, 1857594, 1146.4]) tb.add_row(["Darwin", 112, 120900, 1714.7]) tb.add_row(["Hobart", 1357, 205556,619.5]) print(tb) #str.ljust 和 rjust 才是王道，誰用誰知道！ +-----------+------+------------+-----------------+ | City name | Area | Population | Annual Rainfall | +-----------+------+------------+-----------------+ | Adelaide | 1295 | 1158259 | 600.5 | | Brisbane | 5905 | 1857594 | 1146.4 | | Darwin | 112 | 120900 | 1714.7 | | Hobart | 1357 | 205556 | 619.5 | +-----------+------+------------+-----------------+unicode
Unicode 每個字符的詳情，可以查官方文檔： https://www.unicode.org/charts/
python2 代碼：
for i in range(0x005b,0x005f):
print (unichr(i))#print (chr(i))
python3 代碼請查看 http://www.chenxm.cc/post/683...
unicode 字符表示方法 u + 16 進制數值,例如 u0001 print("".join(chr(u) for u in range(0, 0x41))) u0040 這里 0040 就是 16 進制的，range 是左閉右開的，所以u0020-u0040 的碼點范圍是 range(0x00, 0x40+1)
0b 二進制 0o 八進制 0x 16 進制
0b10 // 2
0o10 // 8
0x10 // 16
unicode 字符表示方法 u + 16 進制數值,例如 u0001
print(u"u0061") // ahttps://www.v2ex.com/t/484923...
https://laravel-china.org/articles/16566/take-a-laravel-mysql-to-verify-the-experience-of-bug#reply62596 //創建數據 $meeting = meeting::create($data); //查詢數據 $meeting = meeting::findOrFail($meeting->id); //紀錄操作日志 Log::insert($meeting); 線上數據庫是讀寫分離的，主庫寫入，但更新數據后馬上查詢，從庫可能沒來得及更新數據 當網絡不好時遇到從庫更新不及時 findOrFail 就會報 404，導致后面所有操作都失效，自然驗證也失效了 解決方法 更新完后，查詢指定使用主庫 更新后禁止查詢，直接使用 create 返回的 model 實例，對于數據庫中的有默認值的字段，手動加入到 model 實例中批量更新
//https://laravel-china.org/topics/6864/how-to-batch-update-accumulate-a-field
https://laravel-china.org/articles/16620/laravel-project-execl-batch-import-database-data-update-data-no-insertion
$arr = [
// user_id => reward
"1" => 50,
"2" => 30,
"3" => 60
];
User::find(array_keys($arr))->each(function ($query) use ($arr) {
$query->increment("award" , $arr[$query->id]);
});
# 批量更新相同的 award
User::find(array_keys($arr))->each->increment("award", 30);
/**
* 批量更新表的值，防止阻塞
* @note 生成的SQL語句如下：
* update mj_node set sort = case id
* when 13 then 1
* when 1 then 4
* when 7 then 5
* when 8 then 6
* when 9 then 7
* when 10 then 8
* when 11 then 9
* when 12 then 10
* end where id in (13,1,7,8,9,10,11,12)
* @param $conditions_field 條件字段
* @param $values_field 需要被更新的字段
* @param $conditions
* @param $values
* @return int
*/
public function batchUpdate($conditions_field, $values_field, $conditions, $values)
{
$table = $this->model->getFullTableName();//返回完整表名，自己在項目中定義
$sql = "update " . $table . " set ". $values_field ." = case " .$conditions_field;
foreach ($conditions as $key => $condition) {
$sql .= " when " . $condition . " then ?";
}
$sql .= " end where id in (" . implode(",", $conditions) . ")";
return DB::update($sql, $values);//項目中需要引入DB facade
}
cat 多換行
https://www.v2ex.com/t/188162 調試shell腳本可以使用 sh -x ****.sh，有詳細輸出內容 Bash的echo默認在末尾加了換行符" "，所以你cat那個文件多了一個換行符，給echo加上-n參數就能不自動加換行符了。 var= cat tmp.txt;echo $var"abc" 改成如下的形式 var= `cat tmp.txt`;echo $var"abc"或者 #注意不是單引號，是tab鍵上面1前面的那個符號 var=$(cat tmp.txt);echo $var"abc"grep and or
https://blog.csdn.net/jackaduma/article/details/6900242 grep -E "Tech|Sales" employee.txt grep -v "pattern1" filename $ grep -E "Manager.*Sales|Sales.*Manager" employee.txt # -E "pattern1.*pattern2" egrep "php.*artisan.*$1" egrep "pattern1|pattern2" filenamememcached 默認的過期時間則 不能大于 30 天
https://laravel-china.org/top...
cron 內容最后一行未回車https://segmentfault.com/a/11... crontab -u www -e
unix:///tmp/supervisor.sock refused connection[root@localhost supervisor]# supervisorctl -c /etc/supervisord.conf unix:///tmp/supervisor.sock refused connection supervisor> exit rm -f /tmp/supervisor.sock [root@localhost supervisor]# ps aux|grep super root 48 0.0 0.0 0 0 ? S 2017 2:17 [sync_supers] root 8246 0.0 0.1 208064 13404 ? Ss 18:17 0:00 /usr/bin/python /usr/bin/supervisord -c /etc/supervisord.conf supervisord是服務端，是個deamon，supervisorctl是客戶https://www.v2ex.com/t/210122 修改supervisor.conf文件后，要執行supervisorctl reload，重新加載配置文件 vi artisan.conf [root@localhost supervisor]# supervisorctl status unix:///tmp/supervisor.sock no such file [root@localhost supervisor]# ps aux|grep super root 48 0.0 0.0 0 0 ? S 2017 2:17 [sync_supers] root 19472 0.0 0.0 103256 844 pts/5 S+ 19:57 0:00 grep super [root@localhost supervisor]# supervisord -c /etc/supervisord.conf Error: Invalid user name www in section "program:artisan_queue" (file: "/etc/supervisor/artisan.conf") For help, use /usr/bin/supervisord -h [root@localhost supervisor]# vi /etc/supervisor/artisan.conf [root@localhost supervisor]# supervisord -c /etc/supervisord.conf [root@localhost supervisor]# supervisorctl status artisan_queue BACKOFF Exited too quickly (process log may have details) http://blog.51cto.com/jxlwc/2112062 https://www.jianshu.com/p/3658c963d28bSpecified key was too long
https://laravel-china.org/articles/17094/larave-admin-installation?#reply64528
默認的數據庫字符集，現在utf8mb4包括存儲emojis支持。如果你運行MySQL v5.7.7或者更高版本，則不需要做任何事情。
https://laravel-china.org/articles/4195/laravel-54-common-error-specified-key-was-too-long
https://segmentfault.com/a/1190000008416200
把config下的database.php下的mysql設置中,將"strict" => false就行了..
Schema::defaultStringLength(191); 是設置好的默認的字符串長度，也就是說，遷移中的字段沒有設置長度的話，varchar 字段會被默認成長度只有 191
use IlluminateSupportFacadesSchema;
public function boot()
{
Schema::defaultStringLength(191);
}
laravel with 查詢中只查詢個別字段
select 的時候沒有 id 的話就會為 null https://laravel-china.org/articles/17379
public function brand()
{
return $this->belongsTo(Brand::class, "brandId")->select("id", "briefCode");
}
$result = Brand::with(["brand" => function($query){
$query->select("id", "briefCode");
}])->get();
PHP輸出A到Z
for($i="A"; $i<="Z"; $i++)
{
echo $i . "
";
}
for($i=ord("A"); $i<=ord("Z"); $i++)
{
echo chr($i) . "
";
}
for($i = "A"; $i != "BB"; $i++)
{
echo $i . "
";
}
$al = "A";
while($al != "BB")
{
echo $al++ . "
";
}
env函數的小坑
dump(env("APP_ENV") === null); // true
因為沒有執行 config:cache 命令，而項目上線后為了優化訪問速度，生成了緩存文件，導致env取值失敗
如果使用了config:cache，env函數只能在config目錄下的配置文件的php里使用，不可以在其他地方使用。
一個非常簡單的辦法就是將
env("APP_ENV")改為config("app.env")
config函數會優先讀取 bootstrap/cache/config.php 中緩存的配置，如果沒有緩存文件，則會直接讀取 config 目錄下的所有配置文件
https://www.jianshu.com/p/83f9cd407751
任務調度的列表
//1. 加載Console內核 app()->make(IlluminateContractsConsoleKernel::class); //2. 獲取計劃任務列表 $scheduleList = app()->make(IlluminateConsoleSchedulingSchedule::class)->events();在模型事件中獲取某字段修改前的值
Issue::saving(function(Issue $issue){
if ($issue->isDirty("title")) {
$user = Auth::user()->username;
$oldTitle = $issue->getOriginal("title"); // 原始值https://laravel-china.org/wikis/16169
$newTitle = $issue->title; // 新值
ActionLog::log("$user 把標題 $oldTitle 修改為 $newTitle");
}
});
laravel SerializesModels
因為我們在任務類里引用了 SerializesModels 這個 trait，使得 Eloquent 模型在處理任務時可以被優雅地序列化和反序列化。如果你的隊列任務類在構造器中接收了一個 Eloquent 模型，那么只有可識別出該模型的屬性會被序列化到隊列里。當任務被實際運行時，隊列系統便會自動從數據庫中重新取回完整的模型。這整個過程對你的應用程序來說是完全透明的，這樣可以避免在序列化完整的 Eloquent 模式實例時所帶來的一些問題。https://laravel-china.org/top...
composer require失敗cat composer.json
"monolog/monolog": "^2.0@dev",
$ composer require dees040/laravel-api-responses
1/1: https://packagist.laravel-china.org/p/provider-latest$0449728151603 e355a0ee137fb34881e699652e41e3e1de11ba9c4ea7a47a312.json
Finished: success: 1, skipped: 0, failure: 0, total: 1
Using version dev-master for dees040/laravel-api-responses
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- The requested package monolog/monolog (locked at 1.23.0, required as ^2.0@dev ) is satisfiable by monolog/monolog[1.23.0] but these conflict with your requiremen ts or minimum-stability.
Problem 2
- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].
- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].
- laravel/framework v5.5.42 requires monolog/monolog ~1.12 -> satisfiable by mo nolog/monolog[1.x-dev].
- Can only install one of: monolog/monolog[2.x-dev, 1.x-dev].
- Installation request for monolog/monolog ^2.0@dev -> satisfiable by monolog/m onolog[2.x-dev].
- Installation request for laravel/framework (locked at v5.5.42, required as 5. 5.*) -> satisfiable by laravel/framework[v5.5.42].
$composer require "monolog/monolog:~1.12"
1/1: https://packagist.laravel-china.org/p/provider-latest$d12a81f48a3e1dad512c1d2c375298e3a8ea414dff5000d5f345939429c6b29b.json
Finished: success: 1, skipped: 0, failure: 0, total: 1
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
1/1: https://dl.laravel-china.org/monolog/monolog/c465e1144536862e03f519cb3d65e924062cabfb.zip
Finished: success: 1, skipped: 0, failure: 0, total: 1
Package operations: 0 installs, 1 update, 0 removals
- Removing monolog/monolog (1.23.0)
- Installing monolog/monolog (1.x-dev c465e11):
Cloning c465e11445 from cache
Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead.
Writing lock file
Generating optimized autoload files
> IlluminateFoundationComposerScripts::postAutoloadDump
> @php artisan package:discover
Discovered Package: 96qbhy/hyid
Discovered Package: appstract/laravel-opcache
Discovered Package: appstract/lush-http
Discovered Package: barryvdh/laravel-debugbar
Discovered Package: barryvdh/laravel-dompdf
Discovered Package: barryvdh/laravel-ide-helper
Discovered Package: base62/base62
Discovered Package: cblink/laravel-excel-zip
Discovered Package: cblink/laravel-sso
Discovered Package: chumper/zipper
Discovered Package: encore/laravel-admin
Discovered Package: encore/redis-manager
Discovered Package: fideloper/proxy
Discovered Package: foryoufeng/laravel-generator
Discovered Package: ibrand/laravel-miniprogram-poster
Discovered Package: intervention/image
Discovered Package: itsgoingd/clockwork
Discovered Package: jacobcyl/ali-oss-storage
Discovered Package: jellybool/flysystem-upyun
Discovered Package: jenssegers/agent
Discovered Package: jenssegers/mongodb
Discovered Package: laravel-admin-ext/helpers
Discovered Package: laravel/tinker
Discovered Package: latrell/lock
Discovered Package: lubusin/laravel-decomposer
Discovered Package: maatwebsite/excel
Discovered Package: nesbot/carbon
Discovered Package: overtrue/laravel-query-logger
Discovered Package: overtrue/laravel-socialite
Discovered Package: prettus/l5-repository
Discovered Package: sentry/sentry-laravel
Discovered Package: simplesoftwareio/simple-qrcode
Discovered Package: spatie/laravel-tail
Discovered Package: tymon/jwt-auth
Discovered Package: zgldh/qiniu-laravel-storage
Package manifest generated successfully.
$ composer require dees040/laravel-api-responses
1/1: https://packagist.laravel-china.org/p/provider-latest$14d9ca1b35af157c565d6c564cde71c59043d7457135c5a4317471625a1db2e7.json
Finished: success: 1, skipped: 0, failure: 0, total: 1
Using version dev-master for dees040/laravel-api-responses
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
1/1: https://dl.laravel-china.org/dees040/laravel-api-responses/9aec7eb323fc45e17f1dbb9c6e203d240836f91b.zip
Finished: success: 1, skipped: 0, failure: 0, total: 1
Package operations: 1 install, 0 updates, 0 removals
- Installing dees040/laravel-api-responses (dev-master 9aec7eb): Cloning 9aec7eb323 from cache
Package phpoffice/phpexcel is abandoned, you should avoid using it. Use phpoffice/phpspreadsheet instead.
Writing lock file
Generating optimized autoload files
> IlluminateFoundationComposerScripts::postAutoloadDump
> @php artisan package:discover
$ composer require phpoffice/phpspreadsheet
1/2: https://packagist.laravel-china.org/p/provider-latest$8512051929ea08e8189e440a1f5293135717f61525e93d6f4577794143032dd5.json
2/2: https://packagist.laravel-china.org/p/provider-2018-10$4f971ac341cf575b7ed47aa09773abb926ec0c2baad56a0da2c9eed868beb649.json
Finished: success: 2, skipped: 0, failure: 0, total: 2
Using version dev-master for phpoffice/phpspreadsheet
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.
- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.
- maatwebsite/excel 3.0.9 requires phpoffice/phpspreadsheet ^1.2 -> satisfiable by phpoffice/phpspreadsheet[1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.5.0] but these conflict with your requirements or minimum-stability.
- Installation request for maatwebsite/excel (locked at 3.0.9) -> satisfiable by maatwebsite/excel[3.0.9].
Installation failed, reverting ./composer.json to its original content.
suping3@BJ-D-212361A MINGW64 /d/code/blog
$ composer require "phpoffice/phpspreadsheet:^1.2"
1/3: https://packagist.laravel-china.org/p/provider-2018-10$edb575ac09ff566f26e69fb52521dbd7b5bd90cb0e97c11c04a834f1ba157b0b.json
2/3: https://packagist.laravel-china.org/p/provider-latest$f7aba8aec5290950424531a654a2519842e07f0dcd995755aa8e64e7f622ad17.json
3/3: https://packagist.laravel-china.org/p/provider-2018-07$1f1ac5377ce1027162f91a3db54217c36e38f7ae18744629e6e89c5e6d410c78.json
Finished: success: 3, skipped: 0, failure: 0, total: 3
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
1/1: https://dl.laravel-china.org/phpoffice/phpspreadsheet/2dfd06c59825914a1a325f2a2ed13634b9d8c411.zip
Finished: success: 1, skipped: 0, failure: 0, total: 1
Fatal error: Class "PHPUnit_Framework_TestCase" not found
https://github.com/dees040/laravel-api-responses/issues/2 vi vendor/dees040/laravel-api-responses/tests/ResponseTest.php class ResponseTest extends PHPUnitFrameworkTestCase $ phpunit vendor/dees040/laravel-api-responses/tests/ResponseTest.php PHPUnit 6.5.3 by Sebastian Bergmann and contributors. .............. 14 / 14 (100%) Time: 378 ms, Memory: 16.00MBLaravel 的 collection
$collection = new IlluminateDatabaseEloquentCollection(["item a", "item b", "item c"]); $collection = $collection->unique(); 執行時候會報錯 PHP Fatal error: Call to a member function getKey() on string in /Project/nginx/webbpm-dev.ssl.lol/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Collection.php on line 259 [SymfonyComponentDebugExceptionFatalErrorException] Call to a member function getKey() on string 這是因為 IlluminateDatabaseEloquentCollection 通過調用自身的 getDictionary 方法，使用根據主鍵去重復的邏輯覆蓋了 IlluminateSupportCollection 的邏輯。 以上代碼改成https://laravel-china.org/topics/18696 $collection = collect(["item a", "item b", "item c"]); $collection = $collection->unique();使用"mews/captcha:~2.0" 驗證碼圖片不顯示問題
SymfonyComponentDebugExceptionFatalThrowableError: Call to undefined function InterventionImageGdimagettfbbox() in file /usr/share/nginx/html/LaraBBS/vendor/intervention/image/src/Intervention/Image/Gd/Font.php on line 85 如果已經開啟了gd，請參考下 https://laravel-china.org/articles/18815?#reply69185 FROM php:7.0-fpm RUN apt-get update && apt-get install -y libfreetype6-dev libjpeg62-turbo-dev libmcrypt-dev libpng-dev && docker-php-ext-install -j$(nproc) iconv mcrypt && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ && docker-php-ext-install -j$(nproc) gd在解析外部變量時的一個問題
//https://segmentfault.com/a/1190000017051950var_export($_POST); array ( "id" => array ( 0 => "1", 1 => "a", 2 => "2", 3 => "b", ), ) $foo["id"] = 1; $foo["id[]_text"] = 2; var_export($foo); extract($foo); var_export(get_defined_vars()); Laravel with () limit
比如如何取得每篇文章中的前10條評論
下面為錯誤寫法：https://laravel-china.org/articles/19932
essay::with(["comment" => function($query) {
$query->take(10)
}])
public function products()
{
return $this->belongsToMany(Hproduct::class,"hproduct_has_type","type_id","product_id");
}
public function topTenproducts()
{
return $this->products()->with("supplier")->where("is_sale","=",1)->limit(4);
}
public function getProdcutsWithtopTenproducts($col)
{
$model = $this->whereIn("id",$col)->get();
$model->each(function ($model) {
$model->load("topTenproducts");
});
return $model->toArray();
}
laravel 5.5 索引長度超過限制
laravel5.4中改變了默認的編碼類型(utf8 => utf8mb4), 從而使email字段索引長度超過了的默認限制長度 https://laravel-china.org/articles/18306
InnoDB 引擎中：
uft8 varchar 最大長度 255
utf8mb4 varchar 最大長度 191
設置一下 varchar 的長度不超過 191 即可
table->string("email")->index(); varchar會使用utf8mb4編碼, utf8mb4編碼(4bytes)屬于utf8編碼(3bytes)的擴展類型,
由此可以計算索引長度為255*4+2=1022 >767
$ php artisan migrate
Migration table created successfully.
In Connection.php line 664:
SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was t
oo long; max key length is 1000 bytes (SQL: alter table `users` add unique
`users_email_unique`(`email`))
golang序列化失敗
ret, _ := json.Marshal(result)//https://www.hchstudio.cn/article/2018/2622/
發現是結構體定義有問題，當定義結構體時首字母必須大寫才能序列化成功，這個特點在golang里面很是明顯，在函數調用時首字母小寫的函數在其他文件里面是調不到的。下面給出正確的結構體定義
type ResultCode struct {
Msg string `json:"msg"`
Code int `json:"code"`
Data string `json:"data"`
}
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