摘要：由于歷史原因，雖然可以接收兩種參數順序，但是不行。此函數返回由字符串組成的，每個元素都是的一個子串，它們被字符串作為邊界點分割出來。如果所包含的值在中找不到，并且使用了負數的，那么會返回空的，否則返回包含單個元素的數組。

(PHP 4, PHP 5, PHP 7)
explode — Split a string by string
explode — 使用一個字符串分割另一個字符串

array explode ( 
    string $delimiter , 
    string $string [, 
    int $limit = PHP_INT_MAX ] 
    )
//Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the string delimiter.
//此函數返回由字符串組成的數組，每個元素都是 string 的一個子串，它們被字符串 delimiter 作為邊界點分割出來。

The boundary string.

邊界上的分隔字符。

The input string.

輸入的字符串。

If limit is set and positive, the returned array will contain a maximum of limit elements with the last element containing the rest of string.

如果設置了 limit 參數并且是正數，則返回的數組包含最多 limit 個元素，而最后那個元素將包含 string 的剩余部分。

If the limit parameter is negative, all components except the last -limit are returned.

如果 limit 參數是負數，則返回除了最后的 -limit 個元素外的所有元素。

If the limit parameter is zero, then this is treated as 1.

如果 limit 是 0，則會被當做 1。

Note:

Although implode() can, for historical reasons, accept its parameters in either order, explode() cannot. You must ensure that the delimiter argument comes before the string argument.
由于歷史原因，雖然 implode() 可以接收兩種參數順序，但是 explode() 不行。你必須保證 separator 參數在 string 參數之前才行。

Returns an array of strings created by splitting the string parameter on boundaries formed by the delimiter.

此函數返回由字符串組成的 array，每個元素都是 string 的一個子串，它們被字符串 delimiter 作為邊界點分割出來。

If delimiter is an empty string (""), explode() will return FALSE. If delimiter contains a value that is not contained in string and a negative limit is used, then an empty array will be returned, otherwise an array containing string will be returned.

如果 delimiter 為空字符串（""），explode() 將返回 FALSE。 如果 delimiter 所包含的值在 string 中找不到，并且使用了負數的 limit ， 那么會返回空的 array， 否則返回包含 string 單個元素的數組。

 foo:*:1023:1000::/home/foo:/bin/sh

$str = "one|two|three|four";
// 正數的 limit
//[0] => one
//[1] => two|three|four
print_r( explode( "|", $str, 2 ) );
// 負數的 limit（自 PHP 5.1 起）
//[0] => one
//[1] => two
//[2] => three
//如果 limit 參數是負數，則返回除了最后的 -limit 個元素外的所有元素。
print_r( explode( "|", $str, - 1 ) );

$path = "/Users/zhangrongxiang/WorkSpace/phpProjects/PHPTEST";
//[0] =>
//[1] => Users
//[2] => zhangrongxiang
//[3] => WorkSpace
//[4] => phpProjects
//[5] => PHPTEST
$rs = explode( "/", $path );
print_r( $rs );

//[0] =>
//[1] => Users
//[2] => zhangrongxiang/WorkSpace/phpProjects/PHPTEST
$rs = explode( "/", $path, 3 );
print_r( $rs );

//[0] =>
//[1] => Users
//[2] => zhangrongxiang
$rs = explode( "/", $path, - 3 );
print_r( $rs );

/////////////////////////////////////////////////////////////////////////////////////
function multiexplode( $delimiters, $string ) {
    $ready = str_replace( $delimiters, $delimiters[0], $string );
    //here is a sample, this text, and this will be exploded, this also , this one too ,)
    echo $ready . PHP_EOL;
    $launch = explode( $delimiters[0], $ready );
    
    return $launch;
}

//[0] => here is a sample
//[1] =>  this text
//[2] =>  and this will be exploded
//[3] =>  this also
//[4] =>  this one too
//[5] => )
$text     = "here is a sample: this text, and this will be exploded. this also | this one too :)";
$exploded = multiexplode( array( ",", ".", "|", ":" ), $text );
print_r( $exploded );


/////////////////////////////////////////////////////////////////////////////////////
$str = "";
$res = explode( ",", $str );
//Array
//(
//    [0] =>
//)
print_r( $res );
$res = array_filter( explode( ",", $str ) );
//Array
//(
//)
print_r( $res );

/////////////////////////////////////////////////////////////////////////////////////
//a simple one line method to explode & trim whitespaces from the exploded elements
array_map( "trim", explode( ",", $str ) );
$str = "one  ,two  ,       three  ,  four    ";
//[0] => one
//[1] => two
//[2] => three
//[3] => four
print_r( array_map( "trim", explode( ",", $str ) ) );

/////////////////////////////////////////////////////////////////////////////////////
//the function
//Param 1 has to be an Array
//Param 2 has to be a String
function multiexplode2( $delimiters, $string ) {
    $ary = explode( $delimiters[0], $string );
    array_shift( $delimiters );
    if ( $delimiters != null ) {
        foreach ( $ary as $key => $val ) {
            $ary[ $key ] = multiexplode2( $delimiters, $val );
        }
    }
    
    return $ary;
}

// Example of use
$string     = "1-2-3|4-5|6:7-8-9-0|1,2:3-4|5";
$delimiters = Array( ",", ":", "|", "-" );

$res = multiexplode2( $delimiters, $string );
print_r( $res );

http://php.net/manual/en/func...