PHP之string之explode()函數使用

explode

• (PHP 4, PHP 5, PHP 7)
• explode — Split a string by string
• explode — 使用一個字符串分割另外一個字符串

Description

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，每一個元素都是 string 的一個子串，它們被字符串 delimiter 做爲邊界點分割出來。

Parameters

delimiter

• The boundary string.
• 邊界上的分隔字符。

string

• The input string.
• 輸入的字符串。

limit

• 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.
• 若是設置了 limit 參數而且是正數，則返回的數組包含最多 limit 個元素，而最後那個元素將包含 string 的剩餘部分。
• If the limit parameter is negative, all components except the last -limit are returned.
• 若是 limit 參數是負數，則返回除了最後的 -limit 個元素外的全部元素。
• If the limit parameter is zero, then this is treated as 1.
• 若是 limit 是 0，則會被當作 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.
• 因爲歷史緣由，雖然 implode() 能夠接收兩種參數順序，可是 explode() 不行。你必須保證 separator 參數在 string 參數以前才行。

Return Values

• 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，每一個元素都是 string 的一個子串，它們被字符串 delimiter 做爲邊界點分割出來。
• 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.
• 若是 delimiter 爲空字符串（""），explode() 將返回 FALSE。 若是 delimiter 所包含的值在 string 中找不到，而且使用了負數的 limit ， 那麼會返回空的 array， 不然返回包含 string 單個元素的數組。

Example

<?php
/**
 * Created by PhpStorm.
 * User: zhangrongxiang
 * Date: 2018/2/16
 * Time: 下午3:49
 */
// 示例 1
$pizza  = "piece1 piece2 piece3 piece4 piece5 piece6";
$pieces = explode( " ", $pizza );
echo $pieces[0] . PHP_EOL; // piece1
echo $pieces[1] . PHP_EOL; // piece2

// 示例 2
$data = "foo:*:1023:1000::/home/foo:/bin/sh";
list( $user, $pass, $uid, $gid, $gecos, $home, $shell ) = explode( ":", $data );
echo $user . PHP_EOL; // foo
echo $pass . PHP_EOL; // *
print_r( explode( ';', $data ) );//    [0] => 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
//若是 limit 參數是負數，則返回除了最後的 -limit 個元素外的全部元素。
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 );

See

• http://php.net/manual/en/func...

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