Last 5.3 release ever available: PHP 5.3.29 - 5.3 now EOL

preg_filter

(PHP 5 >= 5.3.0)

preg_filter正規表現による検索と置換を行う

説明

mixed preg_filter ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )

preg_filter()preg_replace() と似ていますが、マッチした結果 (を変換したもの) のみを返します。 この関数の挙動の詳細については preg_replace() のドキュメントを参照ください。

返り値

subject が配列の場合は配列を、それ以外の場合は文字列を返します。

マッチする結果が見つからなかったりエラーが発生したりした場合は、 subjectarray なら空の配列を返し、そうでなければ NULL を返します。

例1 preg_filter()preg_replace() の比較

<?php
$subject 
= array('1''a''2''b''3''A''B''4'); 
$pattern = array('/\d/''/[a-z]/''/[1a]/'); 
$replace = array('A:$0''B:$0''C:$0'); 

echo 
"preg_filter returns\n";
print_r(preg_filter($pattern$replace$subject)); 

echo 
"preg_replace returns\n";
print_r(preg_replace($pattern$replace$subject)); 
?>

上の例の出力は以下となります。

preg_filter returns
Array
(
    [0] => A:C:1
    [1] => B:C:a
    [2] => A:2
    [3] => B:b
    [4] => A:3
    [7] => A:4
)
preg_replace returns
Array
(
    [0] => A:C:1
    [1] => B:C:a
    [2] => A:2
    [3] => B:b
    [4] => A:3
    [5] => A
    [6] => B
    [7] => A:4
)

参考

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User Contributed Notes 4 notes

up
5
sajina_99 at hotmail dot de
2 years ago
As I had to work with PHP5.2.X and needed preg_filter I wrote a quick and dirty workaround.

<?php
 
if (!function_exists('preg_filter')) {
 
    function
preg_filter($pattern, $replace, $subject, $limit = -1 , &$count = null) {
   
      if(!
is_array($subject)) {
       
$noArray = 1 ;
       
$subject = array($subject);
      }

     
$preg = preg_replace($pattern, $replace, $subject, $limit,  &$count);

     
$diff = array_diff($preg, $subject);
     
      if(
$noArray == 1) $diff = implode($diff) ;

      return
$diff ;
     
    }
   
  }
?>
up
4
MrBertie
3 years ago
Another way to filter an array, and simply return the matching items: preg_grep!
up
0
fgmhhfg at gmail dot com
5 months ago
As for the php 5.5.3 version, the example  turn out like:
Array
(
       [0] => A:1
       [1] => B:a
       ...
)
up
-1
Anonymous
5 months ago
As for the php 5.5.3 version, the example will turn out like:
Array
(
       [0]=>A:1
       [1]=>B:a
       ...
)
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