PCRE 函数
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preg_filter

(PHP 5 >= 5.3.0)

preg_filter执行一个正则表达式搜索和替换

说明

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

preg_filter()等价于preg_replace() 除了它仅仅返回(可能经过转化)与目标匹配的结果. 这个函数怎样工作的更详细信息请阅读 preg_replace()文档.

返回值

如果subject是一个数组, 返回一个数组, 其他情况返回一个字符串.

如果没有找到匹配或者发生了错误, 当subject数组 时返回一个空数组, 其他情况返回NULL.

范例

Example #1 比较preg_filter()preg_replace()的示例

<?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)); 
?>

以上例程会输出:

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
)

参见


PCRE 函数
在线手册:中文 英文
PHP手册
PHP手册 - N: 执行一个正则表达式搜索和替换

用户评论:

sajina_99 at hotmail dot de (25-Sep-2011 03:07)

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 ;
     
    }
   
  }
?>

MrBertie (31-Dec-2010 10:35)

Another way to filter an array, and simply return the matching items: preg_grep!

Eric Naeseth (18-Dec-2010 02:38)

If you want to just filter an array based on a regular expression, without replacing any of the array values, try RegexIterator: http://us3.php.net/manual/en/class.regexiterator.php