array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'function.preg-filter.php', 1 => 'preg_filter', ), 'up' => array ( 0 => 'ref.pcre.php', 1 => 'PCRE 函数', ), 'prev' => array ( 0 => 'ref.pcre.php', 1 => 'PCRE 函数', ), 'next' => array ( 0 => 'function.preg-grep.php', 1 => 'preg_grep', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'zh', 'path' => 'reference/pcre/functions/preg-filter.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
preg_filter — 执行一个正则表达式搜索和替换
$pattern
,$replacement
,$subject
,$limit
= -1,&$count
= null
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.
preg_replace() 文档中描述了参数。
如果传递的正则表达式无法正常解析,会发出 E_WARNING
。
示例 #1 比较preg_filter() 和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));
?>
以上示例会输出:
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 )