preg_filter

(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

说明

preg_filter(
    string|array $pattern,
    string|array $replacement,
    string|array $subject,
    int $limit = -1,
    int &$count = null
): string|array|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.

参数

preg_replace() 文档中描述了参数。

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

错误/异常

如果传递的正则表达式无法正常解析,会发出 E_WARNING

示例

示例 #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
)

参见

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