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preg_grep

(PHP 4, PHP 5, PHP 7)

preg_grep返回匹配模式的数组条目

说明

array preg_grep ( string $pattern , array $input [, int $flags = 0 ] )

返回给定数组input中与模式pattern 匹配的元素组成的数组.

参数

pattern

要搜索的模式, 字符串形式.

input

输入数组.

flags

如果设置为PREG_GREP_INVERT, 这个函数返回输入数组中与 给定模式pattern匹配的元素组成的数组.

返回值

返回使用input中key做索引的数组.

范例

Example #1 preg_grep() 示例

<?php
// 返回所有包含浮点数的元素
$fl_array preg_grep("/^(\d+)?\.\d+$/"$array);
?>

参见

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User Contributed Notes 4 notes

up
40
Daniel Klein
4 years ago
A shorter way to run a match on the array's keys rather than the values:

<?php
function preg_grep_keys($pattern, $input, $flags = 0) {
    return
array_intersect_key($input, array_flip(preg_grep($pattern, array_keys($input), $flags)));
}
?>
up
23
keithbluhm at gmail dot com
7 years ago
Run a match on the array's keys rather than the values:

<?php

function preg_grep_keys( $pattern, $input, $flags = 0 )
{
   
$keys = preg_grep( $pattern, array_keys( $input ), $flags );
   
$vals = array();
    foreach (
$keys as $key )
    {
       
$vals[$key] = $input[$key];
    }
    return
$vals;
}

?>
up
-4
Timo Klemm
7 months ago
An even shorter way to run a match on the array's keys rather than the values:

<?php
function preg_grep_keys($pattern, $input, $flags = 0) {
    return
array_flip( preg_grep($pattern, array_flip($input), $flags ) );
}
?>
up
-83
vickyssj7 at gmail dot com
3 years ago
A very simple example to match multiple "."(dot) in an array value:-

<?php

     $array
= array("23.32","22","12.009","23.43.43");
    
print_r(preg_grep("/^(\d+)?\.\d+\.\d+$/",$array));

?>
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