如何使用 preg_match 在数组中搜索? [英] How to search in an array with preg_match?
问题描述
如何使用 preg_match 在数组中搜索?
How do I search in an array with preg_match?
示例:
<?php
if( preg_match( '/(my\n+string\n+)/i' , array( 'file' , 'my string => name', 'this') , $match) )
{
//Excelent!!
$items[] = $match[1];
} else {
//Ups! not found!
}
?>
推荐答案
在这篇文章中,我将为您提供三种不同的方法来完成您的要求.我实际上建议使用最后一个片段,因为它最容易理解,而且代码也非常简洁.
有一个专门用于此目的的函数,preg_grep
.它将接受一个正则表达式作为第一个参数,一个数组作为第二个参数.
There is a function dedicated for just this purpose, preg_grep
. It will take a regular expression as first parameter, and an array as the second.
看下面的例子:
$haystack = array (
'say hello',
'hello stackoverflow',
'hello world',
'foo bar bas'
);
$matches = preg_grep ('/^hello (\w+)/i', $haystack);
print_r ($matches);
输出
Array
(
[1] => hello stackoverflow
[2] => hello world
)
文档
- PHP:preg_grep - 手册
array_reduce
和 preg_match
可以干净利落地解决这个问题;请参阅下面的片段.
array_reduce
with preg_match
can solve this issue in clean manner; see the snippet below.
$haystack = array (
'say hello',
'hello stackoverflow',
'hello world',
'foo bar bas'
);
function _matcher ($m, $str) {
if (preg_match ('/^hello (\w+)/i', $str, $matches))
$m[] = $matches[1];
return $m;
}
// N O T E :
// ------------------------------------------------------------------------------
// you could specify '_matcher' as an anonymous function directly to
// array_reduce though that kind of decreases readability and is therefore
// not recommended, but it is possible.
$matches = array_reduce ($haystack, '_matcher', array ());
print_r ($matches);
输出
Array
(
[0] => stackoverflow
[1] => world
)
文档
是的,虽然它不涉及使用任何预先存在的 array_*
或 preg_*
函数,但它实际上更简洁.
Yes, and this one is actually cleaner though it doesn't involve using any pre-existing array_*
or preg_*
function.
如果您要多次使用此方法,请将其包装在一个函数中.
Wrap it in a function if you are going to use this method more than once.
$matches = array ();
foreach ($haystack as $str)
if (preg_match ('/^hello (\w+)/i', $str, $m))
$matches[] = $m[1];
文档
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