<?php
$string = 'aaaa3aaa6aaaa2aaaaaa0aaaaaa2aaa1a';$pattern=array('/(\d)/i');
$replace=array('[${1}]');
echo $string."<br/>";
echo preg_replace($pattern, $replace, $string);
?> 替换前:aaaa3aaa6aaaa2aaaaaa0aaaaaa2aaa1a
替换后:aaaa[3]aaa[6]aaaa[2]aaaaaa[0]aaaaaa[2]aaa[1]a
怎么个原理法啊?那个${1}如何解释啊?
$string = 'aaaa3aaa6aaaa2aaaaaa0aaaaaa2aaa1a';$pattern=array('/(\d)/i');
$replace=array('[${1}]');
echo $string."<br/>";
echo preg_replace($pattern, $replace, $string);
?> 替换前:aaaa3aaa6aaaa2aaaaaa0aaaaaa2aaa1a
替换后:aaaa[3]aaa[6]aaaa[2]aaaaaa[0]aaaaaa[2]aaa[1]a
怎么个原理法啊?那个${1}如何解释啊?
解决方案 »
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