PHP 正则 ${1} 解释
<!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--><?php
$string = 'aaaa3aaa6aaaa2aaaaaa0aaaaaa2aaa1a';
$pattern=array('/(\d)/i');
$replace=array('[${1}]');
echo $string."<br/>";
echo preg_replace($pattern, $replace, $string);
?>
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