<?php
$url = 'str_memo=http://www.test.com/index.php?link=[URL]&title=[TITLE]';
$url = preg_replace('/(\[url\])/i', 'www.aaa.com', $url);
$url = preg_replace('/(\[title\])/i', 'helala', $url);
print $url;
?>
$url = 'str_memo=http://www.test.com/index.php?link=[URL]&title=[TITLE]';
$url = preg_replace('/(\[url\])/i', 'www.aaa.com', $url);
$url = preg_replace('/(\[title\])/i', 'helala', $url);
print $url;
?>
$content = eregi_replace("\\[url\\]([^\\[]*)\\[/url\\]","<a href=\"\\1\" target=_blank>\\1</a>",$content);
$content = eregi_replace("\\[url=([^\\[]*)\\]([^\\[]*)\\[/url\\]","<a href=\"\\1\" target=_blank>\\2</a>",$content);
$url = 'str_memo=http://www.test.com/index.php?link=[URL]&title=[TITLE]';
$url = preg_replace('/(\[url\])/i', '地址', $url);
$url = preg_replace('/(\[title\])/i', '标题', $url);
echo $url;
?>