php实现使用正则将文本中的网址转换成链接标签，
复制代码 代码如下:
function text2links($str='') {
if($str=='' or !preg_match('/(http|www.|@)/i', $str)) { return $str; }
$lines = explode(" ", $str); $new_text = '';
while (list($k,$l) = each($lines)) {
// replace links:
$l = preg_replace("/([ ]|^)www./i", "\1http://www.", $l);
$l = preg_replace("/([ ]|^)ftp./i", "\1ftp://ftp.", $l);
$l = preg_replace("/(http://[^ ) !]+)/i",
"\1", $l);
$l = preg_replace("/(https://[^ ) !]+)/i",
"\1", $l);
$l = preg_replace("/(ftp://[^ ) !]+)/i",
"\1", $l);
$l = preg_replace(
"/([-a-z0-9_]+(.[_a-z0-9-]+)*@([a-z0-9-]+(.[a-z0-9-]+)+))/i",
"\1", $l);
$new_text .= $l." ";
}
return $new_text;
}
