<?PHP
/**
 * 文本URL转换为超链接
 *
 * @param 
 * @arrange (512.笔记) jb51.cc
 **/
function text2links($str='') {
    if($str=='' or !preg_match('/(http|www\.|@)/i',$str)) { return $str; }
    $lines = explode("\n",$str); $new_text = '';
    while (list($k,$l) = each($lines)) {
        // replace links:
        $l = preg_replace("/([ \t]|^)www\./i","\\1http://www.",$l);
        $l = preg_replace("/([ \t]|^)ftp\./i","\\1ftp://ftp.",$l);
        $l = preg_replace("/(http:\/\/[^ )
!]+)/i","<a href=\"\\1\">\\1</a>",$l);
        $l = preg_replace("/(https:\/\/[^ )
!]+)/i",$l);
        $l = preg_replace("/(ftp:\/\/[^ )
!]+)/i",$l);
        $l = preg_replace(
            "/([-a-z0-9_]+(\.[_a-z0-9-]+)*@([a-z0-9-]+(\.[a-z0-9-]+)+))/i","<a href=\"mailto:\\1\">\\1</a>",$l);
        $new_text .= $l."\n";
    }
    return $new_text;
}
/*** 来自：编程之家 jb51.cc（jb51.cc） ***/ 
?>