PHP implements using regular expressions to convert URLs in text into link tags, _PHP tutorial

php implementation uses regular expressions to convert URLs in text into link tags,

Copy code The code is as follows:

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://[^ )rn!]+)/i",
"\1", $l);
           $l = preg_replace("/(https://[^ )rn!]+)/i",
"\1", $l);
            $l = preg_replace("/(ftp://[^ )rn!]+)/i",
"\1", $l);
           $l = preg_replace(
"/([-a-z0-9_]+(.[_a-z0-9-]+)*@([a-z0-9-]+(.[a-z0-9-]+)+) )/i",
"\1", $l);
          $new_text .= $l."n";
}
Return $new_text;
}

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