php使用正则表达式自动给网址加上链接

• 2014-04-10
• 1909 View

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:\/\/[^ )\r\n!]+)/i",
"<a href=\"\\1\">\\1</a>", $l);

$l = preg_replace("/(https:\/\/[^ )\r\n!]+)/i",
"<a href=\"\\1\">\\1</a>", $l);

$l = preg_replace("/(ftp:\/\/[^ )\r\n!]+)/i",
"<a href=\"\\1\">\\1</a>", $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;
}

//使用范例：
$text = "Visit www.jonasjohn.de :-)";

print text2links($text);