php中将网址转换为超链接的函数

复制代码代码如下:
function showtext（$text）{
$search = array（"|（http://[^ ]+）|", "|（https://[^ ]+）|", "|（www.[^ ]+）|"）;
$replace = array（"<a href="$1" target="_blank">$1</a>", "<a href="$1" target="_blank">$1</a>", "<a href="http://$1" target="_blank">$1</a>"）;
$text = preg_replace（$search, $replace, $text）;
return $text;
}