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;
}