// 尽可能高效从一个标准url中获取文件的扩展名
// 例如 http://www.daiyuanpei.com/dai.php?id=1 取出 .php 或者 php
$url = 'http://www.daiyuanpei.com/dai.php?id=1';
// php
function getExt($url){
$arr = parse_url($url);
$file = basename($arr['path']);
$ext = explode('.', $file);
return $ext[1];
}
// php
function getExt2($url) {
$url = basename($url);
$pos1 = strpos($url, '.');
$pos2 = strpos($url, '?');
if(strstr($url, '?')){
return substr($url, $pos1+1, $pos2-$pos1-1);
}else{
return substr($url, $pos1);
}
}
