解析/link?url=
<?php
$url = "/link?url=nS2MGJqjJ4zBBpC8yDF8xDh8vibi1lVeE7gGr9UONBu";
$info = parse_url($url);
$fp = fsockopen($info['host'], 80,$errno, $errstr, 30);
fputs($fp,"GET {$info['path']}?{$info['query']} HTTP/1.1\r\n");
fputs($fp, "Host: {$info['host']}\r\n");
fputs($fp, "Connection: close\r\n\r\n");
$rewrite = '';
while(!feof($fp)) {
$line = fgets($fp);
if($line != "\r\n" ) {
if(strpos($line,'Location:') !== false) {
$rewrite = str_replace(array("\r","\n","Location: "),'',$line);
}
}else {
break;
}
}
var_dump($rewrite); //结果显示：string(22) "/"
?>