How to clear varnish cache files in php?

function clearVarnish($ip,$url,$host=null){
$errstr = '';
$errno = '';
$varnist_arr = isset($host) ? $host : C('VARNISH_LIST');
foreach ($varnist_arr as $v){
$fp = fsockopen ($ip, 2000, $errno, $errstr, 2);
if (!$fp) {
return false;
} else {
$out = "purge.url $url rn";
fputs ($fp, $out);
$out = fgets($fp , 4096);
fclose ($fp);
return $out;
}
}
}
?>

Note that the incoming url cannot be Parameters, for example: www.baidu.com/?tn=sougou Because the regular expression cleared after purge.url can be changed to www.baidu.com/(.?)sougou.

When a Varnish caches the content of multiple sites and needs to clear the specified site URL or simply clear the site homepage, purge must be used instead of purge.url.

2. Code:

function varnish_purge($ip, $host='', $url) {
$errstr = '';
$errno = '';
$fp = fsockopen ($ip, 2000, $errno, $errstr, 2);
if (!$fp) {
return $errno;
}else {
if(!empty($host)){
$out = "purge req.http.host == {$host } && req.url ~ ^/$ rn";
}else{
$out = " purge.url {$url} rn";
}
fputs ($fp, $out);
$out = fgets($ fp , 4096);
fclose ($fp);
return $out;
}
}