从外部拥有的服务器检查目录或文件

Question

I am developing a script for a music company in PHP that has different servers so they need to display a file if it exists or not on the external server

like they have 3 versions of each music file mp3 mp4 etc ..... and they are accessing the files (each version ) from there specific external server . i have made three solutions for it all of them worked like charm but they are making the server slow .

First Method :

$handle = curl_init($url);
curl_setopt($handle,  CURLOPT_RETURNTRANSFER, TRUE);

/* Get the HTML or whatever is linked in $url. */
$response = curl_exec($handle);

/* Check for 404 (file not found). */
$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
if($httpCode == 404) {
    /* Handle 404 here. */
}

curl_close($handle);

/* Handle $response here. */

Second Method : Using NuSOAP i made an api which checks internally the file and returns yes/no

Third Method :

function checkurl($url)
{
    return true;
    $file_headers = @get_headers($url);
    //var_dump($file_headers);

    if($file_headers[0] == 'HTTP/1.1 302 Moved Temporarily' || $file_headers[0] =='HTTP/1.1 302 Found') {
        $exists = false;

    }
    else {
        $exists = true;
    }
    return $exists;
}

So i need a solution that doesn't makes the server slow any suggestions

Answer 1

Be sure to issue a HEAD request, not GET , since you don't want to get the file contents. And maybe you need to follow redirects, or not...

Example with curl (thanks to this blog post ):

<?php
$url = 'http://localhost/c.txt';

echo "\n checking: $url";

$c = curl_init(); 
curl_setopt( $c, CURLOPT_RETURNTRANSFER, true ); 
curl_setopt( $c, CURLOPT_FOLLOWLOCATION, true ); 
curl_setopt( $c, CURLOPT_MAXREDIRS, 5 ); 
curl_setopt( $c, CURLOPT_CUSTOMREQUEST, 'HEAD' ); 
curl_setopt( $c, CURLOPT_HEADER, 1 ); 
curl_setopt( $c, CURLOPT_NOBODY, true ); 
curl_setopt( $c, CURLOPT_URL, $url ); 
$res = curl_exec( $c );

echo "\n\ncurl:\n";
var_dump($res);

echo "\nis 200: ";
var_dump(false !== strpos($res, 'HTTP/1.1 200 OK'));

SOAP or other web service implementation can be an option if the file is not available by HTTP.

If you want to use get_headers(), please note that by default it's slow because it issues a GET request . To use HEAD request, you should change the default stream context (please check get_headers() on php manual):

stream_context_set_default(
    array(
        'http' => array(
            'method' => 'HEAD'
        )
    )
);

Answer 2

I thought it works with above answers but it wasnt working where there were too many requests so i finally try again and again and found this solution its working perfectly actually the problem was redirects too many of them so i set time_out 15 in curl and it worked

                        $ch = curl_init();

curl_setopt($ch, CURLOPT_URL,            $url);
curl_setopt($ch, CURLOPT_HEADER,         true);
curl_setopt($ch, CURLOPT_NOBODY,         true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT,        15);

$r = curl_exec($ch);
$r = split("\n", $r);
var_dump($r);