Check if file exist in multiple domains - php

Question

I need to check if a file exist in multiple domains/servers and then show the download link to the user or write an error message. I have this script working for 1 domain:
<?php
$domain0='www.example.com';
$file=$_GET['file']
$resourceUrl = 'http://$domain0/$file';
$resourceExists = false;
$ch = curl_init($resourceUrl);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
//200 = OK
if ($statusCode == '200') {
$resourceExists = true;
}
if ($resourceExists == true) {
echo "Exist! $file";
} else {
echo "$file doesnt exist!";
}
?>
Now I need to check if that file exist in 4 domains, how can I do this? I don't know how to use arrays, so maybe if someone explain me ho to do this, I'll be very grateful.

Answer 1

I would create an array for domains
I would loop through the array with "foreach"
I would call a function to get the result
function checkFileOnDomain($file,$domain) {
$resourceUrl = "http://$domain/$file";
$ch = curl_init($resourceUrl);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
if($statusCode == '200')
return true;
}
$file=$_GET["file"];
// $_GET should be sanitized!
$domain_list=array("www.test1.com","www.test2.com");
foreach ($domain_list as $domain) {
echo "Check DOMAIN: $domain <hr/>";
if (checkFileOnDomain($file,$domain)) {
echo ">> [ $file ] EXISTS";
} else {
echo ">> [ $file ] DOES NOT EXIST";
}
echo "<br/><br/>";
} unset($domain);
EDIT:
To apply your specifications, you need an extra variable before foreach.
$link_to_file="";
foreach ($domain_list as $domain) {
if (checkFileOnDomain($file,$domain)) {
$link_to_file="$domain/$file";
break; // get first result and quit
}
} unset($domain);
if (!empty($link_to_file)) {
echo $link_to_file; //file is here
} else {
echo "404";
}

Answer 2

An array should solve the problem for you. This creates an array of the domains you want to check, and then cycles through them one by one running the code you wrote.
If you're struggling with arrays, have a look here for some more information
<?php
// Create an array of domains
$domains = ['www.example.com', 'www.example2.com', ...];
// Cycle through all the domains and run the code
foreach($domains as $domain) {
$domain0='www.example.com';
$file=$_GET['file']
$resourceUrl = 'http://$domain0/$file';
$resourceExists = false;
$ch = curl_init($resourceUrl);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
//200 = OK
if($statusCode == '200') {
$resourceExists = true;
} else if($resourceExists == false) {
}
if ($resourceExists == true) {
echo "Exist! $file";
} else {
echo "$file doesnt exist!";
}
}
?>