<?php
echo "Hello, World!\n";
 
function check_url_exists($url)
{
    $ch = curl_init($url);
 
    curl_setopt_array($ch, [
        CURLOPT_NOBODY => true,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_TIMEOUT => 5,
        CURLOPT_SSL_VERIFYPEER => false,
    ]);
 
    curl_exec($ch);
 
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
    $cacheControl = curl_getinfo($ch, CURLINFO_HEADER_OUT); // just for debugging, not needed here
 
    curl_close($ch);
 
    return (
        $httpCode === 200 &&
        !empty($contentType) &&
        strpos($contentType, 'image/') === 0
    );
}
 
 
$result = check_url_exists("https://c...content-available-to-author-only...y.org/b/olid/OL13501127M-M.jpg");
echo $result ? "✅ Valid image URL\n" : "❌ Invalid or placeholder image\n";
?>
 

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