curl_download.php

<?php

const MAX_REDIRECTS = 5;

const MAX_WAIT = 30; // don't wait longer than N seconds.

const USER_AGENT = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36';

function curl_get_fileinfo($url): array
{
    $info = [];

    try {
        $ch = curl_init($url);

        // Issue a HEAD request and follow any redirects.
        curl_setopt($ch, CURLOPT_NOBODY, true);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_MAXREDIRS, MAX_REDIRECTS);
        curl_setopt($ch, CURLOPT_USERAGENT, USER_AGENT);
        curl_setopt($ch, CURLOPT_TIMEOUT, MAX_WAIT);

        $data = curl_exec($ch);
        $info = curl_getinfo($ch);
    } finally {
        @curl_close($ch);
    }

    print_r($info);

    return [
        'url' => $info['url'] ?? $url, // if there where redirects the actual URL is given
        'mime' => $info['content_type'] ?? 'image/*',
        'size' => $info['download_content_length'] ?? 0, // declared size in bytes
        'status' => $info['http_code'] ?? 404 // this will prevent an actual download if errors occured
    ];
}

function curl_get_file(string $url)
{
    try {
        $fp = fopen(dirname(__FILE__) . '/page-banner.jpg', 'w+');
        // Here is the file we are downloading, replace spaces with %20
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_TIMEOUT, 50);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_MAXREDIRS, MAX_REDIRECTS);
        curl_setopt($ch, CURLOPT_USERAGENT, USER_AGENT);
        curl_setopt($ch, CURLOPT_TIMEOUT, MAX_WAIT);
        // write curl response to file
        curl_setopt($ch, CURLOPT_FILE, $fp);
        // get curl response
        curl_exec($ch);
    } finally {
        @curl_close($ch);
        @fclose($fp);
    }
}

$url = getenv('URL');
curl_get_fileinfo($url);
curl_get_file($url);