Check if a link is accessible via IPFS in PHP

index.php

<?php

/**
 * Checks if a given `$url` is hosted on IPFS
 * 
 * @param string $url
 * @return bool
 */
function checkIPFS($url)
{
    $headers = get_headers($url);
    $ipfs = false;

    $protocol = parse_url($url, PHP_URL_SCHEME);

    if ($protocol !== "ipfs") {
        foreach ($headers as $key => $value) {
            if (is_array($value)) {
                $value = end($value);
            }
            $headerParts = explode(":", $value);
            if ($headerParts[0] === "X-Ipfs-Path") {
                $ipfs = true;
                break;
            }
        }
    } else {
        $ipfs = true;
    }
    return $ipfs;
}