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file_exists() is useful function can check the availability of a file. Below customized function enables you to check file availability not only local but also remote file as well.

// custom file_exists check file availability (local/remote)

function cfile_exists($url)
        if (preg_match("/http/", $url))
                $header_response = @get_headers($url, true);
                if (preg_match("/200 OK/", $header_response[0])) return true;
                else return false;
        else return (file_exists( $url) ? true:false);