如何从URL检查文件是否存在

您必须使用CURL

function does_url_exists($url) {    $ch = curl_init($url);    curl_setopt($ch, CURLOPT_NOBODY, true);    curl_exec($ch);    $pre = curl_getinfo($ch, CURLINFO_HTTP_CODE);    if ($pre == 200) {        $status = true;    } else {        $status = false;    }    curl_close($ch);    return $status;}