php 判断远程文件是否存在
if (!function_exists('check_remote_file_exists')) {
/**
* 判断远程文件是否存在.
* @param $url string http或https开头的绝对地址
* @return string
* @Date: 2020-07-31 16:47:06
* @Author: code.cent123.com
*/
function check_remote_file_exists($url)
{
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_NOBODY, true);
//curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'GET');
$result = curl_exec($curl);
//print_r($result);
$bool = false;
if ($result !== false) {
$statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($statusCode == 200) {
$headInf = get_headers($url, 1);
$time = strtotime($headInf['Last-Modified']);
if ($time + 2 < time()) {
$bool = true;
}
}
}
curl_close($curl);
return $bool;
}
}
