检查远程URL上是否存在图像 [英] Check whether image exists on remote URL

问题描述

我正在为图书ISBN生成图片的动态网址。我需要一个可靠的方法与PHP检查图像是否真正存在于远程URL。我尝试了各种方法与不同的PHP库，curl等，但没有一个很好，其中一些是彻底缓慢。鉴于我需要为我的数据库中的每本书生成（并检查！）约60个URL，这是一个巨大的等待时间。任何线索？

I am generating dynamic URLs of images for book ISBNs. I need a reliable way with PHP to check whether the images actually exist at the remote url. I tried various approaches with different PHP libraries, curl, etc., but none of them works well, some of them are downright slow. Given the fact that I need to generate (and check!) about 60 URLS for each book in my database, this is a huge waiting time. Any clues?

推荐答案

function checkRemoteFile($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$url);
    // don't download content
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_setopt($ch, CURLOPT_FAILONERROR, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    if(curl_exec($ch)!==FALSE)
    {
        return true;
    }
    else
    {
        return false;
    }
}

- >这是最快的方法，如果你的主机支持curl

--> that is the fastest way if your host supports curl

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