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我可以用任何方式检查url是否指向有效图像（使用JS / PHP / ZendFramework）？

分类: 技术问答 • 2022-03-18 15:24:32

我可以用任何方式检查url是否指向有效图像（使用JS / PHP / ZendFramework）？

问题描述：

i am developing a test/learning app. i wonder how can i test if an image from another site/domain ... i broke up my validation logic to the following

  • exists
  • is an image
  • is of valid type
  • is of a specific dimensions
  • is below a max size - say i want the image to load quickly. tho the hosting resource is not mine.

我正在开发一个测试/学习应用程序。 我想知道如何测试来自其他网站/域的图像...我将我的验证逻辑分解为以下 p>

  • 存在 li> 是图像 li>
  • 属于有效类型 li>
  • 具有特定尺寸 li>
  • 低于最大尺寸 - 说我想要 要快速加载的图像。 托管资源不是我的。 li> ul> div>

答

getimagesize() can do all but the last of your points. For that you can use filesize(). For filesize() you'll have to actually download it though, but seeing as getimagesize() also requires that, you can just save it to a temporary file. You can use tempnam() to get a temporary file that doesn't conflict with others.

答

  1. checking if url exists:

    $handle = curl_init($url); curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE); $response = curl_exec($handle); $status = curl_getinfo($handle, CURLINFO_HTTP_CODE); if($status == 404) {//return true or whatever}

  2. is an image, is of valid type: determine if the file extension is valid, for example using

    preg_match('/(jp[e]?g|png|gif|etc...)$/i', $url);

  3. is of specific dimensions: use GD to create a resource and then check size by getImageSize($resource)

  4. is below max size: in addition to step 1 - $size = curl_getinfo($handle, CURLINFO_SIZE_DOWNLOAD);

Remember that you must have cURL and GD enabled.

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