我怎样才能只允许某些文件类型在php中上传? [英] How can I only allow certain filetypes on upload in php?

问题描述

我正在创建一个页面，供用户上传文件.如果文件类型是其他jpg，gif和pdf，我希望使用if语句创建一个$ error变量.

I'm making a page where the user upload a file. I want an if statement to create an $error variable if the file type is anything other jpg, gif, and pdf.

这是我的代码:

$file_type = $_FILES['foreign_character_upload']['type']; //returns the mimetype

if(/*$file_type is anything other than jpg, gif, or pdf*/) {
  $error_message = 'Only jpg, gif, and pdf files are allowed.';
  $error = 'yes';
}

我在构造if语句时遇到困难.我怎么说呢?

I'm having difficulty structuring the if statement. How would I say that?

推荐答案

将允许的类型放入数组中，并使用 in_array() .

Put the allowed types in an array and use in_array().

$file_type = $_FILES['foreign_character_upload']['type']; //returns the mimetype

$allowed = array("image/jpeg", "image/gif", "application/pdf");
if(!in_array($file_type, $allowed)) {
  $error_message = 'Only jpg, gif, and pdf files are allowed.';
  $error = 'yes';
}

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