如何只允许在 php 中上传某些文件类型?

问题描述

我正在制作一个用户上传文件的页面.如果文件类型是其他 jpg、gif 和 pdf，我想要一个 if 语句来创建一个 $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';
}

我在构建 if 语句时遇到了困难.怎么说呢?

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

推荐答案

将允许的类型放入一个数组中并使用 <代码>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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