具有多个文件扩展名和大写的 PHP 上传表单答案

【问题标题】：PHP upload form with multiple file extensions & uppercase具有多个文件扩展名和大写的 PHP 上传表单
【发布时间】：2011-06-07 12:13:59
【问题描述】：

我的 php 上传表单正常工作（允许 .jpg），但不知道如何添加 .JPG（大写问题）或 .jpeg。

有人可以告诉我如何将这些扩展添加到以下代码中吗？

<?php
//–°heck that we have a file
if((!empty($_FILES["uploaded_file"])) && ($_FILES['uploaded_file']['error'] == 0)) {
  //Check if the file is JPEG image and it's size is less than 350Kb
  $filename = basename($_FILES['uploaded_file']['name']);
  $ext = substr($filename, strrpos($filename, '.') + 1);
  if (($ext == "jpg") && ($_FILES["uploaded_file"]["type"] == "image/jpeg") && 
    ($_FILES["uploaded_file"]["size"] < 16000000)) {
    //Determine the path to which we want to save this file
      $newname = dirname(__FILE__).'/upload/'.$filename;
      //Check if the file with the same name is already exists on the server
      if (!file_exists($newname)) {
        //Attempt to move the uploaded file to it's new place
        if ((move_uploaded_file($_FILES['uploaded_file']['tmp_name'],$newname))) {
           echo "It's done! The file has been saved!";
        } else {
           echo "Error: A problem occurred during file upload!";
        }
      } else {
         echo "Error: File ".$_FILES["uploaded_file"]["name"]." already exists";
      }
  } else {
     echo "Error: Only .jpg images under 15 Mb are accepted for upload";
  }
} else {
 echo "Error: No file uploaded";
}
?>

非常感谢您的帮助和时间！

【问题讨论】：

标签： php forms upload

【解决方案1】：

除了@Swanny，您还有更多选择：

in_array 方法（加上strtolower）：

if (in_array(strtolower($est),Array('jpg','jpeg')))

有使用strcasecmp 消除大小写：

if (strcasecmp($ext,'jpg') === 0 || strcasecmp($ext,'jpeg') === 0)

或者，好的'ol'fashioned RegEx apprach（消除了$ext变量：

if (preg_match('/\.(jpe?g)$/i',$filename))

也可以这样修改（添加由竖线（|）字符分隔的附加扩展名）

if (preg_match('/\.(jpe?g|gif|png)$/i',$filename))

【讨论】：

【解决方案2】：

您可能会将第 6 行更改为：

if (($ext == "jpg") && ($_FILES["uploaded_file"]["type"] == "image/jpeg") &&

到：

if (($ext == "jpg" || $ext == "jpeg" || $ext == "JPG") && ($_FILES["uploaded_file"]["type"] == "image/jpeg") &&

虽然如果您想进一步扩展它，我建议您使用文件类型数组并检查数组，这样更容易管理。具体使用in_array函数http://php.net/manual/en/function.in-array.php

【讨论】：

非常感谢您的帮助！你救了我这个。

【解决方案3】：

比较时将扩展名转换为小写。

$ext = strtolower($ext);

if ( ($ext == 'jpg' || $ext == 'jpeg') && ($_FILES["uploaded_file"]["type"] == "image/jpeg") && 
    ($_FILES["uploaded_file"]["size"] < 16000000)) {

【讨论】：

【解决方案4】：

试试这个。使用 strtolower() 将当前文件的扩展名转换为小写，然后使用 in_array() 检查接受的扩展名数组：

<?php
$acceptedExts = array ('jpg','jpeg');

//–check that we have a file

if((!empty($_FILES["uploaded_file"])) && ($_FILES['uploaded_file']['error'] == 0)) {
  //Check if the file is JPEG image and it's size is less than 350Kb
  $filename = basename($_FILES['uploaded_file']['name']);
  $ext = strtolower (substr($filename, strrpos($filename, '.') + 1));
  if (in_array($ext,$acceptedExts) && ($_FILES["uploaded_file"]["type"] == "image/jpeg") && 
    ($_FILES["uploaded_file"]["size"] < 16000000)) {
    //Determine the path to which we want to save this file
      $newname = dirname(__FILE__).'/upload/'.$filename;
      //Check if the file with the same name is already exists on the server
      if (!file_exists($newname)) {
        //Attempt to move the uploaded file to it's new place
        if ((move_uploaded_file($_FILES['uploaded_file']['tmp_name'],$newname))) {
           echo "It's done! The file has been saved!";
        } else {
           echo "Error: A problem occurred during file upload!";
        }
      } else {
         echo "Error: File ".$_FILES["uploaded_file"]["name"]." already exists";
      }
  } else {
     echo "Error: Only .jpg images under 15 Mb are accepted for upload";
  }
} else {
 echo "Error: No file uploaded";
}
?>

请注意，它不适用于其他图像类型，因为您仍在检查文件类型是否为 image/jpeg：

$_FILES["uploaded_file"]["type"] == "image/jpeg"

【讨论】：