php - 超过最大文件大小不显示错误

Question

我写了一段代码，它应该检查文件大小是否超过 8.5 MB，如果超过，它应该产生错误并禁止帖子进入数据库。该代码禁止帖子进入数据库，但未显示任何错误说明文件大小超过。 (P.S:未知文件格式的检查正在工作。)这是我写的代码:

   //$session id
define ("MAX_SIZE","9000"); 
function getExtension($str)
{
         $i = strrpos($str,".");
         if (!$i) { return ""; }
         $l = strlen($str) - $i;
         $ext = substr($str,$i+1,$l);
         return $ext;
}


$valid_formats = array("jpg", "png", "gif", "bmp","jpeg");
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST") 
{

    $uploaddir = "uploads/"; //a directory inside
    foreach ($_FILES['photos']['name'] as $name => $value)
    {

        $filename = stripslashes($_FILES['photos']['name'][$name]);
        $size=filesize($_FILES['photos']['tmp_name'][$name]);
        //get the extension of the file in a lower case format
        $ext = getExtension($filename);
        $ext = strtolower($ext);

        if(in_array($ext,$valid_formats))
         {
           if ($size < (MAX_SIZE*1024))
           {
             $image_name=time().$filename;
             echo "<img src='".$uploaddir.$image_name."' class='imgList'>";
             $newname=$uploaddir.$image_name;

             if (move_uploaded_file($_FILES['photos']['tmp_name'][$name], $newname)) 
             {
               $time=time();
               mysql_query("INSERT INTO user_uploads(image_name,user_id_fk,created) VALUES('$image_name','$session_id','$time')");




           }
           else
           {
             echo '<p style="color: Red;">You have exceeded the size limit! so moving unsuccessful! </p>';
            }

           }
           else
           {
             echo '<p style="color: Red;">You have exceeded the size limit!</p>';

           }

          }
          else
         { 
            echo '<p style="color: Red;">Unknown extension!</p>';

         }

     }
}

Answer 1

我稍微修改了你的代码。

你不需要这么复杂的函数 getExtension。

我更改了 foreach，以遍历文件而不是文件的属性。

最后你需要在移动文件之前检查目录是否存在。如果没有，您应该创建它。

if(!is_dir($uploaddir)) {
    mkdir($uploaddir);
}

看看这是否有效并检查差异:

<?php
  //$session id
define ("MAX_SIZE","9000"); 
function getExtension($str)
{
         $ext = explode("/",$str);
         return $ext[1];
}


$valid_formats = array("jpg", "png", "gif", "bmp","jpeg");
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST") 
{

    $uploaddir = "uploads/"; //a directory inside
    foreach ($_FILES as $FILE)
    {

        $filename = stripslashes($FILE['name']);
        $size=$FILE['size'];
        //get the extension of the file in a lower case format
        $ext = getExtension($FILE['type']);
        $ext = strtolower($ext);

        if(in_array($ext,$valid_formats)){
           if ($size < (MAX_SIZE*1024)){
             $image_name=time().$filename;
             echo "<img src='".$uploaddir.$image_name."' class='imgList'>";
             $newname=$uploaddir.$image_name;

             //Before you upload the file to the directory, check if it exists like this
             if(!is_dir($uploaddir)) {
               mkdir($uploaddir);
             }

             if (move_uploaded_file($FILE['name'], $newname)){
               $time=time();
               mysql_query("INSERT INTO user_uploads(image_name,user_id_fk,created) VALUES('$image_name','$session_id','$time')");
             }else{
             echo '<p style="color: Red;">You have exceeded the size limit! so moving unsuccessful! </p>';
             }
           }else{
             echo '<p style="color: Red;">You have exceeded the size limit!</p>';
           }
          }else{ 
            echo '<p style="color: Red;">Unknown extension!</p>';

         }

     }
}

它终于在我的电脑上工作了，所以假设它对你有用。希望我能帮上忙