PHP upload file can not be uploaded successfully,$_files[& #39;screenshot& #39;] [& #39;tmp_name& #39;] Tutorial for empty _php

PHP upload file can not be uploaded successfully, $_files[' screenshot ' [' Tmp_name '] is empty

Recently, in the 5th chapter of the book "Headfirst PHP & MySQL", "Using data stored in Files", a file upload application, an error occurred, that is, the file cannot be uploaded successfully. This problem has plagued me for a long time, but fortunately finally solved. The reason is that I uploaded a picture file larger than the value specified by the MAX_FILE_SIZE option in the HTML form 32768Bytes that 32KB caused the upload to succeed.

I used the XAMPP (Apache + MySQL + PHP + Perl) integration package and Zend Studio 10.6 as the PHP IDE development environment, in addition to PHP debugging I used the Xdebug, in Zend Studio10.6 Configuration I refer to the blog post Zend Studio 10.5 with XDebug debugging | Zend Debugger Description Drupal Source code (i)

The PHP code for my addscore.php is as follows:

  
 
  
   <title>Guitar Wars-add Your High Score</title>  
 
  
   
Guitar Wars-add Your High Score

 ";//echo" Score: $score
";//echo" screenshot: $screenshot
"; if (!empty ($name) &&!empty ($score) &&!empty ($screenshot)) {//Move the file to the target upload F Older $target = Gw_uploadpath.      $screenshot;            echo Json_encode ($_files); if (Move_uploaded_file ($_files[' screenshot ' [' Tmp_name '], $target)) {//Connect to the DATABASE$DBC = Mysqli_connec T (Db_host, Db_user, Db_password, db_name) or Die (' Error connecting to MySQL database! '); /Write The data to the Database$query = "INSERT into Guitarwars VALUES (0, now (), ' $name ', ' $score ', ' $screenshot ')"; MySQL I_query ($DBC, $query) or Die (' Error querying database; '); /Confirm success with the Userecho '
Thanks for adding your new high score!
'; Echo '
Name: ' . $name. '
'; Echo 'score: '. $score, Echo '
'; Echo '
<< back to high scores
';//clear the score data to clear the Form$name = ""; $score = ""; $screenshot = ""; Mysqli_close ($DBC); }} else {echo '
Please enter any of the information to add your high score.
'; }}?>
 
  
    

When I debug the above PHP code using Zend Sutdio10.6 I find "if (Move_uploaded_file ($_files[' screenshot ' [' Tmp_name '], $target)) {" The code block inside this line of code is not executed, and the value of the Super global variable $_files[' screenshot ' [' Tmp_name '] is empty, and then I print out the value of the $_files variable in JSON format before this line of code, as follows:

{"screenshot": {"name": "Penguins.jpg", "type": "", "Tmp_name": "", "Error": 2, "size": 0}}

As follows:

Then I query $_files["screenshot" [' Error '] for 2, surf the internet for a bit, about the $_files super global variables are as follows:

Common $_files system function usages in the PHP programming language are: $_files[' myFile ' [' name '] Displays the original name of the client file. $_files[the MIME type of the ' myFile ' [' type '] file, such as "Image/gif". $_files[' myFile ' [' size '] the size of the uploaded file, in bytes. $_files[' myFile ' [' tmp_name '] The temporary file name stored, usually the system default. $_files[' myFile ' [' ERROR '] The file uploads the relevant error code. The following are the meanings represented by different codes: 0; File upload succeeded. 1; The size of the system is exceeded in the file size php.ini. 2; The value specified by the File size max_file_size option is exceeded. 3; Only part of the file is uploaded. 4; No files were uploaded. 5; The upload file size is 0.

In addition, the query PHP reference manual about the Move_uploaded_file function is described below:

Example

Example #1 Uploading multiple files

 
  $error) {    if ($error = = UPLOAD_ERR_OK) {        $tmp _name = $_files["Pictures"] ["tmp_name"] [$key];        $name = $_files["Pictures" ["Name"] [$key];        Move_uploaded_file ($tmp _name, "$uploads _dir/$name");    

The reason is finally found, because I uploaded a 32768Bytes, or 32KB size of the penguins.jpg file resulting in the occurrence of $_files[' screenshot ' [' Error '] is 2 error, and $_files[' Screenshot ' [' Tmp_name '] is empty, move_uploaded_file ($_files[' screenshot ' [' Tmp_name '], $target) function call returns FALSE,IF (move_ Uploaded_file ($_files[' screenshot ' [' Tmp_name '], $target)) {
...
The code block was not executed.

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