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Handling file upload errors

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The $_FILES["FILE_NAME"]['error'] (where "FILE_NAME" is the value of the name attribute of the file input, present in your form) might contain one of the following values:

  1. UPLOAD_ERR_OK - There is no error, the file uploaded with success.
  2. UPLOAD_ERR_INI_SIZE - The uploaded file exceeds the upload_max_filesize directive in php.ini.
  3. UPLOAD_ERR_PARTIAL - The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.
  4. UPLOAD_ERR_NO_FILE - No file was uploaded.
  5. UPLOAD_ERR_NO_TMP_DIR - Missing a temporary folder. (From PHP 5.0.3).
  6. UPLOAD_ERR_CANT_WRITE - Failed to write file to disk. (From PHP 5.1.0).
  7. UPLOAD_ERR_EXTENSION - A PHP extension stopped the file upload. (From PHP 5.2.0).

An basic way to check for the errors, is as follows: 

<?php
$fileError = $_FILES["FILE_NAME"]["error"]; // where FILE_NAME is the name attribute of the file input in your form
switch($fileError) {
    case UPLOAD_ERR_INI_SIZE:
        // Exceeds max size in php.ini
        break;
    case UPLOAD_ERR_PARTIAL:
        // Exceeds max size in html form
        break;
    case UPLOAD_ERR_NO_FILE:
        // No file was uploaded
        break;
    case UPLOAD_ERR_NO_TMP_DIR:
        // No /tmp dir to write to
        break;
    case UPLOAD_ERR_CANT_WRITE:
        // Error writing to disk
        break;
    default:
        // No error was faced! Phew!
        break;
}
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Reading request data:
* Reading Request Data
* Reading raw POST data
* Reading POST data
* Reading GET data
* Passing arrays by POST
* Handling file upload errors
* Uploading files with HTTP PUT
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