// UPLOAD_ERR_OK         Value: 0
// There is no error, the file uploaded with success.
 
// UPLOAD_ERR_INI_SIZE   Value: 1
// The uploaded file exceeds the upload_max_filesize directive in php.ini.
 
// UPLOAD_ERR_FORM_SIZE  Value: 2
// The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.
 
// UPLOAD_ERR_PARTIAL    Value: 3
// The uploaded file was only partially uploaded.
 
// UPLOAD_ERR_NO_FILE    Value: 4
// No file was uploaded.
 
// UPLOAD_ERR_NO_TMP_DIR Value: 6
// Missing a temporary folder. Introduced in PHP 4.3.10 and PHP 5.0.3.
 
// UPLOAD_ERR_CANT_WRITE Value: 7
// Failed to write file to disk. Introduced in PHP 5.1.0.
 
// UPLOAD_ERR_EXTENSION  Value: 8
// A PHP extension stopped the file upload. Introduced in PHP 5.2.0.

<?php
error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', 1);
 
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $name     = $_FILES['myfile']['name'];
    $type     = $_FILES['myfile']['type'];
    $tmp_name = $_FILES['myfile']['tmp_name'];
    $error    = $_FILES['myfile']['error'];
    $size     = $_FILES['myfile']['size'];
 
    switch ($error) {
        case UPLOAD_ERR_OK:
            $response = 'There is no error, the file uploaded with success.';
            break;
        case UPLOAD_ERR_INI_SIZE:
            $response = 'The uploaded file exceeds the upload_max_filesize directive in php.ini.';
            break;
        case UPLOAD_ERR_FORM_SIZE:
            $response = 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.';
            break;
        case UPLOAD_ERR_PARTIAL:
            $response = 'The uploaded file was only partially uploaded.';
            break;
        case UPLOAD_ERR_NO_FILE:
            $response = 'No file was uploaded.';
            break;
        case UPLOAD_ERR_NO_TMP_DIR:
            $response = 'Missing a temporary folder. Introduced in PHP 4.3.10 and PHP 5.0.3.';
            break;
        case UPLOAD_ERR_CANT_WRITE:
            $response = 'Failed to write file to disk. Introduced in PHP 5.1.0.';
            break;
        case UPLOAD_ERR_EXTENSION:
            $response = 'File upload stopped by extension. Introduced in PHP 5.2.0.';
            break;
        default:
            $response = 'Unknown upload error';
            break;
    }
 
    echo $response;
}
else {
    echo
        '<form action="upload.php" enctype="multipart/form-data" method="post">' .
            '<input name="myfile" type="file" /><br />' .
            '<input type="submit" value="Submit" />' .
        '</form>' .
        '';
}