How can developers access and display error messages for file uploads in PHP?

When developers are working with file uploads in PHP, it is important to provide error messages to users if something goes wrong during the upload process. This can help users understand why their file was not uploaded successfully. To display error messages for file uploads in PHP, developers can utilize the $_FILES superglobal array to check for errors and then display appropriate messages based on the error code. 

if ($_FILES['file']['error'] > 0) {
    switch ($_FILES['file']['error']) {
        case 1:
            echo 'The uploaded file exceeds the upload_max_filesize directive in php.ini.';
            break;
        case 2:
            echo 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form.';
            break;
        case 3:
            echo 'The uploaded file was only partially uploaded.';
            break;
        case 4:
            echo 'No file was uploaded.';
            break;
        case 6:
            echo 'Missing a temporary folder.';
            break;
        case 7:
            echo 'Failed to write file to disk.';
            break;
        case 8:
            echo 'A PHP extension stopped the file upload.';
            break;
        default:
            echo 'Unknown error occurred.';
            break;
    }
}

Keywords

file uploads error messages PHP $_FILES move_uploaded_file

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