How can checking the $_FILES['file_'.$i]['error'] value help in troubleshooting file upload issues in PHP?

Checking the $_FILES['file_'.$i]['error'] value can help in troubleshooting file upload issues in PHP because it provides information about any errors that occurred during the file upload process. By checking this value, you can determine if there was a problem with the file upload and take appropriate action, such as displaying an error message to the user or logging the error for further investigation. 

if ($_FILES['file_'.$i]['error'] !== UPLOAD_ERR_OK) {
    // Handle the file upload error
    switch ($_FILES['file_'.$i]['error']) {
        case UPLOAD_ERR_INI_SIZE:
            echo 'The uploaded file exceeds the upload_max_filesize directive in php.ini';
            break;
        case UPLOAD_ERR_FORM_SIZE:
            echo 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form';
            break;
        case UPLOAD_ERR_PARTIAL:
            echo 'The uploaded file was only partially uploaded';
            break;
        case UPLOAD_ERR_NO_FILE:
            echo 'No file was uploaded';
            break;
        case UPLOAD_ERR_NO_TMP_DIR:
            echo 'Missing a temporary folder';
            break;
        case UPLOAD_ERR_CANT_WRITE:
            echo 'Failed to write file to disk';
            break;
        case UPLOAD_ERR_EXTENSION:
            echo 'A PHP extension stopped the file upload';
            break;
        default:
            echo 'Unknown upload error';
            break;
    }
}

Keywords

$_FILES error value file upload troubleshooting PHP

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