Code tự động loại bỏ ký tự tiếng Việt trong tên file khi upload ảnh lên host

/**
 * Produces cleaner filenames for uploads
 */
function ttv_sanitize_file_name( $filename ) {
    $sanitized_filename = remove_accents( $filename ); // Convert to ASCII
    // Standard replacements
    $invalid = array(
        ' '   => '-',
        '%20' => '-',
        '_'   => '-',
    );
    $sanitized_filename = str_replace( array_keys( $invalid ), array_values( $invalid ), $sanitized_filename );
    $sanitized_filename = preg_replace('/[^A-Za-z0-9-. ]/', '', $sanitized_filename); // Remove all non-alphanumeric except .
    $sanitized_filename = preg_replace('/.(?=.*.)/', '', $sanitized_filename); // Remove all but last .
    $sanitized_filename = preg_replace('/-+/', '-', $sanitized_filename); // Replace any more than one - in a row
    $sanitized_filename = str_replace('-.', '.', $sanitized_filename); // Remove last - if at the end
    $sanitized_filename = strtolower( $sanitized_filename ); // Lowercase
    return $sanitized_filename;
}
add_filter( 'sanitize_file_name', 'ttv_sanitize_file_name', 10, 1 );