are not in JPEG format. Author: Rich Collier Version: 1.0 Author URI: http://rcollier.me/ */ class rdc_allow_only_jpeg { function __construct() { add_filter( 'wp_handle_upload', array( $this, 'filter__wp_handle_upload' ) ); } function filter__wp_handle_upload( $args ) { if ( 'image/jpeg' != $args['type'] ) { echo '

Sorry, only JPEG files are allowed.

'; die(); } return $args; } } $rdc_allow_only_jpeg = new rdc_allow_only_jpeg(); // omit