Online PHP editor | refs for 4L0j2

<?php $allowedAttachmentTypes = '.jpeg,.gif,.png,.jpg,.bmp'; print_r( $allowedAttachmentTypes ); $allowedAttachmentTypes = explode( ',', $allowedAttachmentTypes ); array_walk( $allowedAttachmentTypes, function( $var, $index ) use ( &$allowedAttachmentTypes ) { $allowedAttachmentTypes[ $index ] = preg_replace( '#[\s\.]+#', '', $var ); } ); print_r( $allowedAttachmentTypes );