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