<?php $products = ['canvas']; $availableSizes = ['8x10', '10x10']; $materials = ["matte", "luster"]; var_export( array_merge(...array_map( fn($product) => array_merge(...array_map( fn($size) => array_map( fn($material) => implode('_', [$product, $size, $material]), $materials ), $availableSizes )), $products )) );
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