<?php $walk = function( $item, $key, $parent_key = '' ) use ( &$output, &$walk ) { is_array( $item ) ? array_walk( $item, $walk, $key ) : $output[] = http_build_query( array( $parent_key ?: $key => $item ) ); }; $array = array( 'order_source' => array('google','facebook'), 'order_medium' => 'google-text' ); array_walk( $array, $walk ); echo implode( '&', $output ); // order_source=google&order_source=facebook&order_medium=google-text
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