<?php
$args = array (
'filter' => array (
'meta_query' => array (
'relation' => 'AND',
array (
'key' => 'color',
'value' => 'blue',
'compare' => '=',
),
array (
'key' => 'test',
'value' => 'testing',
'compare' => '=',
),
),
),
);
$field_string = http_build_query( $args );
echo urldecode( $field_string );
// filter[meta_query][relation]=AND&filter[meta_query][0][key]=color&filter[meta_query][0][value]=blue&filter[meta_query][0][compare]==&filter[meta_query][1][key]=test&filter[meta_query][1][value]=testing&filter[meta_query][1][compare]==
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