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run code in 200+ php & hhvm versions
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<?php echo urldecode(http_build_query([ "filter" => [ "type" => "all", "conditions" => [ ["column" => "price", "comparator" => "equals", "value" => 120, "type" => "number"] ] ] ]));
based on l7ATf
Output for 5.6.0 - 7.3.0rc3
filter[type]=all&filter[conditions][0][column]=price&filter[conditions][0][comparator]=equals&filter[conditions][0][value]=120&filter[conditions][0][type]=number