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run code in 200+ php & hhvm versions
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<?php $input = Array( Array ( 'd1' => 'P', 'd2' => '', 'd3' => '' ), Array ( 'd1' => '', 'd2' => 'A', 'd3' => 'P' ) ); $result = call_user_func_array("array_filter(array_merge)", $input); var_export($result);
based on Y5H6D
Output for 5.6.38 - 7.3.0rc3
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'array_filter(array_merge)' not found or invalid function name in /in/nXFCC on line 17 NULL