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<?php $arr= [ ["test1"=>["a"=>"1"]], ["test2"=>["b"=>"2"]], ["test3"=>["c"=>"3"]], ["test4"=>["d"=>"4"]], ]; $b = call_user_func_array("array_merge",$arr); print_r($b);

This is an error 500

Value for `_results` contains invalid data `array`


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