<?php

function check_types($my_array){
    foreach ($my_array as $key => $value)
        foreach ($my_array[$key] as $key2 => $value2)
            if ($key2 != gettype($value2))
                return false
    return true;
}



$tab = ["integer"=> [5121,454, -5464],
    "double" => [22.0, 262.65, -54.54],
    "NULL"   => [NULL, NULL, NULL],
    "string" => ["a", "a", "ab"],
    "object" => [new stdClass()]];

 var_dump(check_types($tab));

 ?>