PHP参数会被用作对象名

这样写也是可以的哈
$relate_model  指代对象模型

$rel_data = $relate_model::findAll([$pk_column => array_unique($_ids)]);

<?php
$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);
print_r($result);
?>



Array
(
    [a] => green
    [0] => red
    [1] => blue
)