我的javascript代码如下：
var configuration = [];
configuration["step 1"] = val1;
configuration["step 2"] = val2;
configuration["step 3"] = val3;
configuration["extraData"] = extra_data;
var data = {
action: 'configuration_save',
config: configuration,
};
$.post(ajaxurl, data, function (response) {
alert(response)
});
PHP中的$_POST['config'] 显示空白，在传递数组时我是否做错了？
PHP CODE
$current_user = wp_get_current_user();
$user_id = $current_user->ID;
add_user_meta( $user_id, "CONFIG", $_POST['config']);
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