How to use external parameters in the callback function of closure-PHP

Code directly. Use Case: current Code: {code ...} if: {code ...} $ gift can be passed in as the default parameter $ this-& amp; gt; gift_selector (), but how can I pass in the external variable $ customer_id? Of course, you can use the use ($ customer... directly code when closure is used. use Cases:
Current code:

$gifts = $this->get_list();$gifts = array_filter($gifts,function($v) use ($customer_id){    return call_user_func(array($this,'gift_selector'),$v,$customer_id);});

If:

$gifts = $this->get_list();$gifts = array_filter($gifts,($this,'gift_selector'));

$giftYes can be passed in as the default parameter$this->gift_selector()But external variables$customer_idHow can this problem be passed in?

Of course,closureYou can useuse ($customer_id)I know this, but I want to write the callback function here, because it is writtenclosureIt's too long.

Reply content:

Code directly. Use Cases:
Current code:

$gifts = $this->get_list();$gifts = array_filter($gifts,function($v) use ($customer_id){    return call_user_func(array($this,'gift_selector'),$v,$customer_id);});

If:

$gifts = $this->get_list();$gifts = array_filter($gifts,($this,'gift_selector'));

$giftYes can be passed in as the default parameter$this->gift_selector()But external variables$customer_idHow can this problem be passed in?

Of course,closureYou can useuse ($customer_id)I know this, but I want to write the callback function here, because it is writtenclosureIt's too long.

phpclass Demo{    private $customer_id = 0;    public function doit()    {        $gifts = array('1', '2', '3');        $this->customer_id = 3;        $gifts = array_filter($gifts, array($this,'gift_selector'));        return $gifts;    }    private function gift_selector($v)    {        return $v==$this->customer_id ? true : false;    }}$obj    = new Demo();$gifts  = $obj->doit();var_dump($gifts);/*array (size=1)  2 => string '3' (length=1)*/

Crab demon

Writing callback to pass non-parameter values can be achieved through class members like @ song XiaoBei, but I personally think this is similar to the passing status of global variables and is a bad code smell.

My suggestion is to considerget_listAdded the ability to filter by callback.

phpFunction get_list ($ filter = null) {$ gifts = []; // The original logic .. if (is_callable ($ filter) {$ gifts = array_filter ($ gifts, function ($ gift) use ($ customer_id) {return call_user_func ($ filter, $ gift, $ customer_id) ;}) ;}return $ gifts ;}

So there is

php$this->get_list([$this,'gift_selector']);

Yes, gift_selector can receive$gift, $customer_idAs a parameter

Global variables, session/cookie, reference pass value

Edit:
Class Attribute assignment
$ This-> customer_id;