A detailed description of late static binding in Laravel
Regarding PHP's new static delayed static binding, or late static binding, I encountered a usage problem in Laravel. This article mainly introduces a brief discussion of a late static binding in Laravel. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.
As follows, when calling the Model in Laravel to add new data, first add a method to the Model to obtain the sub-table:
protected function addToMessage($msgType, $userID, $commentID, $replyCommentID, $replyUserID, $gameID)
{
if (!$userID) {
return false;
}
$table = 't_message_' . hashID($userID, 100);
$this->message->setTable($table)->create([
'msg_type' => $msgType,
'user_id' => $userID,
'comment_id' => $commentID,
'reply_comment_id' => $replyCommentID,
'reply_user_id' => $replyUserID,
'game_id' => $gameID,
'is_read' => 0,
'created_at' => date('Y-m-d H:i:s'),
]);
return true;
}Here is the setTable method It is the method defined in the Model to obtain the sub-table:
public function setTable($table)
{
$this->table = $table;
return $this;
}It was found from the error log that $this->table did not take effect, but the create method was actually called. When the table name was printed before, it was the expected value. Why is $this->table not reset when the create method is called here?
Here $this->message is a model class that inherits the Model class, where the create method:
##
public static function create(array $attributes = [])
{
$model = new static($attributes);
$model->save();
return $model;
}
Experiment
An abstract class A has a create method, which is instantiated and returned through delayed static binding. Class B inherits A, and the name attribute of the parent class is modified in the test method.<?php
abstract class A
{
protected $name = "tanteng";
public static function create()
{
return new static();
}
}
class B extends A
{
//protected $name = '纸牌屋弗兰克';
public function test()
{
$this->name = "Tony Tan";
return $this;
}
}
$obj1 = (new B)->test();
$obj2 = (new B)->test()->create();
var_dump($obj1);
var_dump($obj2);Detailed explanation of the definition and usage examples of post-static binding in php
php delayed static binding What is it? Detailed explanation of delayed static binding example code
PHP Static delayed static binding usage analysis
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