{"id":9718,"date":"2021-03-22T11:00:59","date_gmt":"2021-03-22T02:00:59","guid":{"rendered":"https:\/\/www.gigas-jp.com\/appnews\/?p=9718"},"modified":"2021-03-22T11:52:30","modified_gmt":"2021-03-22T02:52:30","slug":"magic-methods-in-php-part-2","status":"publish","type":"post","link":"https:\/\/www.gigas-jp.com\/appnews\/archives\/9718","title":{"rendered":"Magic methods in PHP – Part 2"},"content":{"rendered":"\n

I will continue to talk about magic methods article I wrote last week. For the part 1, you can read here<\/a>.<\/p>\n\n\n\n

ToString<\/p>\n\n\n\n

The magic __toString () method allows you to define what you would like to display when an object of the class is treated as a string. If you use echo or print on your object, and you haven’t defined the __toString () method, it will give an error.<\/p>\n\n\n\n

<?php\nclass Student {\n    private $name;\n \n    public function __construct($name) \n    {\n        $this->name = $name;\n        $this->email = $email;\n    }\n \n    public function __toString()\n    {\n        return 'Name: '.$this->name;\n    }\n}\n \n$student = new Student('Yuuma');\necho $student;\n?><\/code><\/pre>\n\n\n\n
Call<\/p>\n\n\n\n
If the __get () and __set () methods are called for non-existent properties, the __call () method is called when trying to invoke inaccessible methods, the methods that have not been defined in your class.<\/p>\n\n\n\n
<?php\nclass Student {\n    public function __call($methodName, $arg) \n    {\n        \/\/ $methodName = getName\n        \/\/ $arg = array('1')\n    }\n}\n \n$student = new Student();\n$student->getName(1);\n?><\/code><\/pre>\n\n\n\n
Isset<\/p>\n\n\n\n
The magic __isset () method is called when you call the isset () method on inaccessible or non-existent object properties. Let’s see how it works with an example.<\/p>\n\n\n\n
<?php\nclass Student {\n    private $data = array();\n \n    public function __isset($name) \n    {\n        return isset($this->data[$name]);\n    }\n}\n \n$student = new Student();\necho isset($student->email);\n?><\/code><\/pre>\n\n\n\n
Invoke<\/p>\n\n\n\n
The magic __invoke () method is a special method that is called when you try to call an object as if it were a function. the $student object is treated as if it were a function, and since we have defined the __invoke () method, it will be called instead of giving you an error. The main purpose of the __invoke () method is that if you want to treat your objects as callable, you can implement this method.<\/p>\n\n\n\n
<?php\nclass Student {\n    private $name;\n \n    public function __construct($name) \n    {\n        $this->name = $name;\n    }\n \n    public function __invoke()\n    {\n        echo 'Invoke function';\n    }\n}\n \n$student = new Student('John');\n$student();\n?><\/code><\/pre>\n\n\n\n
There are still some magic methods in PHP but let me stop here as I had written most used methods in article part 1 and part 2. If you are interest for more, you can check it out in PHP official documentation<\/a>.<\/p>\n\n\n\n
Yuuma<\/p>\n
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<\/g:plusone><\/div>\n            
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