What is converting php object to array?

PHP object to array refers to the process of converting a PHP object into an associative array. In PHP, an object is an instantiation of a class, with attributes and methods, and an array is a series of key-value pairs. composed data structure. By manual conversion, using the "get_object_vars()" function or using the type conversion operator, object to array conversion can be achieved, data can be easily processed and transferred, and the readability and maintainability of the code can be improved.

The operating system of this tutorial: Windows10 system, PHP version 8.1.3, DELL G3 computer.

PHP object to array conversion refers to the process of converting a PHP object into an associative array. In PHP, objects are instantiations of classes and they have properties and methods. An array is a data structure composed of a series of key-value pairs.

In actual development, we often need to convert objects into arrays to facilitate data processing and transfer. PHP provides several methods to achieve object to array conversion.

Manual conversion:

Manual conversion is the most basic method, which can be done by traversing the properties of the object and adding the key and value of each property to a new array. This requires writing some extra code to handle the different types of properties.

For example, suppose there is a Person class with two attributes: name and age. We can use the following code to convert a Person object into an array:

class Person {
    public $name;
    public $age;
}
$person = new Person();
$person->name = "John";
$person->age = 30;
$array = array();
$array['name'] = $person->name;
$array['age'] = $person->age;

This method is more cumbersome and requires manual assignment of values ​​for each attribute. When there are many attributes, it will increase the complexity and maintenance cost of the code.

Use the get_object_vars() function:

PHP provides a built-in function get_object_vars(), which can return an object’s attributes and an associative array of attribute values. This function returns the public and protected properties of the object, but not the private properties.

For example, we can use the get_object_vars() function to convert a Person object into an array:

class Person {
    public $name;
    public $age;
}
$person = new Person();
$person->name = "John";
$person->age = 30;
$array = get_object_vars($person);

This method is more concise and does not require manually assigning values ​​​​to each attribute. Directly convert the object's properties into array key-value pairs.

Using type conversion:

PHP also provides a simple way to convert an object to an array, that is, convert an object to an array through the type conversion operator. This method converts an object's public and protected properties into an array of key-value pairs.

For example, we can convert a Person object into an array through the following code:

class Person {
    public $name;
    public $age;
}
$person = new Person();
$person->name = "John";
$person->age = 30;
$array = (array) $person;

This method is very simple, just use the type conversion operator to convert the object into an array. But it should be noted that private properties will not be converted into array key-value pairs.

To sum up, converting a PHP object to an array is the process of converting a PHP object into an associative array. We can convert objects to arrays by manual conversion, using the get_object_vars() function, or using type conversion operators. This makes it easy to process and transfer data, improving the readability and maintainability of the code.

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