How to convert object into array object in php

In PHP, we often need to convert between objects and arrays. In some cases, we may need to convert an object into an array object so that we can more conveniently operate the properties and methods of this object. In this article, we will explain how to convert an object into an array object using some built-in functions in PHP.

1. Use typecast to convert objects

Typecast (type conversion) in PHP is a method of converting one data type to another data type. Therefore, we can use typecast to convert an object into an array object. In the following example, we define an object with name, age and gender properties, and then convert the object into an array object:

class Person {
    public $name;
    public $age;
    public $gender;
}

$person = new Person();
$person->name = '张三';
$person->age = 18;
$person->gender = '男';

$array = (array) $person;
print_r($array);

Output result:

Array
(
    [name] => 张三
    [age] => 18
    [gender] => 男
)

In the above In the example, we cast the object $person into the array object $array by using (array). By printing the array object, we can see that $array successfully contains the attributes and values ​​of $person.

Please note that in the array object converted from the object, the name of the attribute is the name of the object attribute, and the value of the attribute is the value of the object attribute. However, this method cannot convert the object's private properties into array object properties. If you need to convert a private property to an array object property, use another conversion method.

2. Use the get_object_vars() function

The get_object_vars() function in PHP can be used to obtain all attributes and attribute values ​​​​of an object, and return a list consisting of attribute names and attribute values. Associative array. We can represent the return array of this function as an array object of objects. The following is an example of using the get_object_vars() function to convert an object into an array object:

class Person {
    public $name;
    public $age;
    private $gender;
}

$person = new Person();
$person->name = '张三';
$person->age = 18;
$person->gender = '男';

$array = get_object_vars($person);
print_r($array);

Output result:

Array
(
    [name] => 张三
    [age] => 18
)

In the above example, we define an object $person, which There are public properties $name and $age, and a private property $gender. We then convert this object into an array object $array using the get_object_vars() function. Please note that the get_object_vars() function only returns the public properties and values ​​of the object, excluding the private property $gender.

3. Use the json_decode() function

The json_decode() function in PHP can be used to convert a JSON format string into a PHP variable or object. When converting an object, the json_decode() function will return a stdClass object, which can be converted to an array object using typecast. The following is an example of using the json_decode() function to convert an object into an array object:

class Person {
    public $name;
    public $age;
    private $gender;
}

$person = new Person();
$person->name = '张三';
$person->age = 18;
$person->gender = '男';

$jsonStr = json_encode($person);
$array = (array) json_decode($jsonStr);
print_r($array);

Output result:

Array
(
    [name] => 张三
    [age] => 18
    [gender] => 男
)

In the above example, we first pass the object $person through json_encode() function converts it into a JSON string $jsonStr, which is then converted into a stdClass object through the json_decode() function. Finally, we use typecast to convert the stdClass object into an array object $array. Please note that using this method, the object's private properties can also be converted into array object properties.

Conclusion

PHP provides several methods to convert objects into array objects. We can choose the appropriate method according to actual needs. When using the typecast method, the object must be cast to an array object, but private properties cannot be cast to array object properties. When using the get_object_vars() function, only the public properties and values ​​of the object can be obtained. When using the json_decode() function, you can convert both the public and private properties of an object into array object properties.

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