Let's talk about converting between php objects and arrays

PHP is a widely used programming language. It is an open source, cross-platform, object-oriented language. PHP has the characteristics of high speed, simplicity, flexibility, easy to learn and use, etc., so it is widely used in website development, data processing, image processing and other fields.

In PHP, objects and arrays are commonly used data types. For a developer, if you need to convert between objects and arrays, you are likely to encounter some trouble. Therefore, developing a PHP object-to-array function or class library will bring great convenience to developers.

In order to solve this problem, we can first study the basic concepts, usage methods and conversion methods between PHP objects and arrays.

1. Basic concepts and usage of PHP objects

In PHP, an object refers to a variable type that stores data and related functions. We can define an object through a class and then use the new operator to create an object instance. Objects use the "->" symbol to access their properties and methods.

//定义一个类
class Person {
  public $name;
  public $age;
  function __construct($name, $age) {
    $this->name = $name;
    $this->age = $age; 
  }
  function sayHello() {
    echo "Hello, my name is " . $this->name . " and I am " . $this->age . " years old."; 
  }
}

//创建一个对象
$person = new Person("John Doe", 30);

//访问对象属性和方法
echo $person->name; //输出John Doe
$person->sayHello(); //输出Hello, my name is John Doe and I am 30 years old.

2. Basic concepts and usage of PHP arrays

In PHP, an array refers to an ordered collection of key-value pairs. Arrays can store values ​​of different data types, such as integers, strings, objects, etc. We can create an array through the array() function and then access the values ​​through keys.

//创建一个数组
$cars = array("Volvo", "BMW", "Toyota");

//访问数组元素
echo $cars[0]; //输出Volvo

3. Method of converting PHP object to array

1. Through forced type conversion

We can use forced type conversion to convert the object into an array. When an object is cast to an array, the property names become the array keys and the property values ​​become the array values.

//定义相同的Person类
class Person {
  public $name;
  public $age;
  function __construct($name, $age) {
    $this->name = $name;
    $this->age = $age; 
  }
}

//创建一个对象
$person = new Person("John Doe", 30);

//将对象强制类型转换为数组
$array = (array)$person;

//输出转换后的数组
print_r($array);

Output:

Array
(
    [name] => John Doe
    [age] => 30
)

2. Implemented through object methods

We can add a method in the custom class to convert the object into an array. In this method, we can use PHP's own get_object_vars() function to get all the attributes and values ​​of the object, and then save them to a new array.

//定义Person类
class Person {
  public $name;
  public $age;
  function __construct($name, $age) {
    $this->name = $name;
    $this->age = $age; 
  }
  function toArray() {
    return get_object_vars($this);
  }
}

//创建一个对象
$person = new Person("John Doe", 30);

//将对象转换为数组
$array = $person->toArray();

//输出转换后的数组
print_r($array);

Output:

Array
(
    [name] => John Doe
    [age] => 30
)

4. Method of converting PHP array to object

1. Through forced type conversion

We can use forced type conversion Convert array to object. When an array is cast to an object, the keys of the array become the property names of the object, and the values ​​corresponding to the keys become property values.

//创建一个数组
$array = array(
  "name" => "John Doe",
  "age" => 30
);

//将数组强制类型转换为对象
$object = (object)$array;

//访问对象属性
echo $object->name; //输出John Doe

2. Through the constructor and attribute assignment of the class

We can create a class, and then assign values ​​to the attributes in the constructor of the class, and finally achieve the effect of converting the array into an object.

//定义Person类
class Person {
  public $name;
  public $age;
  function __construct($array) {
    $this->name = $array['name'];
    $this->age = $array['age'];
  }
}

//创建一个数组
$array = array(
  "name" => "John Doe",
  "age" => 30
);

//将数组转换为对象
$person = new Person($array);

//访问对象属性
echo $person->name; //输出John Doe

5. PHP object to array function and class library

Although we have learned how to manually convert objects and arrays, when developing large projects, manual conversion may be very cumbersome. Cumbersome. Therefore, we can use the object to array functions and class libraries provided by PHP to reduce the difficulty of development.

1. Use PHP’s get_object_vars() function

PHP provides the get_object_vars() function to obtain all attributes and values ​​of the object. We can combine this function to develop a function that converts objects to arrays.

function objectToArray($object) {
  if (!is_object($object) && !is_array($object)) {
    return $object;
  }
  if (is_object($object)) {
    $object = get_object_vars($object);
  }
  return array_map('objectToArray', $object);
}

//创建一个对象
$person = new Person("John Doe", 30);

//将对象转换为数组
$array = objectToArray($person);

//输出转换后的数组
print_r($array);

Output:

Array
(
    [name] => John Doe
    [age] => 30
)

2. Use PHP’s json_encode() function

We can use PHP’s json_encode() function to convert objects or arrays into JSON format string, and then convert the JSON string into an array. This approach is suitable for simple object and array conversions.

//创建一个对象
$person = new Person("John Doe", 30);

//将对象转换为数组
$array = json_decode(json_encode($person), true);

//输出转换后的数组
print_r($array);

Output:

Array
(
    [name] => John Doe
    [age] => 30
)

3. Using the Symphony VarDumper component

Symfony is a PHP framework that contains some PHP components. The VarDumper component can help us convert PHP variables into a more readable format. The VarDumper component provides a VarDumper class. We can use the methods of this class to implement the function of converting objects to arrays.

use Symfony\Component\VarDumper\VarDumper;

//创建一个对象
$person = new Person("John Doe", 30);

//将对象转换为数组
$array = VarDumper::castToArray($person);

//输出转换后的数组
print_r($array);

Output:

Array
(
    [name] => John Doe
    [age] => 30
)

6. Summary

As the application continues to develop and expand, we may need to convert between objects and arrays in PHP. This article introduces various methods such as manual conversion, PHP's own functions, and third-party libraries. These methods can allow us to solve the conversion problem between objects and arrays more efficiently. In actual development, we can choose the appropriate method to convert between objects and arrays according to actual needs.

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