How to convert php objects into arrays

In PHP, we often need to convert objects into arrays for processing or passing in different applications. Converting objects into arrays can help us manipulate data and perform data processing more conveniently. This article will introduce methods and techniques for converting PHP objects into arrays.

1. Method of converting objects into arrays

In PHP, objects can be converted into arrays through type conversion or using built-in functions.

1. Using cast type conversion

In PHP, we can use the type conversion symbol to convert an object into an array. The following are the objects that need to be converted:

class Person {
  public $name = 'Tom';
  public $age = 30;
}

$person = new Person;

Using forced type conversion, we can convert the above objects into arrays:

$array = (array) $person;

The resulting array structure is as follows:

Array (
  [name] => Tom
  [age] => 30
)

2. Use object to array function

In PHP, we can use the built-in function get_object_vars() to convert an object into an associative array. This function returns an associative array consisting of object property names and property values, with property names as keys and property values ​​as values.

The following is an example of using the get_object_vars() function to convert an object into an array:

class Person {
  public $name = 'Tom';
  public $age = 30;
}

$person = new Person;

$array = get_object_vars($person);

The resulting array structure is as follows:

Array (
  [name] => Tom
  [age] => 30
)

2. Object Tips for converting to an array

When converting an object into an array, we need to pay attention to the following points:

1. Private properties cannot be converted

If The attributes of the object are private, and the attribute value cannot be obtained using the get_object_vars() function. This is because private properties cannot be accessed outside the object. If we want to get the value of a private property, we need to use the object’s magic method __get().

2. Object methods cannot be converted

When the object is converted into an array, the object method cannot be converted. If you need to convert the function into an array, you can use the PHP built-in function get_class_methods() to get all the methods of the object, and convert the function into an array through loop traversal.

3. Numbers and Boolean variables will be coerced into integers and Boolean types

When converting an object into an array, the numeric and Boolean variables in the object properties will be Cast to integer and boolean.

The following is an example:

class Person {
  public $name = 'Tom';
  public $age = 30;
  public $isMale = true;
}

$person = new Person;

$array = (array) $person;

The obtained array structure is as follows:

Array (
  [name] => Tom
  [age] => 30
  [isMale] => 1
)

4. When there is an object in the object attribute, it can be converted recursively

If there are other objects in the object properties, we can also recursively convert them into arrays. The following is an example:

class Address {
  public $street = '123 Main St';
}

class Person {
  public $name = 'Tom';
  public $age = 30;
  public $address;

  function __construct() {
    $this->address = new Address;
  }
}

$person = new Person;

$array = (array) $person;

The resulting array structure is as follows:

Array (
  [name] => Tom
  [age] => 30
  [address] => Array (
    [street] => 123 Main St
  )
)

Summary

In PHP, we can cast the type or use the built-in function get_object_vars( ) Convert object to array. There are some techniques that need to be paid attention to during the conversion process. For example, private attributes need to be obtained through the magic method __get(). Numbers and Boolean variables will be forced to be converted into integers and Boolean types. When other objects exist in the object attributes, they can be recursed. conversion etc. Mastering the methods and techniques of converting objects into arrays can help us perform data operations and processing more conveniently.

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