How to convert object into array in php

In PHP, objects and arrays are two different data types. However, in some cases, we need to convert the object into an array for other operations. In this article, we will explore how to convert objects into arrays in PHP.

1. Original method in PHP

PHP provides a function get_object_vars() for returning the properties of the object. This function will return an associative array, the keys of the array are the property names of the object, and the values ​​of the array are the values ​​of the properties. The following is a sample code:

class myClass {
  public $name = 'Jenny';
  private $age = 25;
}

$obj = new myClass();
$array = get_object_vars($obj);
print_r($array);

Output:

Array
(
  [name] => Jenny
)

With this method, we can obtain the public properties of an object, but cannot obtain them if they are private properties. So if we want to get all the properties of an object, we need to change the class definition to the following form:

class myClass {
  public $name = 'Jenny';
  private $age = 25;

  public function toArray() {
    return get_object_vars($this);
  }
}

$obj = new myClass();
$array = $obj->toArray();
print_r($array);

Output:

Array
(
  [name] => Jenny
  [age] => 25
)

With this method, we can get all the properties of an object Properties, including private properties.

2. Use serialization and deserialization methods

Another way to convert an object into an array is to use PHP's serialization and deserialization functions. The serialize function serializes an object into a string, while the unserialize function converts a string back into an object. In this way we can convert the object into an array.

The following is a sample code:

class myClass {
  public $name = 'Jenny';
  private $age = 25;
}

$obj = new myClass();
$serialize = serialize($obj);
$array = unserialize($serialize);
print_r($array);

Output:

myClass Object
(
  [name] => Jenny
  [age:myClass:private] => 25
)

We can see that this method converts the object into an array containing object information. If we only need the property values ​​of the object, further processing of the array is required. The following is a modified sample code:

class myClass {
  public $name = 'Jenny';
  private $age = 25;

  public function toArray() {
    $serialized = serialize($this);
    $array = unserialize($serialized);
    return get_object_vars($array);
  }
}

$obj = new myClass();
$array = $obj->toArray();
print_r($array);

Output:

Array
(
  [name] => Jenny
  [age] => 25
)

With this method, we can quickly convert the object into an array and obtain the object's property values.

3. Use the json_encode and json_decode methods

Another way to convert an object into an array is to use the json_encode and json_decode methods in PHP. json_encode converts objects into JSON format, while json_decode converts JSON-formatted strings back into arrays.

The following is a sample code:

class myClass {
  public $name = 'Jenny';
  private $age = 25;
}

$obj = new myClass();
$json = json_encode($obj);
$array = json_decode($json, true);
print_r($array);

Output:

Array
(
  [name] => Jenny
  [age] => 25
)

We can see that this method quickly converts the object into an array and obtains the object's attribute value.

In summary, we have introduced several methods to convert objects in PHP into arrays. Each of these methods has its own advantages and disadvantages, and choosing the appropriate method depends on the specific application scenario. No matter which method you use, you need to have a deep understanding of the difference between PHP objects and arrays in order to implement your code logic correctly.

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