How to convert php array objects to each other

In PHP programming, arrays and objects are the two most commonly used data types. During the development process, we often need to convert arrays to objects or objects to arrays in order to transfer or operate data.

For example, we may need to convert data queried from a database into an array or object for manipulation in our PHP application. Likewise, we may need to convert user-submitted data into objects or arrays for processing and storage within the application.

In this article, we will learn how to convert between arrays and objects in PHP. Specifically, we'll see how to convert PHP arrays to objects, and PHP objects to arrays. let's start!

Convert PHP Array to Object

Converting PHP Array to Object is very simple. PHP provides a built-in class stdClass that can be used to create empty objects. In this example, we will create a stdClass object and convert the key-value pairs in the array into the object's properties and property values.

Example 1: Convert PHP array to object

// 创建一个数组
$array = array(
    'name' => 'John Doe',
    'email' => 'john.doe@example.com',
    'phone' => '123-456-7890'
);

// 转换为对象
$obj = (object) $array;

// 打印对象
print_r($obj);

Output:

stdClass Object
(
    [name] => John Doe
    [email] => john.doe@example.com
    [phone] => 123-456-7890
)

In the above example, we used PHP cast to convert the array to object. When using type casting, PHP assigns each key-value pair in the array to a property and property value of the new object. In our example, each property name matches the key name, and the value of each property is the corresponding value in the array.

If you need more detailed control over the properties, you can also manually create the object and add the key-value pairs from the array to it. Here is an example:

Example 2: Manually convert PHP array to object

// 创建对象
$obj = new stdClass();

// 添加属性
$obj->name = 'John Doe';
$obj->email = 'john.doe@example.com';
$obj->phone = '123-456-7890';

// 打印对象
print_r($obj);

Output:

stdClass Object
(
    [name] => John Doe
    [email] => john.doe@example.com
    [phone] => 123-456-7890
)

In the above example, we first manually created a stdClass object, and then added three properties to it. Property names and property values ​​come directly from our array.

Convert PHP Object to Array

Contrary to converting PHP Array to Object, converting PHP Object to Array requires some extra effort. We can use PHP's type conversion mechanism to convert the object to an array, but in most cases this will not produce the results we expect.

So we will write a custom function to convert the object to an array. This function can recursively iterate through the object and add the object properties to the result array when it is found. Additionally, our function handles nested objects within object properties in order to correctly convert them into multidimensional arrays.

Here is an example function that converts a PHP object to an array:

Example 3: Convert a PHP object to an array

function objectToArray($obj) {
    if (is_object($obj)) {
        $obj = (array) $obj;
    }
    if (is_array($obj)) {
        $new = array();
        foreach ($obj as $key => $val) {
            $new[$key] = objectToArray($val);
        }
    } else {
        $new = $obj;
    }
    return $new;
}

// 创建一个对象
$obj = new stdClass();
$obj->name = 'John Doe';
$obj->email = 'john.doe@example.com';
$obj->phone = '123-456-7890';
$obj->address = new stdClass();
$obj->address->street = '123 Main St';
$obj->address->city = 'Anytown';
$obj->address->state = 'CA';

// 转换为数组
$array = objectToArray($obj);

// 打印数组
print_r($array);

Output:

Array
(
    [name] => John Doe
    [email] => john.doe@example.com
    [phone] => 123-456-7890
    [address] => Array
        (
            [street] => 123 Main St
            [city] => Anytown
            [state] => CA
        )

)

In the above example, we first create a stdClass object. Objects have a simple structure containing multiple nested properties. We then use our custom function objectToArray() to convert the object to an array. This function recursively traverses the object and copies its properties into an array. When a nested object is encountered, the function simply calls itself recursively to convert it to an array.

Conclusion

In PHP programming, you may often need to convert an array to an object or an object to an array. By using PHP's built-in functions and custom functions, we can easily convert between them. In addition, in actual projects, we usually use more complex object and array structures, but based on the introduction in this article, you can further expand and apply them according to your needs and actual conditions.

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