How to convert object to array object in php

PHP is a high-level programming language that can be used to develop a variety of different types of applications. In PHP, it is often necessary to convert the obtained object into an array object. This article will introduce how to convert an object into an array object in PHP.

1. PHP Object

In PHP, an object is a special variable type, and the object contains data and methods. An object's properties contain data, and an object's methods contain the code to process that data. Objects can be used to represent various entities in the real world, such as people, cars, buildings, etc.

In PHP, we can use the keyword new to create objects. As shown in the following code:

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

$person = new Person();
$person->name = 'Tom';
$person->age = 20;

In the above code example, we created a class named Person, which defines a public property $name and a public property $age. We then create a $person object and assign the property values ​​using the arrow operator ->. Now that we have created an object, we will look at converting that object into an array object.

2. Convert PHP objects to array objects

In PHP, you can use built-in functions, such as get_object_vars(), to convert objects into arrays. This function returns an associative array of all public properties of the object. You can use a foreach loop to output it.

For example, we can use the following code to convert the $person object above into an array.

$personsArray = get_object_vars($person);
foreach ($personsArray as $key => $value) {
    echo "$key => $value\n";
}

The above code output is as follows:

name => Tom
age => 20

Another method is to use the json_decode() function to convert the object into an associative array. This function can convert a JSON string to a PHP object or an associative array, so we can use this function to convert an object to an associative array.

For example, we can use the following code to convert the $person object above into an array.

$json = json_encode($person);
$array = json_decode($json, true);

print_r($array);

The above code output is as follows:

Array
(
    [name] => Tom
    [age] => 20
)

3. Convert PHP object to array object (including private properties)

If the object contains private properties, we cannot use get_object_vars () function to obtain private property values. However, we can use the Reflection API to get the value of a private property.

Reflection API is a reflection tool for PHP, used to retrieve information about classes, methods, properties, parameters, etc.

For example, the following is a Person class that contains private properties.

class Person{
    public $name;
    protected $age;
    private $email;

    public function __construct($name, $age, $email){
        $this->name = $name;
        $this->age = $age;
        $this->email = $email;
    }
}

In the above example, the $email attribute is marked as private. Therefore, the get_object_vars() function cannot be used to obtain the value of the $email attribute. However, we can use the Reflection API to get the value of a private property.

The following is a sample code that uses the Reflection API to convert the above $person object into an array.

function objectToArray($object)
{
    $reflectionClass = new ReflectionClass(get_class($object));
    $array = array();
    foreach ($reflectionClass->getProperties() as $property) {
        $property->setAccessible(true);
        $array[$property->getName()] = $property->getValue($object);
    }
    return $array;
}

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

The above code uses the methods of ReflectionClass and ReflectionProperty classes to obtain the values ​​of all properties and private properties of the class. Private properties can be accessed using ReflectionProperty's setAccessible(true) method. Finally, the function returns an array object.

4. Conclusion

In PHP, we can use the get_object_vars() function to convert objects into array objects. However, if the object contains private properties, we cannot use this function to get the value of the private property. In this case, we can use Reflection API to get the value of the private property and convert the object into an array object.

In general, converting objects into arrays is a very common requirement in PHP programming. Developers can choose the appropriate method based on specific scenarios.

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