How to convert obj into array in php

In PHP development, sometimes it is necessary to convert an object into an array to facilitate data transfer and processing. This article introduces how to convert objects into arrays in PHP.

1. Use the get_object_vars function for conversion

PHP’s built-in function get_object_vars can obtain the array representation of all visible attributes in the object (the key is the attribute name and the value is the attribute value). We can convert it The returned array is used directly as the required array.

Sample code:

class Car {
    public $brand = 'Audi';
    public $model = 'A6';
    private $price = 80000;
    
    public function __construct()
    {
        # code...
    }
}

$car = new Car();
$arr = get_object_vars($car);
print_r($arr);

Execution result:

Array
(
    [brand] => Audi
    [model] => A6
)

It can be seen that since the $price property is private, it will not appear in the returned array.

2. Use the json_decode function for conversion

We can use the PHP built-in function json_decode to convert the object into a string in JSON format, and then convert it into an array.

Sample code:

class Car {
    public $brand = 'Audi';
    public $model = 'A6';
    private $price = 80000;
    
    public function __construct()
    {
        # code...
    }
}

$car = new Car();
$jsonStr = json_encode($car);
$arr = json_decode($jsonStr, true);
print_r($arr);

Execution result:

Array
(
    [brand] => Audi
    [model] => A6
)

Similarly, since the $price property is private, it will not appear in the converted array.

3. Use type cast for conversion

In PHP, in addition to using the get_object_vars function and json_decode function to convert objects into arrays, you can also use cast for conversion. We can coerce the object into an array type. The keys in the returned array are the property names and the values ​​are the property values.

Sample code:

class Car {
    public $brand = 'Audi';
    public $model = 'A6';
    private $price = 80000;
    
    public function __construct()
    {
        # code...
    }
}

$car = new Car();
$arr = (array) $car;
print_r($arr);

Execution result:

Array
(
    [brand] => Audi
    [model] => A6
    [*price] => 80000
)

It can be seen that, unlike the conversion results of the get_object_vars function and the json_decode function, in the array after forced type conversion, In addition to public properties, private properties are also included, and are marked with * to indicate private properties.

It should be noted that if there is a __toString method in the object, when the object is cast to an array, the return value of the __toString method will be used as the first element of the array (the key is 0 and the value is the return value ).

4. Use reflection for transformation

PHP’s reflection mechanism can analyze and call classes, objects and methods. Reflection provides the function of obtaining the properties and methods of objects. Through reflection classes, we You can get the object's properties and access level (public, private or protected).

Sample code:

class Car {
    public $brand = 'Audi';
    public $model = 'A6';
    private $price = 80000;
    
    public function __construct()
    {
        # code...
    }
}

$car = new Car();
$reflection = new ReflectionObject($car);
$arr = [];

foreach ($reflection->getProperties() as $property) {
    $property->setAccessible(true);
    $arr[$property->getName()] = $property->getValue($car);
}

print_r($arr);

Execution result:

Array
(
    [brand] => Audi
    [model] => A6
    [price] => 80000
)

It can be seen that when obtaining object properties through reflection, it is not restricted by the access level (public, private or protected) , at the same time, the obtained attribute names and attribute values ​​are included in the array.

To sum up, this article introduces various methods of converting objects into arrays in PHP. In actual development, which method to choose should be based on the requirements and the actual situation of the code.

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