How to convert object into array in php

In PHP development, we often need to convert between objects and arrays. Common application scenarios require converting objects into arrays. PHP provides many methods to complete this conversion process, the most commonly used method is to convert the object into an array through a caster.

In PHP, when we convert an object into an array, the object's attribute name is automatically used as the key name, and the attribute value is stored in the array as the key value. At the same time, PHP can also selectively convert the private, protected, and public properties of an object.

Let’s learn how to convert objects into arrays through examples:

class BlogPost {
    private $title;
    private $content;
    protected $publishedAt;

    public function __construct($title, $content) {
        $this->title = $title;
        $this->content = $content;
        $this->publishedAt = date('Y-m-d H:i:s');
    }
}

$post = new BlogPost('PHP Object Convert Array', 'PHP 中对象转换数组的实现');
$array_post = (array) $post; // 将对象转换为数组
print_r($array_post);

In the above example, we defined a BlogPost class, which has three attributes: title, content, and publishedAt. Among them, title and content are private properties, and publishedAt is a protected property. In the constructor of the class, we set the $title and $content properties, and by default the $publishedAt property is set to the current time.

Next, we instantiate the BlogPost class and cast it to an array $array_post. Finally, we use the print_r function to print the contents of the $array_post array. You can see the output as follows:

Array
(
    [BlogPosttitle] => PHP Object Convert Array
    [BlogPostcontent] => PHP 中对象转换数组的实现
    [*publishedAt] => 2021-09-14 15:10:34
)

You can find that when we use (array ) When performing type conversion, the object's attribute name will be prefixed with the class name. This is because in PHP, the same attribute name can only appear once. In order to prevent attribute name conflicts, PHP automatically adds the class name as a prefix. At the same time, we can also access the properties of the object through arrays, such as echo $array_post['BlogPosttitle']; which can output PHP Object Convert Array.

It should be noted that when there are private properties and protected properties in the object, they are inaccessible by default after being converted to an array, but if we want to add them to the array, we can passReflectionClass class to implement:

class BlogPost {
    private $title;
    private $content;
    protected $publishedAt;

    public function __construct($title, $content) {
        $this->title = $title;
        $this->content = $content;
        $this->publishedAt = date('Y-m-d H:i:s');
    }
}

$post = new BlogPost('PHP Object Convert Array', 'PHP 中对象转换数组的实现');

$reflection_class = new ReflectionClass($post);
$properties = $reflection_class->getProperties(ReflectionProperty::IS_PUBLIC | ReflectionProperty::IS_PROTECTED | ReflectionProperty::IS_PRIVATE); // 获取所有属性

$array_post = [];
foreach ($properties as $property) {
    $property->setAccessible(true); // 设置属性可访问
    $array_post[$property->getName()] = $property->getValue($post); // 将属性及属性值添加到数组中
}

print_r($array_post);

In the above example, we used the ReflectionClass and ReflectionProperty classes to get all properties of the object, including public properties , protected properties and private properties. Then set the attribute to be accessible through the setAccessible() method, and finally add the attribute and attribute value to the array. The output result is as follows:

Array
(
    [title] => PHP Object Convert Array
    [content] => PHP 中对象转换数组的实现
    [publishedAt] => 2021-09-14 15:10:34
)

In summary, PHP provides a variety of ways to The common way to convert an object into an array is to use the cast operator (array). At the same time, we can also selectively add private properties and protected properties to the array, which can be achieved through the ReflectionClass class. No matter which method is used, you can easily convert objects into arrays for better processing and passing of object data.

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