How Can You Convert stdClass Objects to Specific Classes in PHP?

Type Casting and Converting stdClass Objects

In PHP, the storage system used exclusively returns stdClass objects, posing a challenge to convert them into full-fledged objects of a specific class. This article explores the feasibility of achieving this conversion.

Type Juggling for Limited Conversions

PHP's type juggling mechanism enables the conversion of stdClass objects to specific types through parenthesis casting. However, this is limited to basic types such as integer, boolean, float, string, array, and object.

Mapping and Object Cloning

To convert an stdClass object into an object of a specific class, a mapping or cloning approach is required. A mapping function can be created to translate the stdClass properties to the desired class properties. Alternatively, the __clone() method in OOP can be utilized to create an object of a different class with the same properties.

Hackish Approach: Serialization Trickery

A more unconventional method involves adapting a code snippet that converts an array to an object of a specific class. By manipulating the serialized data of the stdClass object and then unserializing it, the result is effectively an instance of the desired class. However, this approach should be used cautiously due to potential side effects.

Sample Code for Object Conversion

function objectToObject($instance, $className) {
    return unserialize(sprintf(
        'O:%d:"%s"%s',
        strlen($className),
        $className,
        strstr(strstr(serialize($instance), '"'), ':')
    ));
}

By passing the stdClass object and the desired class name as arguments, this function returns an object of the specified class.

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