stdClass.php

<?PHP
/****
 * stdClass Inheritance Failure
 * ================================================================================
 *    
 *    This example shows how stdClass is not inherited in classes definitions that
 *    do not explicit it. 
 *    
 */

class InstableDefinition {}
class StableDefinition extends stdClass {}
class AnotherInstableDefinition extends InstableDefinition {}
class AnotherStableDefinition extends StableDefinition {}

$Objects =
[
   'First Instable Object' => new InstableDefinition,
   'First Stable Object' => new StableDefinition,
   'Another Instable Object' => new AnotherInstableDefinition,
   'Another Stable Object' => new AnotherStableDefinition, 
];

foreach ( $Objects as $Object )
{
   $ObjectClass = get_class($Object);
   $ObjectStandard = $Object instanceof stdClass;
   $ObjectEvaluates = $ObjectStandard ? 'does' : "doesn't";
   
   echo "The `{$ObjectClass}` class objects {$ObjectEvaluates} instance from `stdClass`." .PHP_EOL;
}

echo 'All these tests ran under PHP version ' .PHP_VERSION .'.' .PHP_EOL;

/****
 * This script will produce the following text:
 * 
 * The `InstableDefinition` class objects doesn't instance from `stdClass`.
 * The `StableDefinition` class objects does instance from `stdClass`.
 * The `AnotherInstableDefinition` class objects doesn't instance from `stdClass`.
 * The `AnotherStableDefinition` class objects does instance from `stdClass`.
 * All these tests ran under PHP version X.X.XX.
 */