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<?php $classes = get_declared_classes(); $implementsIface = array(); foreach($classes as $klass) { $reflect = new ReflectionClass($klass); if($reflect->implementsInterface('JsonSerializable')) $implementsIface [] = $klass; } print_r($implementsIface);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => SplFixedArray )
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Array ( )
Output for 5.0.3 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Fatal error: Uncaught exception 'ReflectionException' with message 'Interface JsonSerializable does not exist' in /in/EfW69:6 Stack trace: #0 /in/EfW69(6): ReflectionClass->implementsInterface('JsonSerializabl...') #1 {main} thrown in /in/EfW69 on line 6
Process exited with code 255.
Output for 5.0.1 - 5.0.2
Fatal error: Uncaught exception 'ReflectionException' with message 'Interface JsonSerializable does not exist' in /in/EfW69:6 Stack trace: #0 {main} thrown in /in/EfW69 on line 6
Process exited with code 255.
Output for 5.0.0
Fatal error: Uncaught exception 'ReflectionException' with message 'Interface JsonSerializable doesn't exist' in /in/EfW69:6 Stack trace: #0 {main} thrown in /in/EfW69 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: reflectionclass in /in/EfW69 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: reflectionclass in /in/EfW69 on line 5

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