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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 git.master, git.master_jit, rfc.property-hooks
Array ( [0] => SplFixedArray )

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