PHP_STREAM_LOCK_SUPPORTED  415 main/php_streams.h #define php_stream_supports_lock(stream)	_php_stream_set_option((stream), PHP_STREAM_OPTION_LOCKING, 0, (void *) PHP_STREAM_LOCK_SUPPORTED) == 0 ? 1 : 0
PHP_STREAM_LOCK_SUPPORTED  664 main/streams/plain_wrapper.c 			if ((zend_uintptr_t) ptrparam == PHP_STREAM_LOCK_SUPPORTED) {