blk               546 Zend/zend_alloc.c #define ZEND_MM_BLOCK_AT(blk, offset)	((zend_mm_block *) (((char *) (blk))+(offset)))
blk               548 Zend/zend_alloc.c #define ZEND_MM_HEADER_OF(blk)			ZEND_MM_BLOCK_AT(blk, -(int)ZEND_MM_ALIGNED_HEADER_SIZE)