static void *_zend_mm_alloc_int(zend_mm_heap *heap, size_t size ZEND_FILE_LINE_DC ...) 

{ 

    size_t true_size, best_size = 0x7fffffff; 

    zend_mm_free_block *p, *end, *best_fit = NULL; 



    true_size = ZEND_MM_TRUE_SIZE(size); 



    The macro expands to 



    (((long)size<(long)ZEND_MM_MIN_SIZE)?(ZEND_MM_ALIGNED_MIN_HEADER_SIZE): 

    (ZEND_MM_ALIGNED_SIZE(size+ZEND_MM_ALIGNED_HEADER_SIZE+END_MAGIC_SIZE)))