An implementation of zval_id in C for PHP extensions

zval_id.phpx

ZEND_BEGIN_ARG_INFO_EX(phpx_byref_arginfo, 
    1 /*pass_rest_by_reference*/, 
    0/*return_reference*/,
    1/*required_num_args*/)
ZEND_ARG_PASS_INFO(1/*by_ref*/)
ZEND_END_ARG_INFO();

PHP_FUNCTION(zval_id)
{
    //computes the address of first zval sent to it, 
    //and the remainder are ided after it.
    zval *z;
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,"z",&z)==FAILURE)
        return;
    long id=*(( long*)(&z->value)); //return_value will become the address
    static long base=0;
    if (base==0) base=id-1; 
    id=(id^base)>>3; //zval is at least 16 bytes
    RETURN_LONG(id);
}