An implementation of is_ref for PHP in C (for extensions)

is_ref.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(is_ref)
{
    zval *z;
    int res;
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,"z",&z)==FAILURE)
        return;
    RETURN_BOOL(Z_REFCOUNT_P(z) > 2); 
    //1 is the reference sent to this function, the other is the actual var. 
    //if more, reference!
}