UPGRADING.INTERNALS

$Id$

UPGRADE NOTES - PHP X.Y

1. Internal API changes
  a. Addition of do_operation and compare object handlers

2. Build system changes
  a. Unix build system changes
  b. Windows build system changes


========================
1. Internal API changes
========================

  a. Addition of do_operation and compare object handlers

  Two new object handlers have been added:

    do_operation:
    typedef int (*zend_object_do_operation_t)(
        zend_uchar opcode, zval *result, zval *op1, zval *op2 TSRMLS_DC
    );

    compare:
    typedef int (*zend_object_compare_zvals_t)(
        zval *result, zval *op1, zval *op2 TSRMLS_DC
    );

  The first handler is used to overload arithmetic operations. The first
  argument specifies the opcode of the operator, result is the target zval,
  op1 the first operand and op2 the second operand. For unary operations
  op2 is NULL. If the handler returns FAILURE PHP falls back to the default
  behavior for the operation.

  The second handler is used to perform comparison operations with
  non-objects. The value written into result must be an IS_LONG with value
  -1 (smaller), 0 (equal) or 1 (greater). The return value is a SUCCESS/FAILURE
  return code. The difference between this handler and compare_objects is
  that it will be triggered for comparisons with non-objects and objects of
  different types. It takes precedence over compare_objects.

  Further docs in the RFC: https://wiki.php.net/rfc/operator_overloading_gmp

========================
2. Build system changes
========================

  a. Unix build system changes
    - 

  b. Windows build system changes
    -