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DIFF.md

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Difference between PHP 5 and PHP 7

Object

Common

  • get object from zvals
    • 5: zend_object_store_get_object(d1 TSRMLS_CC)
    • 7: from offset : (php_object_struct *)((char*)(obj) - XtOffsetOf(php_object_struct, std))

Handlers

  • extra handlers in 7
    • handlers.offset = XtOffsetOf(php_object_struct, std)
    • `handlers.free_obj = object_free_storage_function

create_object_ex (ex method for clone and new)

  • return
    • 5: zend_object_value (retval)
    • 7: zend_object * (&intern->std)
  • intern
    • 5: calloc(1, sizeof(php_object_struct))
    • 7: ecalloc(1, sizeof(php_object_struct) + sizeof(zval) * (class_type->default_properties_count - 1))
  • init props
    • 5: always
    • 7: only for new object (not for clone)
  • save new intern
    • 5: for clone
    • 7: never (it's taken from offset)
  • handlers
    • 5: retval.handlers
    • 7: intern->std.handlers
  • object store
    • 5: zend_objects_store_put(intern, (zend_objects_store_dtor_t)zend_objects_destroy_object, (zend_objects_free_object_storage_t) object_free_storage_function, NULL TSRMLS_CC)
    • 7: none (it's set in init)

create_object

  • return
    • 5: zend_object_value (retval)
    • 7: zend_object * (&intern->std)
  • 2nd argument
    • 5: NULL (intern reference)
    • 7: 1 (whether to init props)

clone_obj

  • return
    • 5: zend_object_value (retval)
    • 7: zend_object * (&intern->std)
  • new object : new_obj
    • 5: reference arg to create_object_ex
    • 7: XtOffsetOf of the create_object_ex result
  • new object value : new_ov
    • 5: result of create_object_ex
    • 7: none
  • clone members
    • 5: zend_objects_clone_members(&new_obj->std, new_ov, &old_obj->std, Z_OBJ_HANDLE_P(this_ptr) TSRMLS_CC)
    • 7: zend_objects_clone_members(&new_obj->std, &old_obj->std TSRMLS_CC)

compare_object

  • get object from zvals (see above)

get_gc

  • table pointer (second argument)
    • 5: zval ***table
    • 7: zval **table

get_properties

  • modifying existing props from zend_std_get_properties
    • 5: zval *: use MAKE_STD_ZVAL and then save
    • 7: zval: save as it is

free_storage

  • get object from zvals (see above)
  • free object
    • 5: efree(intern)
    • 7: do nothing

get_property_ptr_ptr

  • return
    • 5: zval **: ptr of ptr to the engine zval or NULL if overloaded
    • 7: zval *: ptr to engine zval or NULL if overloaded
  • 4th parameter
    • 5: const zend_literal *key
    • 7: void **cache_slot
  • member name handling (2nd param)
    • 5: convert it to string zval if needed and free it if conversion changed zval
    • 7: get zend_string from zval and release the string at the end

read_property

  • return
    • 5: zval **: ptr of ptr to the engine zval or NULL if overloaded
    • 7: zval *: ptr to engine zval or NULL if overloaded
  • 4th parameter
    • 5: const zend_literal *key
    • 7: void **cache_slot
  • extra zval *rv last (5th) parameter in 7
    • the same as zend_read_property
    • also when calling std handler
  • member name handling (2nd param)
    • 5: convert it to string zval if needed and free it if conversion changed zval
    • 7: get zend_string from zval and release the string at the end
  • we need to ensure in 5 that retval is temporary variable
    • Z_SET_REFCOUNT_P(retval, 0); Z_UNSET_ISREF_P(retval);

Methods

  • all have the common issue for getting object from zval (see above)

__construct

  • 7: It is possible to call ZEND_CTOR_MAKE_NULL() if init fails