EDIT: Siehe die Antwort von Alexander Konstantinov. Ich dachte an die __get magic-Methode, die analog ist, aber tatsächlich korrekt implementiert wurde. Sie können das also nicht ohne eine interne Implementierung Ihrer Klasse tun.
EDIT2: Interne Umsetzung:
Hinweis: Sie könnten argumentieren, diese rein masturbatory ist, aber trotzdem hier geht es:
static zend_object_handlers object_handlers;
static zend_object_value ce_create_object(zend_class_entry *class_type TSRMLS_DC)
{
zend_object_value zov;
zend_object *zobj;
zobj = emalloc(sizeof *zobj);
zend_object_std_init(zobj, class_type TSRMLS_CC);
zend_hash_copy(zobj->properties, &(class_type->default_properties),
(copy_ctor_func_t) zval_add_ref, NULL, sizeof(zval*));
zov.handle = zend_objects_store_put(zobj,
(zend_objects_store_dtor_t) zend_objects_destroy_object,
(zend_objects_free_object_storage_t) zend_objects_free_object_storage,
NULL TSRMLS_CC);
zov.handlers = &object_handlers;
return zov;
}
/* modification of zend_std_read_dimension */
zval *read_dimension(zval *object, zval *offset, int type TSRMLS_DC) /* {{{ */
{
zend_class_entry *ce = Z_OBJCE_P(object);
zval *retval;
void *dummy;
if (zend_hash_find(&ce->function_table, "offsetgetref",
sizeof("offsetgetref"), &dummy) == SUCCESS) {
if(offset == NULL) {
/* [] construct */
ALLOC_INIT_ZVAL(offset);
} else {
SEPARATE_ARG_IF_REF(offset);
}
zend_call_method_with_1_params(&object, ce, NULL, "offsetgetref",
&retval, offset);
zval_ptr_dtor(&offset);
if (!retval) {
if (!EG(exception)) {
/* ought to use php_error_docref* instead */
zend_error(E_ERROR,
"Undefined offset for object of type %s used as array",
ce->name);
}
return 0;
}
/* Undo PZVAL_LOCK() */
Z_DELREF_P(retval);
return retval;
} else {
zend_error(E_ERROR, "Cannot use object of type %s as array", ce->name);
return 0;
}
}
ZEND_MODULE_STARTUP_D(testext)
{
zend_class_entry ce;
zend_class_entry *ce_ptr;
memcpy(&object_handlers, zend_get_std_object_handlers(),
sizeof object_handlers);
object_handlers.read_dimension = read_dimension;
INIT_CLASS_ENTRY(ce, "TestClass", NULL);
ce_ptr = zend_register_internal_class(&ce TSRMLS_CC);
ce_ptr->create_object = ce_create_object;
return SUCCESS;
}
jetzt dieses Skript:
<?php
class ArrayTest extends TestClass implements ArrayAccess {
private $_arr = array(
'test' => array(
'bar' => 1,
'baz' => 2
)
);
public function offsetExists($name) {
return isset($this->_arr[$name]);
}
public function offsetSet($name, $value) {
$this->_arr[$name] = $value;
}
public function offsetGet($name) {
throw new RuntimeException("This method should never be called");
}
public function &offsetGetRef($name) {
return $this->_arr[$name];
}
public function offsetUnset($name) {
unset($this->_arr[$name]);
}
}
$arrTest = new ArrayTest();
echo (isset($arrTest['test']['bar'])?"test/bar is set":"error") . "\n";
echo $arrTest['test']['baz']; // Echoes 2
echo "\n";
unset($arrTest['test']['baz']);
echo (isset($arrTest['test']['baz'])?"error":"test/baz is not set") . "\n";
$arrTest['test']['baz'] = 5;
echo $arrTest['test']['baz']; // Echoes 5
gibt:
test/bar is set
2
test/baz is not set
5
ORIGINAL folgt - das ist falsch:
Ihre offsetGet
Implementierung muss eine Referenz zurückgeben, damit sie funktioniert.
public function &offsetGet($name) {
return $this->_arr[$name];
}
Für die interne Äquivalent finden here.
Since there's no analogous to get_property_ptr_ptr, you ought to return a reference (in the sense of Z_ISREF) or a proxy object (see the get handler) in write-like contexts (types BP_VAR_W, BP_VAR_RW and BP_VAR_UNSET), though it's not mandatory. If read_dimension is being called in a write-like context such as in $val =& $obj['prop'], and you return neither a reference nor an object, the engine emit a notice. Obviously, returning a reference is not enough for those operations to work correctly, it is necessary that modifying the returned zval actually has some effect. Note that assignments such as $obj['key'] = &$a are still not possible – for that one would need the dimensions to actually be storable as zvals (which may or may not be the case) and two levels of indirection.
In der Summe Operationen, die eine Unter Dimension des Unter Eigenschaft Aufruf offsetGet beinhalten das Schreiben oder unseting, nicht offsetSet, offsetExists oder offsetUnset.
Sie verpassen ein schließendes ')' auf dem Unset ($ arrTest ['test'] ['bar']; // Fehlerzeile War das ein Problem im ursprünglichen Code? – 88ad