问题:
手动设置或读取值时,ArrayObject可以按预期工作,但是当使用函数(例如foreach)对其进行迭代时,情况会变得很糟糕.
它不调用我定义的offset *方法,而是使用ArrayIterator方法.
码:
班级:
class obsecureArray extends ArrayObject {
public function offsetSet($name, $value) {
call_user_func_array(array('parent', __FUNCTION__), array(base64_encode($name), base64_encode($value)) );
}
public function offsetGet($name) {
return base64_decode( call_user_func_array(array('parent', __FUNCTION__), (array) base64_encode($name) ) );
}
public function offsetExists($name) {
return call_user_func_array(array('parent', __FUNCTION__), (array) base64_encode($name) );
}
public function offsetUnset($name) {
return call_user_func_array(array('parent', __FUNCTION__), (array) base64_encode($name) );
}
}
用法示例:
$a = new obsecureArray();
$a['test'] = 'Value';
$a[2] = '1';
define('BR','<br />');
echo 'test: ',$a['test'],BR,'2: ',$a[2],BR;
foreach($a as $key => $value)
echo 'Key: ',$key,' Value:',$value,BR;
输出:
test: Value
2: 1
Key: dGVzdA== Value:VmFsdWU=
Key: Mg== Value:MQ==
解决方法:
我查看了ArrayObject __construct
方法documentation,发现了与我的问题有关的第三个参数:
iterator_class:
Specify the class that will be used for iteration of
the ArrayObject object. ArrayIterator is the default class used.
现在,我可以使用自己的offset *方法扩展ArrayIterator
并将其传递给ArrayObject的构造函数,因此我研究了ArrayIterator,它与ArrayObject几乎相同,只是它显然没有使用外部迭代器.因此,我要做的只是扩展ArrayIterator.并且还必须覆盖当前和关键方法.
这样我有:
class obsecureArray extends ArrayIterator {
public function offsetSet($name, $value) {
call_user_func_array(array('parent', __FUNCTION__), array(base64_encode($name), base64_encode($value)));
}
public function offsetGet($name) {
return base64_decode(call_user_func_array(array('parent', __FUNCTION__), (array) base64_encode($name)));
}
public function offsetExists($name) {
return call_user_func_array(array('parent', __FUNCTION__), (array) base64_encode($name));
}
public function offsetUnset($name) {
return call_user_func_array(array('parent', __FUNCTION__), (array) base64_encode($name));
}
public function key() {
return base64_decode(parent::key());
}
public function current() {
return base64_decode(parent::current());
}
}
并按预期完美运行.
对于:
$a = new obsecureArray();
$a['test'] = 'Value';
$a[2] = '1';
define('BR','<br />');
echo 'test: ',$a['test'],BR,'2: ',$a[2],BR;
foreach($a as $key => $value)
echo 'Key: ',$key,' Value:',$value,BR;
我有:
test: Value 2: 1 Key: test Value:Value Key: 2 Value:1