以编程方式访问PHP对象内容，即使在更深层次

accessing object content within PHP works fine when you only set a single level like this:

$obj = new stdClass();
$obj->name1 = 'value1';
$param1 = 'name1';
echo $obj->$param1; // echoes values1 as expected

But what if I need deeper object content like this (w/o transforming it into an array first or similar stuff...)

$obj = new stdClass();
$obj->name1->name2 = 'value2';
$param2 = 'name1->name2';
echo $obj->$param2; // does not echo value2 obviously

How can I solve this?

First approach (simple):

$obj = new stdClass();
$obj->name1->name2 = 'value2';
$param1 = 'name1';
$param2 = 'name2';
echo $obj->$param1->$param2;

Second approach (more generalized):

$obj = new stdClass();
$obj->name1->name2 = 'value2';
$params = 'name1->name2';

$value = $obj;
foreach(preg_split("/-\>/",$params) as $param)
    $value = $value->$param;

echo $value;

You could just parse the $param2 string and print out the value at the end:

$result = $obj;
foreach( explode( '->', $param2) as $var) {
    $result = $result->$var;
}
echo $result;

But... I don't see why you wouldn't use an array for this.