php - Getting reference to array element where array is accessible as $obj->$propName -

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suppose have code (simplified example):

$propertyname = 'items'; $foo = new \stdclass; $foo->$propertyname = array(42);

at point 'd write expression evaluates reference value inside array.

is possible this? if so, how?

an answer "do job" not 'm looking this:

// not acceptable: 2 statements $temp = &$foo->$propertyname; $temp = &$temp[0];

but why write 2 statements? well, because not work:

// not work: php's fantastic grammar strikes again // equivalent $temp = &$foo->i $temp = &$foo->$propertyname[0];

of course &$foo->items[0] unacceptable solution because fixes property name.

in case wondering strange requirements: 'm doing inside loop $foo reference node inside graph. solution involving $temp require unset($temp) afterwards setting $temp on next iteration not mess graph; unset requirement can overlooked if not ultra careful around references, wondering if there way write code such there less possibilities introduce bug.

ambiguous expressions need parser:

$temp = &$foo->{$propertyname}[0];

btw, same regardless if you're looking variable alias (a.k.a. reference) or value. both need if use array-access notation.


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