Question

Can Anyone Explain This Behavior?

    $object = new stdClass();


    //This works.
    $object->test = "Test";

    //This works.
    $arbitrary = "arbitrary";
    $object->$$arbitrary = "again, testing";

    //This works.
    $object->id = "2";

    //This fails
    $test = "id";
    $object->$$test  = "2";  // On this line.

I’m trying to set the ‘id’ property through a dynamic variable name. I can set the ‘id’ property fine if I explicitly state it. I can set other variable names dynamically – i.e ‘arbitrary’. Any suggestions?

Answer 1

There is no variable named $id.

Try this

$id = "2";

$test = "id";
$object->$$test  = "2";  // On this line.