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Why does isset() not work when the property names are in variables? $Object = new stdClass(); $Object->tst = array('one' => 1, 'two' => 2); $tst = 'tst'; $one = 'one'; var_dump( $Object, isset( $Object->tst['one'] ), isset( $Object->$tst[ $one ] ) ); outputs the following: object(stdClass)#39 (1) { ["tst"]=> array(2) { ["one"]=> int(1) ["two"]=> int(2) } } bool(true) bool(false) // was expecting true here.. Edit: went on toying around with the code, and found out that var_dump( $Object->$tst['one'] ); outputs a Notice: E_NOTICE: Undefined property: stdClass::$t So I think the problem is that the $tst[...] part is evaluated in 'string mode' (evaluating to the first character in the string; in this case "t"), before going onto fetching the property from the object; var_dump( $tst, $tst['one'] ); // string(3) "tst" string(1) "t" Solution: is to put braces around the variable name ( $this->{$tst} ), to tell the interpreter to retrieve its value first, and then evaluate the [...] part: var_dump( $Object->{$tst}['one'] ); // int(1) yay!

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