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<?php $ok = true; function foo($first, &$second = null) { global $ok; if (!is_null($second)) { // <-- You're supposed to change this line // if (func_num_args() == 2) works, but am wondering // if there are better methods that deal directly with $second // in case the function signature changes. if ($first == 'a') { $ok = false; echo "Failed: This should not be triggering for Call A.\n"; } $second = 'world'; } } // Call A foo('a'); // Call B foo('b', $test); if ($test !== 'world') { $ok = false; echo "Failed: \$test should be assigned.\n"; } if ($ok) { echo "Success. Please share your solution.\n"; }
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