Online PHP editor | refs for 6XMc4

<?php function getusername($user) { return 'genericUser'; } function test ($user) { { // original question $usernameA = $user ?: getusername($user); echo '$usernameA = ', var_export($usernameA, true), PHP_EOL; } { // equivalent if( $user ) { $usernameB = $user; } else { $usernameB = getusername($user); } echo '$usernameB = ', var_export($usernameB, true), PHP_EOL; } } $testCases = array('someUser', true, '', null, false, 0, @$undefined); foreach ( $testCases as $testCase ) { echo 'test with ', var_export($testCase , true) ,' ...', PHP_EOL; test($testCase); echo 'test with ', var_export($testCase , true) ,' DONE.', PHP_EOL; echo PHP_EOL; }