1--TEST-- 2Observer: Retvals are observable that are: IS_CONST 3--SKIPIF-- 4<?php if (!extension_loaded('zend-test')) die('skip: zend-test extension required'); ?> 5--INI-- 6zend_test.observer.enabled=1 7zend_test.observer.observe_all=1 8zend_test.observer.show_return_value=1 9opcache.optimization_level=0 10--FILE-- 11<?php 12function foo() { 13 return 'I should be observable'; // IS_CONST 14} 15 16$res = foo(); // Retval used 17foo(); // Retval unused 18 19echo 'Done' . PHP_EOL; 20?> 21--EXPECTF-- 22<!-- init '%s%eobserver_retval_%d.php' --> 23<file '%s%eobserver_retval_%d.php'> 24 <!-- init foo() --> 25 <foo> 26 </foo:'I should be observable'> 27 <foo> 28 </foo:'I should be observable'> 29Done 30</file '%s%eobserver_retval_%d.php'> 31