PHP 7.0+ - Only variables should be passed by reference · Issue #2550 · squizlabs/PHP_CodeSniffer · GitHub
Strict standards: Only variables should be passed by reference in D:\wamp\www\cats\lib\DataGrid.php on line 1714 · Issue #39 · opencats/OpenCATS · GitHub
![When graphing HRULE items, 'Only Variables should be passed by reference' error may be seen · Issue #2724 · Cacti/cacti · GitHub When graphing HRULE items, 'Only Variables should be passed by reference' error may be seen · Issue #2724 · Cacti/cacti · GitHub](https://user-images.githubusercontent.com/12864741/59155015-5b8aba80-8a3c-11e9-8678-56f04823b5e2.png)