When graphing HRULE items, 'Only Variables should be passed by reference' error may be seen · Issue #2724 · Cacti/cacti · GitHub
PHP 7.0+ - Only variables should be passed by reference · Issue #2550 · squizlabs/PHP_CodeSniffer · GitHub
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PHP Notice: Only variables should be passed by reference in /menu/class-menu.php on line 139 · Issue #15 · infinum/decoupled-json-content · GitHub
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Notice: Only variables should be passed by reference - PHP 7 · Issue #607 · valendesigns/option-tree · GitHub
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