Only variables should be passed by reference /system/codeigniter/Common.php · Issue #5224 · bcit-ci/CodeIgniter · GitHub
Notice: Only variables should be passed by reference - PHP 7 · Issue #607 · valendesigns/option-tree · GitHub
PHP 7.0+ - Only variables should be passed by reference · Issue #2550 · squizlabs/PHP_CodeSniffer · GitHub
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