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![Only variables should be passed by reference [#1614450] | Drupal.org](https://www.drupal.org/files/Screen%20shot%202012-06-02%20at%204.39.45%20PM.png "Only variables should be passed by reference [#1614450] | Drupal.org")
Only variables should be passed by reference [#1614450] | Drupal.org
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Notice: Only variables should be passed by reference - PHP 7 · Issue #607 · valendesigns/option-tree · GitHub
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When graphing HRULE items, 'Only Variables should be passed by reference' error may be seen · Issue #2724 · Cacti/cacti · GitHub
Pass by Reference vs. Value in Python
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Strict warning: Only variables should be passed by reference [#2892182] | Drupal.org
