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run code in 150+ php & hhvm versions
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<?php $array = array( 'filters'=> array('where'=>array('yr'=>1994))); echo array_shift($keys = array_keys($array['filters']['where']));
based on uBHQm
Output for 7.0.0 - 7.1.0
Notice: Only variables should be passed by reference in /in/QNI7P on line 3 yr
Output for 5.1.2 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/QNI7P on line 3 yr
Output for 4.3.0 - 5.1.1
yr