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<?php $a = 'TEST'; preg_match('/./', array(), $a); var_dump($a); ;;
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Warning: preg_match() expects parameter 2 to be string, array given in /in/0PbkV on line 4 string(4) "TEST"
Output for 4.3.0 - 4.3.2
Notice: Array to string conversion in /in/0PbkV on line 4 array(1) { [0]=> string(1) "A" }