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run code in 150+ php & hhvm versions
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<?php $heading = 'h2'; $heading += 4; echo $heading;
Output for 7.1.0
Warning: A non-numeric value encountered in /in/AF6Ak on line 3 4
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
4