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<?php var_dump('{!' . 5 . '}'); var_dump('{!' . 2 + 1 . '}');
Output for 7.1.0
string(4) "{!5}" Warning: A non-numeric value encountered in /in/CTPb9 on line 4 string(2) "1}"
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
string(4) "{!5}" string(2) "1}"