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<?php $intNumber = 1; $stringNumber = '1'; var_dump(chr($intNumber[0] + 100)); var_dump(chr($stringNumber[0] + 100));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.4
string(1) "d" string(1) "e"