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run code in 150+ php & hhvm versions
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<?php var_dump(ctype_xdigit(333,4532,345));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Warning: ctype_xdigit() expects exactly 1 parameter, 3 given in /in/cJEGV on line 3 NULL