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run code in 150+ php & hhvm versions
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<?php function o($s) {echo $s;} !is_file('/in/') && o('isn\'t file') xor file_exists('/in/') && o('exists');
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
isn't fileexists