<?php echo 'Hello world!'; echo 'Hello' . ' ' . 'world!'; printf('Hello world!'); file_put_contents('php://stdout', 'Hello world!'); printf('%c%c%c%c%c%c%c%c%c%c%c%c', 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x21);
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