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run code in 200+ php & hhvm versions
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<?="{K]X^\31\31EYG_Q\31"^"".M_PI;
Output for 5.4.0 - 7.1.7
Hello, world!
Output for 4.3.0 - 5.3.29
<?="{K]X^\31\31EYG_Q\31"^"".M_PI;