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run code in 200+ php & hhvm versions
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<?php $url='script.php?a=0&page=0'; $url='asdfad'; $i=2; echo strpos($url,'a'); ?>
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.22.0, 7.0.0 - 7.3.0rc3
0
Output for hhvm-3.12.14

Process exited with code 137.