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run code in 150+ php & hhvm versions
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<?php print "ssh -p ".escapeshellarg("22'`ssh -p 22 root@localhost date`' "). " kgrisel@localhost uptime";
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
ssh -p '22'\''`ssh -p 22 root@localhost date`'\'' ' kgrisel@localhost uptime