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run code in 150+ php & hhvm versions
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<?php $time = time(); while(true) { for($i =0; $i<4; $i++) echo $time.","; sleep(120); $time = time(); echo "\n"; }
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1351425626,1351425626,1351425626,1351425626,
Process exited with code 137.