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run code in 150+ php & hhvm versions
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<?php putenv("TEST=TEST"); $test = getenv("TEST"); echo "TEST = " .$test." "; putenv("TEST1=$test"); $test1 = getenv("TEST1"); echo "TEST1 = " .$test1;
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0RC5
TEST = TEST TEST1 = TEST