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run code in 150+ php & hhvm versions
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<?php define(myvalue, "10"); $myarray[10] = "Dog"; $myarray[] = "Human"; $myarray["myvalue"] = "Cat"; $myarray["Dog"] = "Cat"; print "O valor é: "; print $myarray[myvalue]."\n";
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant myvalue - assumed 'myvalue' in /in/a5KSn on line 2 O valor é: Dog
Output for hhvm-3.10.0

Process exited with code 153.