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<?php namespace Foo; define('Foo\\true', false); if (true) { echo "TRUE"; } else { echo "FALSE!!!"; }
Output for php7@20141001 - 20150301, hhvm-3.4.1 - 3.6.0
TRUE
Output for hhvm-3.3.1 - 3.4.0

Process exited with code 153.
Output for 5.3.0 - 5.6.7, php7@20140507 - 20140901
FALSE!!!
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/S2AFZ on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/S2AFZ on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/S2AFZ on line 2
Process exited with code 255.