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run code in 150+ php & hhvm versions
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<?php $foo = null; var_dump('language-prof-' . $foo ?: 'language'); $foo = 'foo'; var_dump('language-prof-' . $foo ?: 'language'); $foo = null; var_dump('language-prof-' . ($foo ?: 'language'));
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(14) "language-prof-" string(17) "language-prof-foo" string(22) "language-prof-language"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected ':' in /in/LQNZC on line 3
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 ':' in /in/LQNZC on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/LQNZC on line 3
Process exited with code 255.