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run code in 150+ php & hhvm versions
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<?php $b = array( 1 => '1', 2 => '2', ); $a = @$b[3] ?: 'lorem'; var_dump($a);
based on fo435
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(5) "lorem"
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/DAKIh on line 6
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/DAKIh on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/DAKIh on line 6
Process exited with code 255.