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run code in 150+ php & hhvm versions
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<?php class test { protected $_prop = 123; public function get($key) { return $this->{"_{$key}"}; } public function __get($key) { return $this->{"_{$key}"}; } } $c = new test(); echo $c->prop.PHP_EOL.$c->get('prop');
Output for 5.0.2 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
123 123
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/26AF9 on line 20 123PHP_EOL123
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/26AF9 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/26AF9 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/26AF9 on line 5
Process exited with code 255.