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run code in 150+ php & hhvm versions
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<?php class Help { public $test = null; } $test = new Help(); var_dump($test); if ( isset($test->test)) { echo "set"; } else { echo "not"; } echo (bool) $test->test === false;
based on 91gWA
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
object(Help)#1 (1) { ["test"]=> NULL } not1
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/POP5m on line 4
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/POP5m on line 4
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/POP5m on line 4
Process exited with code 255.