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run code in 150+ php & hhvm versions
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<?php $obj = new stdClass; $obj->{123} = '456'; print_r($obj); if (property_exists($obj,123)) echo 'Property 123 exists',"\n"; if (isset($obj->{123})) { echo "Property value: {$obj->{123}}\n";}
based on Z09QF
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
stdClass Object ( [123] => 456 ) Property 123 exists Property value: 456
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
stdClass Object ( [123] => 456 ) Fatal error: Call to undefined function property_exists() in /in/jomf2 on line 6
Process exited with code 255.
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/jomf2 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.2

Process exited with code 139.