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run code in 150+ php & hhvm versions
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<?php $obj = (object)array('123a' => '456'); print_r($obj); if (!property_exists($obj,'123a')) echo 'property 123a does not exist',"\n"; if ( !isset( $obj->{'123a'} ) ) echo 'property 123a is null',"\n";
based on jXC77
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
stdClass Object ( [123a] => 456 )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
stdClass Object ( [123a] => 456 ) Fatal error: Call to undefined function property_exists() in /in/RU74A on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
stdClass Object ( [123a] => 456 ) Fatal error: Call to undefined function: property_exists() in /in/RU74A on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
stdClass Object ( [123a] => 456 ) Fatal error: Call to undefined function: property_exists() in /in/RU74A on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
stdClass Object ( [123a] => 456 ) Fatal error: Call to undefined function: property_exists() in /in/RU74A on line 4