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run code in 150+ php & hhvm versions
Bugs & Features
<?php $obj = (object)array('123' => '456'); print_r($obj); echo $obj->{123},"\n"; if (!property_exists($obj,'123')) echo 'property 123 does not exist',"\n"; if ( !isset( $obj->{123} ) ) echo 'property 123 is null',"\n";
based on nWBhe
Output for 5.2.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
stdClass Object ( [123] => 456 ) Notice: Undefined property: stdClass::$123 in /in/9CVkZ on line 4 property 123 does not exist property 123 is null
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.2.5
stdClass Object ( [123] => 456 ) Notice: Undefined property: stdClass::$123 in /in/9CVkZ on line 4 property 123 does not exist property 123 is null
Output for 5.0.0 - 5.0.5
stdClass Object ( [123] => 456 ) Notice: Undefined property: stdClass::$123 in /in/9CVkZ on line 4 Fatal error: Call to undefined function property_exists() in /in/9CVkZ on line 5
Process exited with code 255.
Output for 4.3.3 - 4.4.9
Fatal error: Property name must be a string in /in/9CVkZ on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.2
stdClass Object ( [123] => 456 )
Process exited with code 139.