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<?php $foo = (object) array( 'bar' => 'baz' ); var_dump('exists? (1)', property_exists($foo, 'bar')); unset($foo->bar); var_dump('exists? (2)', property_exists($foo, 'bar'));
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(11) "exists? (1)" bool(true) string(11) "exists? (2)" bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function property_exists() in /in/n9JSN on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: property_exists() in /in/n9JSN on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: property_exists() in /in/n9JSN on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: property_exists() in /in/n9JSN on line 7