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<?php class A{ public $null = null; } $a = new A; var_dump(isset($a->'null')); var_dump(array_key_exists((string) 'null', $a));
Output for 5.4.0 - 5.5.7
Parse error: syntax error, unexpected ''null'' (T_CONSTANT_ENCAPSED_STRING), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/9e0UL on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting T_STRING or T_VARIABLE or '{' or '$' in /in/9e0UL on line 7
Process exited with code 255.