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<?php class Foo { public $bar = 'barValue'; protected $baz = 'bazValue'; private $tab = 'tabValue'; } $data = (array) new Foo(); var_dump($data); reset($data); $key = key(current($data)); echo end(explode('\0', $key));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { ["bar"]=> string(8) "barValue" ["*baz"]=> string(8) "bazValue" ["Footab"]=> string(8) "tabValue" } Fatal error: Uncaught TypeError: key(): Argument #1 ($array) must be of type array, string given in /in/LFWtH:10 Stack trace: #0 /in/LFWtH(10): key('barValue') #1 {main} thrown in /in/LFWtH on line 10
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
array(3) { ["bar"]=> string(8) "barValue" ["*baz"]=> string(8) "bazValue" ["Footab"]=> string(8) "tabValue" } Warning: key() expects parameter 1 to be array, string given in /in/LFWtH on line 10 Notice: Only variables should be passed by reference in /in/LFWtH on line 12
Output for 7.3.32 - 7.3.33, 7.4.26
array(3) { ["bar"]=> string(8) "barValue" ["*baz"]=> string(8) "bazValue" ["Footab"]=> string(8) "tabValue" } Warning: key() expects parameter 1 to be array, string given in /in/LFWtH on line 10
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
array(3) { ["bar"]=> string(8) "barValue" ["*baz"]=> string(8) "bazValue" ["Footab"]=> string(8) "tabValue" } Warning: key() expects parameter 1 to be array, string given in /in/LFWtH on line 10 Strict Standards: Only variables should be passed by reference in /in/LFWtH on line 12
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
array(3) { ["bar"]=> string(8) "barValue" ["*baz"]=> string(8) "bazValue" ["Footab"]=> string(8) "tabValue" } Warning: key(): Passed variable is not an array or object in /in/LFWtH on line 10 Strict Standards: Only variables should be passed by reference in /in/LFWtH on line 12
Output for 5.0.5
array(3) { ["bar"]=> string(8) "barValue" ["*baz"]=> string(8) "bazValue" ["Footab"]=> string(8) "tabValue" } Fatal error: Only variables can be passed by reference in /in/LFWtH on line 10
Process exited with code 255.
Output for 5.0.0 - 5.0.4
array(3) { ["bar"]=> string(8) "barValue" ["*baz"]=> string(8) "bazValue" ["Footab"]=> string(8) "tabValue" } Warning: key(): Passed variable is not an array or object in /in/LFWtH on line 10
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/LFWtH on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/LFWtH on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/LFWtH on line 3
Process exited with code 255.

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