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<?php class MyClass{ public function writeit(){ $input = array( array( 'a' => 'vmi', 'tag_name' => 'google' ), array( 'a' => 'vmi2', 'tag_name' => 'technology' ) ); echo "(".implode(', ', array_map("MyClass::findentry", $input)).")"; } public static function findentry ($entry) { return $entry['tag_name']; } } $mc = new MyClass(); $mc->writeit();
Output for 5.2.2 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
(google, technology)
Output for 5.1.2 - 5.1.6, 5.2.0 - 5.2.1
Warning: array_map(): An error occurred while invoking the map callback in /in/NZ3mZ on line 17 Warning: implode(): Bad arguments. in /in/NZ3mZ on line 17 ()
Output for 5.1.0 - 5.1.1

Process exited with code 139.
Output for 5.0.0 - 5.0.5
Warning: array_map(): The first argument, 'MyClass::findentry', should be either NULL or a valid callback in /in/NZ3mZ on line 17 Warning: implode(): Bad arguments. in /in/NZ3mZ on line 17 ()
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/NZ3mZ on line 5
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/NZ3mZ on line 5
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/NZ3mZ on line 5
Process exited with code 255.
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293.4 ms | 401 KiB | 459 Q