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<?php $data = [ 'item_1' => 'value_1', 'item_2' => 'value_2', ]; var_dump(array_walk($data, static function (&$value, &$key) { $value = $key; })); var_dump($data);
Output for 8.4.1 - 8.4.14, 8.5.0 - 8.5.1
Warning: {closure:/in/ZmrdO:8}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 8 Warning: {closure:/in/ZmrdO:8}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 8 bool(true) array(2) { ["item_1"]=> string(6) "item_1" ["item_2"]=> string(6) "item_2" }
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.28
Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 8 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 8 bool(true) array(2) { ["item_1"]=> string(6) "item_1" ["item_2"]=> string(6) "item_2" }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33
Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 10 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ZmrdO on line 10 bool(true) array(2) { ["item_1"]=> string(6) "item_1" ["item_2"]=> string(6) "item_2" }
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
bool(true) array(2) { ["item_1"]=> string(6) "item_1" ["item_2"]=> string(6) "item_2" }

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