3v4l.org

run code in 300+ PHP versions simultaneously
<?php function nullifyEmptyStrings(array $array) { return array_map(function ($item) { return $item !== '' ? $item : null; }, $array); } $row = [ 'first' => 'foo', 'second' => '', 'third' => '', 'fourth' => 'bar', ]; var_dump(nullifyEmptyStrings($row));
Output for 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(4) { ["first"]=> string(3) "foo" ["second"]=> NULL ["third"]=> NULL ["fourth"]=> string(3) "bar" }
preferences:
103.01 ms | 1510 KiB | 4 Q