Looks like this was added here #10670

Looks like we have a solution here:
https://github.com/ramsey/array_column

@mbabker sugested this package https://github.com/symfony/polyfill-php55

we shouldn't add a package only because of one use of this function

I will make a patch

@rdeutz FWIW when the joomla/registry package gets updated again the symfony/polyfill-php55 package will get pulled in as a dependency of it because I changed the JSON format object's stringToObject() method to throw an Exception on a json_decode() error and use json_last_error_msg() to get the message (function added in PHP 5.5). So the polyfill will inherently be pulled into the CMS at some point.

@mbabker yeah might be, but pulling a new package in while in beta just to not code 5 lines of PHP code seems not right

PR #10943

Closed as we have a PR #10943

There's already an API function doing the same like array_column:
ArrayHelper::getColumn($redirects, 'old_url')