How to fix Fatal error: Cannot redeclare isAnyElementInArray?

Question

PHP

Previously, there was one component on the page, then, if necessary, it was necessary to use it several times:
here is a part of the code from the component that caused the error

function isAnyElementInArray($arNeedle, $arHaystack)
{
    foreach ($arNeedle as $curNeedle)
    {
        if (in_array($curNeedle,$arHaystack))
        {
            return $curNeedle;
        }
    }
    return false;
}

The text of the error itself:

Fatal error: Cannot redeclare isAnyElementInArray() (previously declared in /home/bitrix/www/bitrix/templates.........) in /home/bitrix/www/bitrix/templates......... on line 15

Moreover, on the test server where the development was going on, there is no such error, but on the combat one it is.

Answer 1

if(!function_exists('isAnyElementInArray')) {
    function isAnyElementInArray($arNeedle, $arHaystack) {}
}

Answer 2

You already have an isAnyElementInArray function and you are trying to declare another one with the same name.
Solutions:
Find where it already exists and use it
Change the name of this new feature
Learn from namespaces

and what does she mean?

Not ashamed? If only the translator drove this message.