Warning: Undefined array key 1

Question

It only started giving me problems when i upgraded to php 8.1.

The issue is on the line $time = $matches

Although, this is a very generic question and probably has been answered quite a few time something similar. I looked through some of the other questions with a similar title but i'm still confused on what i need to do in my code particular.

   /**
         * Generates filtered time input from user to formatted time (YYYY-MM-DD)
         *
         * @param mixed $time
         * @return string
         */
        protected function filterTimeInput(mixed $time): string
        {
            $matches = [];
            preg_match('/(\d+-\d+-\d+)T(\d+:\d+)/', $time, $matches);
            $time = $matches[1] . " " . $matches[2];
            return strftime('%Y-%m-%d %H:%M:00', strtotime($time));
        }

Please any help would be greatly appreciated.

When provided $time does not match the pattern, the $matches will be an empty array. That will throw a "Undefined array key" error if you try access any index. — AhmCho
– AhmCho, Commented Jun 28, 2023 at 18:12
@AhmCho so what do i need to do to fix this? I need to assign something to $matches? I'm confused still on what needs to be done here. — Singleton
– Singleton, Commented Jun 30, 2023 at 20:08
The very first thing that comes in mind is just to check if $matches has any values (not empty) and then do your transformations. And if the the array is empty, your function may return the value as it is. — AhmCho
– AhmCho, Commented Jul 1, 2023 at 7:17
Does this answer your question? "Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP — DarkBee
– DarkBee, Commented Dec 21, 2023 at 10:51

miRastic · Accepted Answer · 2023-12-21 07:27:34Z

-1

To fix the error I would use isset builtin of PHP or null coalesce operator

$match_1 = $matches[1] ?? ""; # Null coalesce example
$match_2 = isset($matches[2]) ? $matches[2] : ""; # isset example
$time = $match_1 . " " . $match_2;

answered Dec 21, 2023 at 7:27

miRastic

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