Is it possible to avoid the warning of undefined offset PHP array?

Question

I know the undefined offset gives out warning instead of error but I want to know is there any possible way to avoid this kind of warning to pop out? I intend to write a function to test the undefined offset because I think that writing multiple similar if-else condition to test offset could be much work to be done.

function testOffset($item){
        if(isset($item)){
            return $item;
        }else{
            return "Nothing here!";
        }
    }
$array1[] = "Hello!";
echo testOffset($array1[1]);

In this case the function is work well but the warning will also pop out the moment I assign the unset element into function. Anyway to work around with it?

I purposely set the checking index to 1 to prove the function is working well

How about array_key_exists? (php.net/manual/en/function.array-key-exists.php) — Tiến Nguyễn Hoàng
– Tiến Nguyễn Hoàng, Commented Aug 14, 2018 at 7:47

Nigel Ren · Accepted Answer · 2018-08-14 08:01:25Z

4

If your using PHP 7+ you can use null coalesce to make the whole thing just a one liner...

echo $array1[1] ?? "Nothing here!";

answered Aug 14, 2018 at 8:01

Nigel Ren

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Comments

mleko · Accepted Answer · 2018-08-14 08:19:06Z

4

You can try function like this

function issetOr($arr, $key)
{
    if (isset($arr[$key])) {
        return $arr[$key];
    } else {
        return "Nothing here!";
    }
}
$array1[] = "Hello!";
echo issetOr($array1, 1);

Or if you wan't to check for key existence use

function issetOr($arr, $key)
{
    if (\array_key_exists($key, $arr)) {
        return $arr[$key];
    } else {
        return "Nothing here!";
    }
}
$array1[] = "Hello!";
echo issetOr($array1, 1);

Demo online

edited Aug 14, 2018 at 8:19

answered Aug 14, 2018 at 7:49

mleko

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4 Comments

Rafael Over a year ago

Much better than using @ also.

gitguddoge Over a year ago

I realize this is better than using @ although both way achieve the same result I was looking for in the early. @ means to suppress the warning notice but it is hard to tell that only undefined offset is the only error in other case.

Mohamed El Mrabet Over a year ago

Good @gitguddoge

Mohamed El Mrabet Over a year ago

You can use this native function php.net/manual/fr/function.array-key-exists.php its more better if you want other solution

Naruto · Accepted Answer · 2018-08-14 08:01:28Z

3

There are multiple ways of handling this problem, but depending on what you are trying to do you could do:

foreach($array as $key => $val) {}

If you are just trying to get 1 element based on the key, you should just go with array_key_exists:

$array1[] = "Hello!";
echo (array_key_exists(1, $array1)) ? $array[1] : "No key";

answered Aug 14, 2018 at 8:01

Naruto

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2 Comments

gitguddoge Over a year ago

I guess I didn't consider well into this because I used this in the same project by checking whether the string-based key exists in the array or not... Thanks ya!

Naruto Over a year ago

If they are string based keys, you just add " " around the key

Mohamed El Mrabet · Accepted Answer · 2018-08-14 07:50:42Z

1

For escape warning and notice in php you can use simply an @

function testOffset($item){
    if(isset($item)){
        return $item;
    }else{
        return "Nothing here!";
    }
}
$array1[] = "Hello!";
echo @testOffset($array1[1]);

answered Aug 14, 2018 at 7:50

Mohamed El Mrabet

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6 Comments

gitguddoge Over a year ago

Thanks! This is exactly the answer I was looking for. I knew it would come out the warning notice but I just want to simply ignore it!

Afraz Ahmad Over a year ago

Using @ is not a good practice since it suppresses the error or warning which will be hard to debug for developer.

Mohamed El Mrabet Over a year ago

You are welcome, @AfrazAhmad here the developper assume the responsability, its an focntionallity who offer PHP for a lot of situations

Mohamed El Mrabet Over a year ago

There is other solution like array_key_exists or other @gitguddoge if you want we can chat and i will give you other solution.

gitguddoge Over a year ago

@MohamedElMrabet really thanks for this answer but mleko's answer is better in this way. I'll still upvote for your answer anyway!

|

Ray A · Accepted Answer · 2018-08-14 07:47:14Z

0

Because you are using offset 1, which is not exist,

you can do a simple code fixing by using the below:

function testOffset($item){
        if(isset($item)){
            return $item;
        }else{
            return "Nothing here!";
        }
    }
$array1[] = "Hello!";
echo testOffset($array1[0]);

answered Aug 14, 2018 at 7:47

Ray A

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1 Comment

gitguddoge Over a year ago

thanks for the answer but i intend to do it in this way to try the function

Afraz Ahmad · Accepted Answer · 2018-08-14 07:48:32Z

-2

You can handle this by php array_values builtin function:

$yourArray = array_values($yourArray);

This will rearrange your array indices e.g. You have a array like this:

 $a[0] = '...'
 $a[4] = '...'
 $a[7] = '...'
 $a[8] = '...'
 $a[9] = '...'

after using array_values

 $a[0] = '...'
 $a[1] = '...'
 $a[2] = '...'
 $a[3] = '...'
 $a[4] = '...'

edited Aug 14, 2018 at 7:48

answered Aug 14, 2018 at 7:45

Afraz Ahmad

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2 Comments

gitguddoge Over a year ago

By the mean stops the script execution means it will stops the script if this is in the loop right?

gitguddoge Over a year ago

the warning does not actually stops the script as I tested earlier just now tho

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