Although I use isset, I get an undefined index error

Question

I know it asks too many time. But the isset function is not solve my problem.

$get = (isset($this->settings[$set['id']])) ? $this->settings[$set['id']] : '';

Notice: Undefined index: id in \public_html\settings.php on line 419

yes I am thinking of the same, that's what I am suggesting on my answer. — Vidal, Feb 27 '19 at 19:26

score 2 · Answer 1 · answered Feb 27 '19 at 19:25

2

Try to check if the variable is set before using it as an argument.

$get = isset( $set['id']) ? $this->settings[$set['id']] : '';

answered Feb 27 '19 at 19:25

Vidal

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3

Probably need both `isset` checks. – AbraCadaver Feb 27 '19 at 19:26

score 1 · Accepted Answer · answered Feb 27 '19 at 19:30

1

Maybe, $set['id'] must check, like this:

$set_ = isset($set['id']) ? $set['id'] : '';
$value = isset($this->settings[$set_]) ? $this->settings[$set['id']] : '';

answered Feb 27 '19 at 19:30

Habip Oğuz

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score 1 · Answer 3 · answered Feb 27 '19 at 21:00

I would simply add it to the isset call

$get = isset( $set['id'],$this->settings[$set['id']]) ? $this->settings[$set['id']] : '';

You can use multiple arguments in isset. This is roughly equivalent to doing this:

$get = isset($set['id']) && isset($this->settings[$set['id']]) ? $this->settings[$set['id']] : '';

This can be easily tested with this code:

$array = ['foo' => 'bar'];
$set = []; //not set
#$set = ['id' => 'foo']; //uncomment to test if set


#using [] to add an element to a string not an array
$get = isset($set['id'],$array[$set['id']]) ? $array[$set['id']] : '';

echo $get;

When $set = ['id' => 'foo'] the output is bar if you leave that commented then the output is an empty string.

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Although I use isset, I get an undefined index error

3 Answers3