Undefined offset for an array in php

Question

I have the following code:

$count_table = array();
foreach ($events_tab as $event) {
    if(isset($event["nature"])){
        $count_table[$event["nature"]]++;
    }

}

The array events_tab is like this :

Array
(
     [0] => Array
       (
        [nature] => 300
        [id] => 100828698
    )

[1] => Array
    (
        [nature] => 3001
        [id] => 100828698
    )

)

I get the error : Undefined offset: 300 in this line : $count_table[$event["nature"]]++;. Please help me!! Thx in advance!!

$count_table[300] isn't set, but you're trying to increment the value that it holds..... how can you increment a value that doesn't exist? — Mark Baker
– Mark Baker, Commented May 22, 2015 at 9:18
Replace $count_table[$event["nature"]]++; with isset($count_table[$event["nature"]]) ? $count_table[$event["nature"]]++ : $count_table[$event["nature"]] = 1; — Mark Baker
– Mark Baker, Commented May 22, 2015 at 9:19
Or even replace the whole thing with a simple: $count_table = array_count_values(array_column($events_tab, 'nature', 'nature')); should work with recent versions of PHP — Mark Baker
– Mark Baker, Commented May 22, 2015 at 9:22

KTAnj · Accepted Answer · 2015-05-22 09:28:23Z

2

$count_table = array();
foreach ($events_tab as $event) {

    if(isset($event["nature"])){
        if(!isset($count_table[$event["nature"]])){
            $count_table[$event["nature"]]=0;
        }
        $count_table[$event["nature"]]++;
    }
}

answered May 22, 2015 at 9:28

KTAnj

1,3561 gold badge15 silver badges36 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Sougata Bose · Accepted Answer · 2015-05-22 10:25:34Z

0

Check on $count_table if the key is set. It should be -

if(isset($count_table[$event["nature"]])){
    $count_table[$event["nature"]]++;
} else {
    $count_table[$event["nature"]] = 0;
}

edited May 22, 2015 at 10:25

answered May 22, 2015 at 9:25

Sougata Bose

31.8k8 gold badges52 silver badges89 bronze badges

Collectives™ on Stack Overflow

Undefined offset for an array in php

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related