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!!

• Mark Baker: $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?
• Deenadhayalan Manoharan: What do you want exactly?
• Mark Baker: Replace $count_table[$event["nature"]]++; with isset($count_table[$event["nature"]]) ? $count_table[$event["nature"]]++ : $count_table[$event["nature"]] = 1;
• TanGio: Increment the array : $count_table
• Mark Baker: 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

Answer 1

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

Answer 2

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;
}