Changing variable Key values in Array with a Foreach loop

Question

foreach( $notZeroValue as $cardSetPosition => $timesChosen){
    echo $groupValue;
    $notZeroValue[$cardSetPosition + ($groupValue*100)] = $notZeroValue[$cardSetPosition];
    unset ($notZeroValue[$cardSetPosition]);
}

Output is 0000 (correct because the $notZeroValue has four elements and for each one $groupValue = 0)

I know there must be a newbie error because changing *100 to +100 produces key values 101, 102, 103, 104.

print_r($notZeroValue); //output = array()

I think you have to provide more information. Where is $groupValue defined? What does the array look like? What is the result you get and what is the result you expect? — Felix Kling
– Felix Kling, Commented Nov 22, 2011 at 13:41

codaddict · Accepted Answer · 2011-11-22 13:41:31Z

3

With $groupValue equal to 0 you are getting correct results because

$notZeroValue[$cardSetPosition + ($groupValue*100)] = $notZeroValue[$cardSetPosition];

becomes

$notZeroValue[$cardSetPosition] = $notZeroValue[$cardSetPosition];

which is overwriting the array value with itself.

Next you delete the element from array.

So at the end the array will be empty.

But when you change * to + and $groupValue still at 0:

$notZeroValue[$cardSetPosition + ($groupValue+100)] = $notZeroValue[$cardSetPosition];

you'll not be overwriting the array values, instead you'll be creating new key/value pairs where keys are 100 more than old keys. Next you delete the old key/value from the array. So at the end you've 4 new key/value pairs.

answered Nov 22, 2011 at 13:41

codaddict

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1 Comment

EnglishAdam Over a year ago

Ah! I hadn't realised that! Ok I'll add an if for when $groupValue == 0 THANKS!!

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