Question

I have an array inside another and I would like to change a value in a key.

        //Obtenemos el numero de arrays
        $count = array();
        for($i = 0; $i < count($passer); $i++)
        {   
              if(array_key_exists($passer[1],$passer[$i])) {
              $passer[1] = "hola";
              }
             $count[] = $passer[$i];  
        }
        //return....
        return $count;

I need to change entries where the key is 1 and replace the value.
I have this array output:

array
(
     [0]=>array
          (
          [0]=>81278
          [1]=>87364
          [2]=>34923
          )
     [1]=>array
          (
          [0]=>81278
          [1]=>87364
          [2]=>34923
          )
)

but I get an error:

Warning: array_key_exists() [function.array-key-exists]:

Any idea what this means and what to do about it?

Answer 1

Several things you should change. First of all the way you write your for statement isn’t optimal, it will execute the count() function upon every iteration, make it like so

for($i = 0, $c = count($passer); $i < $c; $i++)

Second, your problem. You need to check the key, which in your case is static 1, in the array $passer[$i], so your array_key_exists() function should look like this

array_key_exists(1,$passer[$i])

array_key_exists expects the first parameter to be the key and second the array you wish to inspect