Unsetting an array

[thomashw]

Is it possible to unset an array so the key that is being unset is deleted and all others move back one?

 

For instance:

 

If you had an array which contained planes[1], planes[2], planes[3], etc.

 

And you deleted planes[2], then planes[3] would become planes[2].

 

Making the array to be just planes[1], planes[2], etc.

 

I'm thinking it's possible because I know it's possible in C++.

 

Thanks!

[Caesar]

<?php

   $planes = array('one', 'two', 'three');
   unset($planes[1]);
?>

 

That results in...

 

Array
(
    [0] => one
    [1] => three
)

[Caesar]

I'll add that you can pretty much do what you want with the values in an array. So yes, you can do what you want. If you defined the keys in the array, you can redefine them.

[thomashw]

I have the following code:

 

unset ($_SESSION['name'][$number]);

 

$number is whichever array is being unset. So if number = 1, then 0 and 2 still exist but 1 is erased (and 2 doesn't come down to 1.)

[Jeremysr]

This might work:

 

function array_remove($array, $removed_key) {
     $new_array = array();
     foreach ($array as $key => $value) {
          if ($key != $removed_key) {
               array_push($new_array, $value);
          }
     }
     return $new_array;
}

$_SESSION['name'] = array_remove($_SESSION['name'], $number);

[thomashw]

Thanks for the function.

 

I'm just bewildered there isn't a preset function that will do this. Unless I'm using "unset" incorrectly.

[thomashw]

I found the function array_values(); does the job - for anyone who sees this in the future! The function goes through the array and indexes everything numerically.

 

So after using the unset(); function, the array_values(); function can be used to completely remove the key from the array and put everything back in order.