Removing object from array; how to avoid nulls

Question

I have an array that is a object which I carry in session lifeFleetSelectedTrucksList I also have objects of class fleetUnit

class fleetUnit {
    public $idgps_unit = null;
    public $serial = null;
}

class lifeFleetSelectedTrucksList {
    public $arrayList = array();
}

$listOfTrucks = new lifeFleetSelectedTrucksList(); //this is the array that I carry in session
if (!isset($_SESSION['lifeFleetSelectedTrucksList'])) {
    $_SESSION['lifeFleetSelectedTrucksList'] == null; //null the session and add new list to it.
} else {
    $listOfTrucks = $_SESSION['lifeFleetSelectedTrucksList'];
}

I use this to remove element from array:

$listOfTrucks = removeElement($listOfTrucks, $serial);

And this is my function that removes the element and returns the array without the element:

function removeElement($listOfTrucks, $remove) {
    for ($i = 0; $i < count($listOfTrucks->arrayList); $i++) {
        $unit = new fleetUnit();
        $unit = $listOfTrucks->arrayList[$i];
        if ($unit->serial == $remove) {
            unset($listOfTrucks->arrayList[$i]);
            break;
        } elseif ($unit->serial == '') {
            unset($listOfTrucks->arrayList[$i]);
        }
    }
    return $listOfTrucks;
}

Well, it works- element gets removed, but I have array that has bunch of null vaues instead. How do I return the array that contains no null elements? Seems that I am not suing something right.

Use php.net/manual/en/function.array-filter.php

metalfight - user868766
– metalfight - user868766

2012-11-02 07:17:11 +00:00
Commented Nov 2, 2012 at 7:17 — metalfight - user868766
– metalfight - user868766, Commented Nov 2, 2012 at 7:17

deceze · Accepted Answer · 2012-11-02 07:21:26Z

3

I think what you mean is that the array keys are not continuous anymore. An array does not have "null values" in PHP, unless you set a value to null.

$array = array('foo', 'bar', 'baz');
// array(0 => 'foo', 1 => 'bar', 2 => 'baz');

unset($array[1]);

// array(0 => 'foo', 2 => 'baz');

Two approaches to this:

Loop over the array using foreach, not a "manual" for loop, then it won't matter what the keys are.
Reset the keys with array_values.

Also, removing trucks from the list should really be a method of $listOfTrucks, like $listOfTrucks->remove($remove). You're already using objects, use them to their full potential!

answered Nov 2, 2012 at 7:21

deceze♦

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Comments

metalfight - user868766 · Accepted Answer · 2012-11-02 07:19:40Z

1

You can use array_filter

<?php

$entry = array(
         0 => 'foo',
         1 => false,
         2 => -1,
         3 => null,
         4 => ''
      );

print_r(array_filter($entry));
?>

output:

Array
(
[0] => foo
[2] => -1
)

answered Nov 2, 2012 at 7:19

metalfight - user868766

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2 Comments

Andrew Over a year ago

Well, is this normal? Should unset leave nulls behind?

metalfight - user868766 Over a year ago

Nope, It should not give null with arrays.

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