php array_push() -> How not to push if the array already contains the value

Question

I am using the following loop to add items to an an array of mine called $liste. I would like to know if it is possible somehow not to add $value to the $liste array if the

Answer 1

I have another solution for you! You can use keys as values And keys will never be duplicated.

$arr = ["A" => true, "B" => true, "C" => true];

$item = "A";
$arr[$item] = true;

Usage:

foreach($arr as $value => $helper){
    echo $value;
}

Set class

OK, Let me write a class for you! The arrays do not allow duplicated items are called sets.

class Set{
    private $countainer;

    public function get(){
        return $this->container;
    }
    public function push($item){
        $this->container[$item] = true;
    }
    public function delete($item){
        unset($this->container[$item]);
    }
}

Note: This will not work for associative arrays and values.