Question

I have for cycle and there I create an array of names from the list, and what I need to do is remove duplicate values, then I get this array:

Array ( [0] => Tod [1] => Admin [2] => Tod )

    $c=count($_SESSION['cart']);

$list_array = array();

    for($i=0;$i<$c;$i++){
    $id=$_SESSION['list'][$i]['id'];
    $person=get_person($id);

   $list_array[] = $person;
}

Answer 1

Use array_unique, which returns a new array without duplicate values.

$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);

Outputs

Array
(
    [a] => green
    [0] => red
    [1] => blue
)

Check it out here.

However, you need to move $list_array outside of your for loop, and use that array in your conditionals like so,

$c=count($_SESSION['cart']);

// if this is in the loop, it will get overwritten
$list_array = array(); 

for($i=0;$i<$c;$i++){
    $id=$_SESSION['list'][$i]['id'];
    $person=get_person($id);

    // originally, you had $users_array in in_array and array_push
    if(!in_array($person, $list_array ))
        $list_array[] = $person;

}