how to remove values from $this php code example

Example 1: php delete element by value

$colors = array("blue","green","red");

//delete element in array by value "green"
if (($key = array_search("green", $colors)) !== false) {
    unset($colors[$key]);
}

Example 2: php remove element from array by value

// matrix array
foreach($appsList as $key => $app) {
            if($app["app_status"] !== "approved") {
                // remove orange apps
                unset($appsList[$key]);
            }
}