php-function

<?php
        if(isset($_GET['commands']) && isset($_GET['delimiter']))
        {
            $input = $_GET['commands'];
            $delimiter = $_GET['delimiter'];

            $arr = explode("\n", $input);
            $arr = array_map('trim', $arr);
            $arrResult = array();

            for($i = 0; $i < count($arr); $i++)
            {
                $line = explode($delimiter, $arr[$i]);
                $command = $line[0];
                $value = intval($line[1]);

                if($command == "add")
                    $arrResult[] = $value;

                else
                    array_splice($arrResult, $value, 1);
            }

            foreach($arrResult as $element)
            {
                echo $element. "<br>";
            }
        }
    ?>