String Manipulator 1

<?php
$string = readline();
$input = readline();
while ($input!=='End'){
    $args = explode(" ", $input);
    $command = $args[0];
    switch ($command){
        case 'Translate':
            $char = $args[1];
            $replacement = $args[2];
            $string = str_replace($char,$replacement,$string);
            echo $string .PHP_EOL;
            break;

        case 'Includes':
            $subString = $args[1];
            str_replace($subString,'',$string,$count);
            if ($count>0){
                echo 'True' .PHP_EOL;
            } else{
                echo 'False' .PHP_EOL;
            }
            break;

        case 'Start':
            $subString = $args[1];
            if (strpos($string,$subString)==0){
                echo 'True' .PHP_EOL;
            }
            else{
                echo 'False' .PHP_EOL;
            }
            break;

        case 'Lowercase':
            $string = strtolower($string);
            echo $string .PHP_EOL;
            break;

        case 'FindIndex':
            $char = $args[1];
            $lastIndex= strrpos($string,$char);
            echo $lastIndex .PHP_EOL;
            break;

        case 'Remove':
            $startIndex = $args[1];
            $count = $args[2];
            $currentString = '';
            for($i = $startIndex; $i < $startIndex+$count; $i++) {
                $currentString .= $string[$i];
            }
            $string = str_replace($currentString,'',$string);
            echo $string .PHP_EOL;
            break;
    }

    $input=readline();
}