Number convert english to bangla

NumberFunction.php

<?php
function bangla2englishNumber ($number){
    $search_array= array("১", "২", "৩", "৪", "৫", "৬", "৭", "৮", "৯", "০");
    $replace_array= array("1", "2", "3", "4", "5", "6", "7", "8", "9", "0");
    $en_number = str_replace($search_array, $replace_array, $number);

    return $en_number;
}


function english2banglaNumber ($number){
    $search_array= array("1", "2", "3", "4", "5", "6", "7", "8", "9", "0");
    $replace_array= array("১", "২", "৩", "৪", "৫", "৬", "৭", "৮", "৯", "০");
    $bn_number = str_replace($search_array, $replace_array, $number);

    return $bn_number;
}

function EnglishtoBangla ($str)
{
    $convert = array (
        '0' => '০',
        '1' => '১',
        '2' => '২',
        '3' => '৩',
        '4' => '৪',
        '5' => '৫',
        '6' => '৬',
        '7' => '৭',
        '8' => '৮',
        '9' => '৯'
    );
    $newStr = '';
    for ($i = 0; $i < strlen ($str); $i++)
    {
        $char = substr ($str, $i, 1);
        if ($convert [$char])
        {
            $newStr .= $convert [$char];
        } else {
            $newStr .= $char;
        }
    }
    return $newStr;
}

?>