Introduction

PHP is a server scripting language, and It is a powerful tool for making interactive and dynamic Web-pages. I have used WampServer 2.2 for following excercise..

<?php
function word_digit($word) {
    $warr = explode(';',$word);
    $result = '';
    foreach($warr as $value){
        switch(trim($value)){
            case 'zero':
                $result .= '0';
                break;
            case 'one':
                $result .= '1';
                break;
            case 'two':
                $result .= '2';
                break;
            case 'three':
                $result .= '3';
                break;
            case 'four':
                $result .= '4';
                break;
            case 'five':
                $result .= '5';
                break;
            case 'six':
                $result .= '6';
                break;
            case 'seven':
                $result .= '7';
                break;
            case 'eight':
                $result .= '8';
                break;
            case 'nine':
                $result .= '9';
                break;    
        }
    }
    return $result;
}
 
echo word_digit("nine;five;three;one;six;eight")."<br>";
echo word_digit("one;five;eight")."\n";
?>

Result