PHP Exercises: Convert word to digit

Last update on April 19 2025 11:50:43 (UTC/GMT +8 hours)

33. Convert Word to Digit

Write a PHP program to convert word to digit.

Input: zero;three;five;six;eight;one
Output: 035681

Sample Solution:

PHP Code:

<?php
// Function to convert words to digits
function word_digit($word) {
    // Explode the input string into an array based on the delimiter ';'
    $warr = explode(';', $word);
    
    // Initialize a variable to store the result
    $result = '';

    // Iterate over each word in the array
    foreach ($warr as $value) {
        // Switch statement to convert each word to its corresponding digit
        switch (trim($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 the final result
    return $result;
}

// Test cases
echo word_digit("zero;three;five;six;eight;one") . "\n";
echo word_digit("seven;zero;one") . "\n";
?>

Explanation:

Function Definition:

The word_digit($word) function is defined to convert a sequence of words representing numbers (e.g., "zero", "one") into their corresponding digits.

Split Input String:

The input string $word is split into an array $warr using explode(';', $word), with ; as the delimiter.

Initialize Result Variable:

A variable $result is initialized as an empty string to store the final digit sequence.

Iterate and Convert Words to Digits:

A foreach loop iterates through each word in $warr.
A switch statement checks each word (after trimming whitespace) and appends the corresponding digit to $result:

For example, if the word is "zero", 0 is appended; if "three", 3 is appended.

Return Result:

After the loop, the function returns $result, which now contains the converted digit sequence.

Test Cases:

The function is tested with two strings:

"zero;three;five;six;eight;one" outputs 035681.
"seven;zero;one" outputs 701.

The results are printed using echo.

Output:

035681                                                                 
701

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to convert a sentence containing number words into their numeric representation.
Write a PHP script to handle the conversion of mixed-case number words to a digit string.
Write a PHP script to process a CSV file of number words and output the corresponding digits.
Write a PHP script to reverse the conversion process by transforming a numeric string back into number words.

PHP Code Editor:

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