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gw-numbers-to-words.php

<?php
add_filter( 'gform_merge_tag_filter', 'convert_number_to_words_modifier', 10, 4 );

function convert_number_to_words_modifier( $value, $merge_tag, $modifier, $field ) {
 
    // Check if the modifier is "words"
    if ( $modifier == 'words' ) {
 
        // Convert the numeric value to words
        $value = convert_number_to_words( $value );
 
    }
 
    // Return the modified value
    return $value;
}

function convert_number_to_words( $number ) {
 
    // Array of numbers as words
    $numbers_as_words = array(
        0 => 'zero',
        1 => 'one',
        2 => 'two',
        3 => 'three',
        4 => 'four',
        5 => 'five',
        6 => 'six',
        7 => 'seven',
        8 => 'eight',
        9 => 'nine',
    );
 
    // Convert the number to a string
    $number_string = (string) $number;
 
    // Initialize the output string
    $output = '';
 
    // Split the number into its individual digits
    $digits = str_split( $number_string );
 
    // Loop through the digits
    foreach ( $digits as $digit ) {
 
        // Add the word for this digit to the output string
        $output .= $numbers_as_words[ $digit ] . ' - ';
 
    }
 
    // Remove the last hyphen from the output string
    $output = rtrim( $output, ' - ' );
 
    // Return the output string
    return $output;
 
}