<?php
 
function smallNumberToText($number) {
 
    $spelling = array(
        0   =>  'ноль',                                     10  =>  'десять',       100 =>  'сто',
        1   =>  'один',         11  =>  'одиннадцать',      20  =>  'двадцать',     200 =>  'двести',
        2   =>  'два',          12  =>  'двенадцать',       30  =>  'тридцать',     300 =>  'триста',
        3   =>  'три',          13  =>  'тринадцать',       40  =>  'сорок',        400 =>  'четыреста',
        4   =>  'четыре',       14  =>  'четырнадцать',     50  =>  'пятьдесят',    500 =>  'пятьсот',
        5   =>  'пять',         15  =>  'пятнадцать',       60  =>  'шестьдесят',   600 =>  'шестьсот',
        6   =>  'шесть',        16  =>  'шестнадцать',      70  =>  'семьдесят',    700 =>  'семьсот',    
        7   =>  'семь',         17  =>  'семнадцать',       80  =>  'восемьдесят',   800 =>  'восемьсот',
        8   =>  'восемь',       18  =>  'восемнадцать',     90  =>  'девяносто',     900 =>  'девятьсот',
        9   =>  'девять',       19  =>  'девятнадцать'    
    );
 
    $femaleSpelling = array(
        1   =>  'одна',        2   =>  'две'
    );
    $from1to900 = '#^[1-9]0?0?$#';
    $from11to19 = '#^[11-19]$#';
    $first; $second; $third;
    $res = "";
 
    if ($number == 0){
    	return $spelling[$number];
    }
    elseif(preg_match($from1to900, $number)){
    	return $spelling[$number];
    }
    elseif(preg_match($from11to19,$number)){
    	return $spelling[$number];
    }
    else{
    	$first = floor($number / 100)*100;
    	$second = floor(($number - $first)/10)*10;
    	$third = $second -(floor($second/10) * 10);
    	if(($first != 0)&&($second != 0)&&($third != 0)){
    		$res = $spelling[$first]." ".$spelling[$second]." ".$spelling[$third];
    	}
    	return $res;
 
    }
}
$num = 423;
$small = smallNumberToText($num);
echo $small;
 

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