this function spells out numbers in english text.
number to words conversion.

“number to words” makes use of the built-in PHP functions is_numeric( ), fmod( ) and floor( ).

01 <?php
02 
03 $nwords = array(
04                 "zero", "one", "two", "three", "four", "five", "six", "seven",
05                 "eight", "nine", "ten", "eleven", "twelve", "thirteen",
06                 "fourteen", "fifteen", "sixteen", "seventeen", "eighteen",
07                 "nineteen", "twenty", 30 => "thirty", 40 => "forty",
08                 50 => "fifty", 60 => "sixty", 70 => "seventy", 80 => "eighty",
09                 90 => "ninety"
10             );
11  
12 function int_to_words($x)
13 {
14     global $nwords;
15     if(!is_numeric($x))
16     {
17         $w = '#';
18     }else if(fmod($x, 1) != 0)
19     {
20         $w = '#';
21     }else{
22         if($x < 0)
23         {
24             $w = 'minus ';
25             $x = -$x;
26         }else{
27             $w = '';
28         }
29         if($x < 21)
30         {
31             $w .= $nwords[$x];
32         }else if($x < 100)
33         {
34             $w .= $nwords[10 * floor($x/10)];
35             $r = fmod($x, 10);
36             if($r > 0)
37             {
38                 $w .= '-'. $nwords[$r];
39             }
40         } else if($x < 1000)
41         {
42             $w .= $nwords[floor($x/100)] .' hundred';
43             $r = fmod($x, 100);
44             if($r > 0)
45             {
46                 $w .= ' and '. int_to_words($r);
47             }
48         } else if($x < 1000000)
49         {
50             $w .= int_to_words(floor($x/1000)) .' thousand';
51             $r = fmod($x, 1000);
52             if($r > 0)
53             {
54                 $w .= ' ';
55                 if($r < 100)
56                 {
57                     $w .= 'and ';
58                 }
59                 $w .= int_to_words($r);
60             }
61         } else {
62             $w .= int_to_words(floor($x/1000000)) .' million';
63             $r = fmod($x, 1000000);
64             if($r > 0)
65             {
66                 $w .= ' ';
67                 if($r < 100)
68                 {
69                     $word .= 'and ';
70                 }
71                 $w .= int_to_words($r);
72             }
73         }
74     }
75     return $w;
76 }
77  
78 // demonstration
79 
80 if(isset($_POST['num']))
81 {
82     echo '
83     <p>the number reads '.int_to_words($_POST['num']).'</p>
84     <p><a href="./">try again</a></p>';
85 }else{
86     echo '
87     <form method="post" action="./">
88         <input type="text" name="num" />
89         <input type="submit" value="spell number" />
90     </form>';
91 }
92  
93 ?>