CodingForums.com - Add proper ending to number (st, nd, rd, th)

Page 1 of 2

Show 40 post(s) from this thread on one page

CodingForums.com (http://www.codingforums.com/index.php)

- Post a PHP snippet (http://www.codingforums.com/forumdisplay.php?f=41)

- - Add proper ending to number (st, nd, rd, th) (http://www.codingforums.com/showthread.php?t=186972)

tspek

01-17-2010 10:44 PM

Add proper ending to number (st, nd, rd, th)

I'm pretty sure (though it's very possible I'm wrong) that PHP doesn't have anything built in to do this outside of dates and I searched the internet and couldn't find anything worth a darn via google.

PHP Code:


		
			
#Adds st nd rd th to appropriate numbers
function number_ending ($number)
{
    // Get the last character of a string.
    $str = $number;
    $string = $str[strlen($str)-1];
    $j = 0;
    
    if ($string == 1)
    {
        $ending = "st";
        ++$j;
    }
    else if ($string == 2)
    {
        $ending = "nd";
        ++$j;
    }
    else if ($string == 3)
    {
        $ending = "rd";
        ++$j;
    }
     
    else if ($string == 11)
           {
                $ending = "th";
               ++$j;
           }

    else
    {
        $ending = "th";
        ++$j;
    }
    
    if ($j == 1)
    {
        $number = "$number"."$ending";
        return $number;
    }
}

oesxyl

01-17-2010 10:50 PM

PHP Code:


		
			
function number_ending ($number){
   $suff = array("","st","nd","rd","th");
   $index = intval($number);
   if($index > 4){
      $index = 4;
   }elseif($index < 1){
      $index = 0;
   }
   return ($number . $suff[$index]);
}

best regards

Zoic	01-17-2010 11:01 PM

I tried oesxyl's function and it stopped working at 21 and everything ended with "th".

I found the following code on http://www.talkphp.com/tips-tricks/2...ers-dates.html and it worked like a charm. :)

PHP Code:


		
			
<?php

function show_ordinal($num) {

    // first convert to string if needed

    $the_num = (string) $num;

    // now we grab the last digit of the number

    $last_digit = substr($the_num, -1, 1);

    // if the string is more than 2 chars long, we get

    // the second to last character to evaluate

    if (strlen($the_num)>1) {

        $next_to_last = substr($the_num, -2, 1);

    } else {

        $next_to_last = "";

    }

    // now iterate through possibilities in a switch

    switch($last_digit) {

        case "1":

            // testing the second from last digit here

            switch($next_to_last) {

                case "1":

                    $the_num.="th";

                    break;

                default:

                    $the_num.="st";

            }

            break;

        case "2":

            // testing the second from last digit here

            switch($next_to_last) {

                case "1":

                    $the_num.="th";

                    break;

                default:

                    $the_num.="nd";

            }

            break;

        // if last digit is a 3

        case "3":

            // testing the second from last digit here

            switch($next_to_last) {

                case "1":

                    $the_num.="th";

                    break;

                default:

                    $the_num.="rd";

            }

            break;

        // for all the other numbers we use "th"

        default:

            $the_num.="th";

    }



    // finally, return our string with it's new suffix

    return $the_num;

}

?>

(I searched for php number suffix in google)

tspek

01-17-2010 11:09 PM

*Edit*

I didn't see the other response. Assuming his doesn't work, mine would be the shortest yet, does that make a difference in terms of speed?

I also just realized that 11 would come out 11st...thus requiring another another if statement...

oesxyl

01-17-2010 11:12 PM

Quote:

Originally Posted by Zoic (Post 911531)

I tried oesxyl's function and it stopped working at 21

it work for me:

PHP Code:


		
			
<?php



function number_ending($number){

  $suff = array("","st","nd","rd","th");

  $index = intval($number);

  if($index > 4){

    $index = 4;

  }elseif($index < 1){

    $index = 0;

  }

  return ($number . $suff[$index]);

}



for($i=-1;$i<100;$i++){

  print number_ending($i) . "\n";

}



?>

Code:

-1

0

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

13th

14th

15th

16th

17th

18th

19th

20th

21th

22th

23th

24th

25th

26th

27th

28th

29th

30th

31th

32th

33th

34th

35th

36th

37th

38th

39th

40th

41th

42th

43th

44th

45th

46th

47th

48th

49th

50th

51th

52th

53th

54th

55th

56th

57th

58th

59th

60th

61th

62th

63th

64th

65th

66th

67th

68th

69th

70th

71th

72th

73th

74th

75th

76th

77th

78th

79th

80th

81th

82th

83th

84th

85th

86th

87th

88th

89th

90th

91th

92th

93th

94th

95th

96th

97th

98th

99th

Quote:

and everything ended with "th".

and what you expect to be instead th?

best regards

oesxyl

01-17-2010 11:15 PM

Quote:

Originally Posted by tspek (Post 911532)

I mess this too, :)

tspek

01-17-2010 11:16 PM

Quote:

Originally Posted by oesxyl (Post 911533)

it work for me:

[php]
and what you expect to be instead th?

best regards

33 would be 33rd not 33th.

oesxyl

01-17-2010 11:17 PM

just fix the problem:

PHP Code:


		
			
function number_ending ($number){

   $suff = array("","st","nd","rd","th");

   $index = intval($number) % 10;

   if($index > 4){

      $index = 4;

   }elseif($index < 1){

      $index = 0;

   }

   return ($number . $suff[$index]);

}

best regards

oesxyl

01-17-2010 11:24 PM

Quote:

Originally Posted by tspek (Post 911538)

33 would be 33rd not 33th.

same like what you post in #1, I also mess it and everything after 3 ends in th.
I fix this in #8. I don't know which is faster, mine is obvious shorter.

best regards

oesxyl

01-18-2010 12:22 AM

seems that previous was incorrect, see 11st, 12nd, 13rd vs. 11th, 12th, 13th:
Fixed:

PHP Code:


		
			
<?php

/*

 * seeAlso:

 *    http://en.wikipedia.org/wiki/Names_of_numbers_in_English#Ordinal_numbers

 *

 * 0, 1st, 2nd, 3rd, 4th, ...

 * 10th, 11th, 12th, 23th, ...

 * 20th, 21st, 22nd, 33rd, 34th

 */

function number_ending($number){

  $n = intval($number);

  $suff = array("","st","nd","rd","th");

  $index = $n % 10; // index ok for 0-9, i1-i9 (i > 2)

  if($index > 4 || ($index == 0 && $n > 0) || ($n > 10 && $n < 20)){

    $index = 4;

  }elseif($index < 1){

    $index = 0;

  }

  return ($number . $suff[$index]);

}



// test:

for($i=-1;$i<100;$i++){

  print number_ending($i) . "\n";

}



?>

best regards

kbluhm

01-18-2010 12:33 AM

PHP Code:


		
			
function ordinalize( $number )
{
    if ( is_numeric( $number ) && 0 <> $number )
    {
        if ( in_array( $number % 100, range( 11, 13 ) ) )
        {
            return $number . 'th';
        }
        switch ( $number % 10 )
        {
            case 1:  return $number . 'st';
            case 2:  return $number . 'nd';
            case 3:  return $number . 'rd';
            default: return $number . 'th';
        }
    }
    return $number;
}

tspek

01-22-2010 03:32 PM

I'm very new to PHP and programming in general. It's becoming increasingly clearer that there is more than one way to do just about anything and ultimately it comes down to using the most efficient method available.

The question then is how we know which way is the most efficient.

Here we have 3 functions that all do the same thing different ways, which one works the best though?

Fou-Lu

01-22-2010 04:16 PM

Thats trickier to answer. When it comes to algorithms, most of them can be calculated by an order of magnitude. Since these all have an O(1) magnitude, they are all technically as efficient from a magnitude view. Magnitude really only cares about the 'big' picture as a whole.

So, look at other factors. Datatypes are my primary concern. If you treat you're number as a string, you will waste time and resource, but looking at the last digit itself is a matter of a char lookup. So, should the number be interpreted as a string, any string > 4 characters in length has exceeded the memory size required for any number storable as an integer (and this will increase in PHP6 which is going to native unicode).

kbluhm and oesxyl have both ensured that they are working with numbers. Oesyxl's approach is slightly more efficient, but will not tell you if its actually a number (and therefore becomes untrappable). It doesn't care if you give it a string, if you do it will cast it to a number. I believe that the is_* functions are slightly less efficient than direct casting. The benifit is you can toss and trap errors associated with this approach.

Though the codes are negligable, efficiency wise I expect that oesxyl's will be slightly faster in execution time; however, like I mentioned there is little that can be done to trigger / throw and trap any errors from it since it technically cannot have any errors with the explicit casting. Oesxyl's appears to also waste a little more memory than kbluhm's method since it declares two local variables (since the third is a write-on-copy context).
Weight on weight, I'll bet if I tested these to benchmark on precision to 1000, they would come up identical. At 100000, I'd suspect to see a 5 - 8 variance, which is incredibly tiny.

Also, one more factor is readability. Efficiency is IMO tossable for readability in languages like PHP. We're not doing embedded microprocessing, so memory and cpu are not really an issue nowadays. You can certainly take a more readable approach so you can understand later what you've done without needing to walk through it step by step (from the above, kbluhm's is more readable than oesxyl's).

oesxyl

01-22-2010 04:18 PM

Quote:

Originally Posted by tspek (Post 913786)

depend of what do you mean by "works the best". :)

best regards

Cjwinnit

10-21-2011 05:44 PM

My thoughts:

PHP Code:


		
			
function ordinal ( $ordnum ) {

  $ordinalsuffixes = array("th","st","nd","rd");

  for($i=1;$i<=3;$i++) { if(($ordnum % 10 == $i) && ($ordnum % 100 != 10+$i )) return $ordinalsuffixes[$i]; }

return $ordinalsuffixes[0] ;    }

If you wanted an error-check you could insert this as the first line in the func.:

PHP Code:


		
			
  if(!((gettype($ordnum) == "integer") && ($ordnum > 0))) return false;

I think I win for the shortest code. Cookie? ;)

All times are GMT +1. The time now is 11:15 PM.

Page 1 of 2

Show 40 post(s) from this thread on one page