ceil

add a note User Contributed Notes

rjones at i-ps dot net
05-Mar-2006 08:19


To eliftymes below:



To check if a numer is divisible by another number just check if the modulus is zero:



if ($bigger_number % $lower_number == 0)

{

    echo "Can be wholey divided<br />";

}

else

{

    echo "Not wholey divisible";

}

tom pittlik
28-Feb-2006 08:02


ceil() is a useful way to quickly format bogus shopping cart quantities:



<?



ceil("str"); // 0

ceil("001"); // 1

ceil("0.1"); // 1

ceil("a34"); // 0

ceil("2fg"); // 2

ceil("$%%"); // 0



?>

eliftymes at gmail dot com
24-Feb-2006 04:20


Here's a little function I wrote that checks if a number is divisible by another number.



function check_divisible($number, $divider) {

 if(ceil($number/$divider) == $number/$divider) {

   return TRUE;

 } else {

   return FALSE;

 }

}



Useage would be as so.



$bigger_number=10;

$smaller_number=2;

if(check_divisible($bigger_number, $smaller_number)) {

 echo "$bigger_number is divisible by $smaller_number!";

} else {

 echo "$bigger_number is NOT divisible by $smaller_number!";

}



It's possible uses would be for:



Every 3rd, fourth, fifth, or whatever row in a table could be treated uniquely



Simple games...



Teaching your little kid math.

ermolaeva_elena at mail dot ru
20-Dec-2005 11:27


To round a number up to the nearest power of 10,

I've used

= ceil(intval($val)/10)*10;

nobody
23-Nov-2005 01:00


Here's a more simple one to do ceil to nearest 10:



function ceilpow10(val) {

   if (val % 10 == 0) return val;

   return val + (10 - (val % 10));

}

schmad at miller dash group dot net
19-Apr-2005 12:38


To round a number up to the nearest power of 10 use this simple procedure:



$multiplier = .1;

while($number>1)

{

    $number /= 10;

    $multiplier *= 10;

}

$number = ceil($number) * $multiplier;

coxswain at navaldomination dot com
17-Mar-2005 06:06


steve_phpnet // nanovox \\ com wouldn't:



<?php

$ceil  = ceil(4.67 * 10) / 10;

?>



work just as well?

steve_phpnet // nanovox \\ com
01-Mar-2005 04:40


I couldn't find any functions to do what ceiling does while still leaving I specified number of decimal places, so I wrote a couple functions myself.  round_up is like ceil but allows you to specify a number of decimal places.  round_out does the same, but rounds away from zero.



<?php

 // round_up:

 // rounds up a float to a specified number of decimal places

 // (basically acts like ceil() but allows for decimal places)

 function round_up ($value, $places=0) {

  if ($places < 0) { $places = 0; }

  $mult = pow(10, $places);

  return ceil($value * $mult) / $mult;

 }



 // round_out:

 // rounds a float away from zero to a specified number of decimal places

 function round_out ($value, $places=0) {

  if ($places < 0) { $places = 0; }

  $mult = pow(10, $places);

  return ($value >= 0 ? ceil($value * $mult):floor($value * $mult)) / $mult;

 }



 echo round_up (56.77001, 2); // displays 56.78

 echo round_up (-0.453001, 4); // displays -0.453

 echo round_out (56.77001, 2); // displays 56.78

 echo round_out (-0.453001, 4); // displays -0.4531

?>

sven at plus dot hr
10-Feb-2005 07:59


function roundaway($num) {

switch($num) {

case ($num > 0):

$n = ceil($num);

break;

case ($num < 0):

$n = floor($num);

break;

case ($num == 0):

$n = 0;

break;

}

return $n;

}

aaron at mind-design dot co dot uk
22-Jul-2004 04:10


Or for the terniary fans:



<?php



function roundaway($num) {

   return(($num > 0) ? ceil($num) : floor($num));

}



?>



Slightly pointless, but there you have it, in one line only..

rainfalling at yahoo dot com
22-Apr-2004 08:51


IceKarma said: "If you want, say, 2.6 to round to 3, and -2.6 to round to -3, you want round(), which rounds away from zero."



That's not always true. round() doesn't work that way, like zomis2k said it just rounds up _or_ down to the nearest non-decimal number. However this should work.



<?php



function roundaway($num) {

    if ($num > 0)

      return ceil($num);

    elseif ($num < 0)

      return floor($num);

    elseif ($num == 0)

      return 0;

}



?>

roger_dupere at hotmail dot com
10-Nov-2003 06:02


Here is a navbar using the ceil function.





<?php


 function navbar($num_rows,$page,$link) {


   $nbrlink = 10; /* Number of link to display per page */


   $page = (int) $page; /* Page now displayed */


   $num_rows = (int) $num_rows;





   if( $num_rows > 0 ) {


     $total_page = ceil( $num_rows / $nbrlink );





     for( $i=1;$i<$total_page+1;$i++ ) {


       if( $i == $page ) {


         $ret .= " <b>$i</b> ";


       } else {


         if( strstr( $link,"?" ) ) {


           $ret .= " <a href=\"$link&page=$i\">$i</a> ";


         } else {


           $ret .= " <a href=\"$link?page=$i\">$i</a> ";


         }


       }


     }





     return $ret;


   }


 }


  /* Let say that $num_rows content the numbre of rows of your sql query */


  $navbar = navbar( $num_rows, $page, "listmovie.php?id=$id" );





  if( $navbar != null || $navbar != "" ) {


    print( "<p><div align=\"center\">$navbar</div></p>" );


  }


?>

zomis2k at hotmail dot com
23-May-2003 02:24


>If you want, say, 2.6 to round to 3, and -2.6 to round to -3, you want round(), which rounds away from zero.



round() does not always round away from zero

round(2.4) = 2

round(2.6) = 3

round(-2.4) = -2

round(-2.6) = -3



round() rounds number to nearest non-decimal number.

IceKarma
22-Apr-2003 08:31


ceil() rounds towards positive infinity ("up"), floor() rounds towards negative infinity ("down").



If you want, say, 2.6 to round to 3, and -2.6 to round to -3, you want round(), which rounds away from zero.

clx at deim dot net
12-Jun-2002 04:55


<?php


echo ceil(2.6); // will output "3"


echo ceil(-2.6); // will output "-2"


?>

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ceil

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