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Modifier to cut insignificant zeros in value

 
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vl
Smarty n00b


Joined: 15 Jul 2004
Posts: 2
Location: Moscow,Russia

PostPosted: Sat Jan 29, 2005 7:52 pm    Post subject: Modifier to cut insignificant zeros in value Reply with quote

working with MySQL and DECIMAL type, i found that it always stores values with zeroes after decimal point, even if they are insignificant: for example, 10 is stored as 10.00. To avoid this on output, i wrote this modifier.

(It seems to me,that such conversion was possible with printf(), but i`m not sure ;-))

Code:

vl@vl plugins $ cat modifier.zero_cut.php
<?php

/**
   * Smarty insignificant zero cutter modifier plugin
   *
   * Type:     modifier<br>
   * Name:     zero_cut<br>
   * Purpose:  Format string, representing float value with given
   *           number of digits after decimal point with deletion
   *           of insignificant zeros.
   *
   * Example:  {$var|zero_cut:2} , where 2 is number of significant
   *                               digits after decimal point to show
   *           if number is 0(by default), function returns
   *           sprintf("%.0f",$str)
   *             
   *           input string must be separated with '.' symbol
   *
   * Date:     January 29,2005
   * @author   `VL <vl409@yandex.ru>
   * @version  1.0
   * @param string
   * @param integer
   * @return string
   *
   * Example output:
   *
   * 3     => 3
   * 3.    => 3
   * 3.0   => 3
   * 3.00  => 3
   * 3.000 => 3
   * 3.009 => 3.01
   * 3.003 => 3
   * 3.01  => 3.01
   * 3.10  => 3.1
   * 3.16  => 3.16
   *
   */

function smarty_modifier_zero_cut($str,$digits=0)
{
        # format value with given number of digits after decimal point
        $value=sprintf("%.${digits}f",$str);

        if(0==$digits)
                return $value;

        # break it in 2 parts
        list($left,$right)=explode (".",$value);

        # now we move the string, starting from the end
        # and counting how many insignificant zeros exists

        $len=strlen($right); # got length
        $k=0; # how many symbols to skip,starting from end of string
 {
                # found insignificant zero, increase counter
                if('0'==$right{$i})
                        $k++;
                else
                        break; # found insignificant digit, stop moving
        }

        # drop counted number of symbols at the end of string
        $right=substr($right,0,$len-$k);

        # if right part is not empty, add decimal point symbol
        if(""!=$right)
                $right=".$right";

        # return whole value
        return $left.$right;
}

?>

        for($i=$len-1;$i>=0;$i--)
 {
                # found insignificant zero, increase counter
                if('0'==$right{$i})
                        $k++;
                else
                        break; # found insignificant digit, stop moving
        }

        # drop counted number of symbols at the end of string
        $right=substr($right,0,$len-$k);

        # if right part is not empty, add decimal point symbol
        if(""!=$right)
                $right=".$right";

        # return whole value
        return $left.$right;
}

?>

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