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floatval

leprau at leprau dot de
19-Jul-2007 09:26


For those of you, who are looking for a function that rips the first,

but longest possible float (or at least integer) from a string,

like 123.45 from the string "Price: 123,45$"



If no useable value is found, the function returns false.



Checks for both comma and dot as decimal-separator,

but does not check for 3 digits between thousands,

so 1,234.5 is as valid as 1,23,4.5 (both will return 1234.5)



12,.3 will return 12

1,000,000 will return 1000.0 !



(if thousands separator is defined,

decimals should be defined too ... 

in fact I was too lazy to check for that too)



Here you go, and feel free to optimize the function ;)

<?php

function getFloat($pString) {

    if (strlen($pString) == 0) {

            return false;

    }

    $pregResult = array();



    $commaset = strpos($pString,',');

    if ($commaset === false) {$commaset = -1;}



    $pointset = strpos($pString,'.');

    if ($pointset === false) {$pointset = -1;}



    $pregResultA = array();

    $pregResultB = array();



    if ($pointset < $commaset) {

        preg_match('#(([-]?[0-9]+(\.[0-9])?)+(,[0-9]+)?)#', $pString, $pregResultA);

    }

    preg_match('#(([-]?[0-9]+(,[0-9])?)+(\.[0-9]+)?)#', $pString, $pregResultB);

    if ((isset($pregResultA[0]) && (!isset($pregResultB[0]) 

            || strstr($preResultA[0],$pregResultB[0]) == 0 

            || !$pointset))) {

        $numberString = $pregResultA[0];

        $numberString = str_replace('.','',$numberString);

        $numberString = str_replace(',','.',$numberString);

    }

    elseif (isset($pregResultB[0]) && (!isset($pregResultA[0]) 

            || strstr($pregResultB[0],$preResultA[0]) == 0 

            || !$commaset)) {

        $numberString = $pregResultB[0];

        $numberString = str_replace(',','',$numberString);

    }

    else {

        return false;

    }

    $result = (float)$numberString;

    return $result;

}

?>

aa at geb-team dot de
04-Sep-2006 08:03


@pillepop2003 at yahoo dot de



<?php

float('-100.00', array('single_dot_as_decimal' => true)); // whoops, returns -10000

?>



use: "/^[0-9-]*[\.]{1}[0-9-]+$/"

instead of: "/^[0-9]*[\.]{1}[0-9-]+$/"

19-Apr-2005 05:30


you can also use typecasting instead of functions:



(float) $value;

pillepop2003 at yahoo dot de
14-Dec-2004 02:38


Use this snippet to extract any float out of a string. You can choose how a single dot is treated with the (bool) 'single_dot_as_decimal' directive.

This function should be able to cover almost all floats that appear in an european environment.



<?php



    function float($str, $set=FALSE) 

    {            

        if(preg_match("/([0-9\.,-]+)/", $str, $match))

        {

            // Found number in $str, so set $str that number

            $str = $match[0];

            

            if(strstr($str, ',')) 

            {

                // A comma exists, that makes it easy, cos we assume it separates the decimal part.

                $str = str_replace('.', '', $str);    // Erase thousand seps

                $str = str_replace(',', '.', $str);    // Convert , to . for floatval command

                

                return floatval($str);

            }

            else

            {

                // No comma exists, so we have to decide, how a single dot shall be treated

                if(preg_match("/^[0-9]*[\.]{1}[0-9-]+$/", $str) == TRUE && $set['single_dot_as_decimal'] == TRUE)

                {

                    // Treat single dot as decimal separator

                    return floatval($str);

                    

                }

                else

                {

                    // Else, treat all dots as thousand seps

                    $str = str_replace('.', '', $str);    // Erase thousand seps

                    return floatval($str);

                }                

            }

        }

        

        else

        {

            // No number found, return zero

            return 0;

        }

    }



// Examples



echo float('foo 123,00 bar'); // returns 123.00

echo float('foo 123.00 bar' array('single_dot_as_decimal'=> TRUE)); //returns 123.000

echo float('foo 123.00 bar' array('single_dot_as_decimal'=> FALSE)); //returns 123000

echo float('foo 222.123.00 bar' array('single_dot_as_decimal'=> TRUE)); //returns 222123000

echo float('foo 222.123.00 bar' array('single_dot_as_decimal'=> FALSE)); //returns 222123000



// The decimal part can also consist of '-'

echo float('foo 123,-- bar'); // returns 123.00



?>



Big Up.

Philipp

anonymous at start dot be
15-Jun-2004 07:00


Easier-to-grasp-function for the ',' problem.



function Getfloat($str) {

  if(strstr($str, ",")) {

    $str = str_replace(".", "", $str); // replace dots (thousand seps) with blancs

    $str = str_replace(",", ".", $str); // replace ',' with '.'

  }

  

  if(preg_match("#([0-9\.]+)#", $str, $match)) { // search for number that may contain '.'

    return floatval($match[0]);

  } else {

    return floatval($str); // take some last chances with floatval

  }

}



echo Getfloat("$ 19.332,35-"); // will print: 19332.35

thorcharAThotmailDOTcom
11-Mar-2004 12:40


Please note that conversion is not always correct, if you use a , instead of a . conversion wil return an integer on most servers.

vickers at hotpop dot com
26-Jan-2004 03:45


floatval() does not work with "$35,234.43", as it could not handle the '$' and the ','.  The following takes care of all values, such that only numeric and the decimal sign are input into floatval().  (It probably shows I'm an old 'c' guy)...this function only lightly tested.



function strtflt($str) {

    $il = strlen($str);

    $flt = "";

    $cstr = "";

    

    for($i=0;$i<$il;$i++) {

        $cstr = substr($str, $i, 1);

        if(is_numeric($cstr) || $cstr == ".")

            $flt = $flt.$cstr;

    }

    return floatval($flt);

}



Richard Vickers

vickers@hotpop.com

Zipi
25-Apr-2003 02:51


This function converts a string to a float no matter is the decimal separator dot (.) or comma (,). It also converts integers correctly. It takes the digits from the beginning of the string and ignores all other characters.



function floatval($strValue) {

   $floatValue = ereg_replace("(^[0-9]*)(\\.|,)([0-9]*)(.*)", "\\1.\\3", $strValue);

   if (!is_numeric($floatValue)) $floatValue = ereg_replace("(^[0-9]*)(.*)", "\\1", $strValue);

   if (!is_numeric($floatValue)) $floatValue = 0;

   return $floatValue;

  }



-Zipi (Finland)

jason at shadonet dot com
07-Mar-2003 07:07


Instead of using floatval which only appeared in PHP 4.2 you could juse use $variable = (float)$variable



This function doesn't seem to add any functionality that wasn't already there.

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floatval

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