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floatval

(PHP 4 >= 4.2.0, PHP 5)

floatvalВозвращает значение переменной в виде числа с плавающей точкой

Описание

float floatval ( mixed $var )

Возвращает значение переменной var в виде числа с плавающей точкой float.

Список параметров

var

Может быть любого скалярного типа. Вы не можете применить floatval() к массивам или объектам.

Возвращаемые значения

Значение заданной переменной в виде числа с плавающей точкой.

Примеры

Пример #1 Пример использования floatval()

<?php
$var 
'122.34343The';
$float_value_of_var floatval($var);
echo 
$float_value_of_var// 122.34343
?>

Смотрите также


User Contributed Notes
floatval
chris at georgakopoulos dot com
29-Jul-2009 03:12
locale aware floatval:

<?php
function ParseFloat($floatString){
   
$LocaleInfo = localeconv();
   
$floatString = str_replace($LocaleInfo["mon_thousands_sep"] , "", $floatString);
   
$floatString = str_replace($LocaleInfo["mon_decimal_point"] , ".", $floatString);
    return
floatval($floatString);
}
?>
ted devito
10-Mar-2009 05:10
i noticed all (well, unless i missed something) the functions working with decimals destroy trailing decimal places. this function restores them in case you want to be able to display a consistent precision for users.

<?php
function decimal($val, $precision = 0) {
    if ((float)
$val) :
       
$val = round((float) $val, (int) $precision);
        list(
$a, $b) = explode('.', $val);
        if (
strlen($b) < $precision) $b = str_pad($b, $precision, '0', STR_PAD_RIGHT);
        return
$precision ? "$a.$b" : $a;
    else :
// do whatever you want with values that do not have a float
       
return $val;
    endif;
}
?>
info at marc-gutt dot de
26-Aug-2008 10:55
<?php
function floatvalue($value) {
     return
floatval(preg_replace('#^([-]*[0-9\.,\' ]+?)((\.|,){1}([0-9-]{1,2}))*$#e', "str_replace(array('.', ',', \"'\", ' '), '', '\\1') . '.\\4'", $value));
}
?>

It is much shorter and able to handle those one, too:
xx,-
xx,--
xx'xxx,xx

After using floatvalue() you can go forward with number_format() as usual.
Michiel
30-Jul-2008 12:21
The last getFloat() function is not completely correct.

1.000.000 and 1,000,000 and its negative variants are not correctly parsed. For the sake of comparing and to make myself clear I use the name parseFloat in stead of getFloat for the new function:

<?php
function parseFloat($ptString) {
            if (
strlen($ptString) == 0) {
                    return
false;
            }
           
           
$pString = str_replace(" ", "", $ptString);
           
            if (
substr_count($pString, ",") > 1)
               
$pString = str_replace(",", "", $pString);
           
            if (
substr_count($pString, ".") > 1)
               
$pString = str_replace(".", "", $pString);
           
           
$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;
}
?>

Comparing of float parsing functions with the following function:

<?php
function testFloatParsing() {
   
$floatvals = array(
       
"22 000,76",
       
"22.000,76",
       
"22,000.76",
       
"22 000",
       
"22,000",
       
"22.000",
       
"22000.76",
       
"22000,76",
       
"1.022.000,76",
       
"1,022,000.76",
       
"1,000,000",
       
"1.000.000",
       
"1022000.76",
       
"1022000,76",
       
"1022000",
       
"0.76",
       
"0,76",
       
"0.00",
       
"0,00",
       
"1.00",
       
"1,00",
       
"-22 000,76",
       
"-22.000,76",
       
"-22,000.76",
       
"-22 000",
       
"-22,000",
       
"-22.000",
       
"-22000.76",
       
"-22000,76",
       
"-1.022.000,76",
       
"-1,022,000.76",
       
"-1,000,000",
       
"-1.000.000",
       
"-1022000.76",
       
"-1022000,76",
       
"-1022000",
       
"-0.76",
       
"-0,76",
       
"-0.00",
       
"-0,00",
       
"-1.00",
       
"-1,00"
   
);
   
    echo
"<table>
        <tr>
            <th>String</th>
            <th>floatval()</th>
            <th>getFloat()</th>
            <th>parseFloat()</th>
        </tr>"
;
       
    foreach (
$floatvals as $fval) {
        echo
"<tr>";
        echo
"<td>" . (string) $fval . "</td>";
       
        echo
"<td>" . (float) floatval($fval) . "</td>";
        echo
"<td>" . (float) getFloat($fval) . "</td>";
        echo
"<td>" . (float) parseFloat($fval) . "</td>";
        echo
"</tr>";
    }
    echo
"</table>";
}
?>
steve at opilo dot net
21-Jul-2008 01:07
Most of the functions listed here that deal with $ and , are unnecessarily complicated. You can use ereg_replace() to strip out ALL of the characters that will cause floatval to fail in one simple line of code:

<?php $output = floatval(ereg_replace("[^-0-9\.]","",$input)); ?>
leprau at leprau dot de
19-Jul-2007 04:26
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 03:03
@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 12:30
you can also use typecasting instead of functions:

(float) $value;
pillepop2003 at yahoo dot de
14-Dec-2004 10:38
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
16-Jun-2004 02:00
Easier-to-grasp-function for the ',' problem.

<?php
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
?>
vickers at hotpop dot com
26-Jan-2004 11:45
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.

<?php
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 09:51
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.

<?php
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
08-Mar-2003 03:07
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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