floatval

(PHP 4 >= 4.2.0, PHP 5)

floatval -- 获取变量的浮点值

描述

float floatval ( mixed var )

返回变量 varfloat 数值。

var 可以是任何标量类型。你不能将 floatval() 用于数组或对象。

<?php
$var
= '122.34343The';
$float_value_of_var = floatval ($var);
print
$float_value_of_var; // 打印出 122.34343
?>

参见 intval()strval()settype()类型戏法


add a note add a note User Contributed Notes
aa at geb-team dot de
04-Sep-2006 11:03
@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 08:30
you can also use typecasting instead of functions:

(float) $value;
pillepop2003 at yahoo dot de
14-Dec-2004 06:38
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 10:00
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
12-Mar-2004 04:40
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
27-Jan-2004 07:45
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 05:51
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
08-Mar-2003 11:07
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.