empty
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;
}
?>
floatval
(PHP 4 >= 4.2.0, PHP 5)
floatval — Get float value of a variable
Parameters
- var
-
May be any scalar type. You cannot use floatval() on arrays or objects.
Return Values
The float value of the given variable.
Examples
Example #1 floatval() Example
<?php
$var = '122.34343The';
$float_value_of_var = floatval($var);
echo $float_value_of_var; // 122.34343
?>
add a note
User Contributed Notesfloatval
leprau at leprau dot de
19-Jul-2007 05:26
19-Jul-2007 05:26
aa at geb-team dot de
04-Sep-2006 04:03
04-Sep-2006 04:03
@pillepop2003 at yahoo dot de
<?php
float('-100.00', array('single_dot_as_decimal' => true)); // whoops, returns -10000
?>
use: "/^[0-9-]*[\.]{1}[0-9-]+$/"
instead of: "/^[0-9]*[\.]{1}[0-9-]+$/"
19-Apr-2005 01:30
you can also use typecasting instead of functions:
(float) $value;
pillepop2003 at yahoo dot de
14-Dec-2004 10:38
14-Dec-2004 10:38
Use this snippet to extract any float out of a string. You can choose how a single dot is treated with the (bool) 'single_dot_as_decimal' directive.
This function should be able to cover almost all floats that appear in an european environment.
<?php
function float($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 03:00
16-Jun-2004 03:00
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 08:40
11-Mar-2004 08:40
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 11:45
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.
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($flt);
}
Richard Vickers
vickers@hotpop.com
Zipi
25-Apr-2003 10:51
25-Apr-2003 10:51
This function converts a string to a float no matter is the decimal separator dot (.) or comma (,). It also converts integers correctly. It takes the digits from the beginning of the string and ignores all other characters.
function floatval($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 03:07
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.