floatval
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
floatval — 変数の float 値を取得する
戻り値
指定した変数の float 値を返します。 空の配列の場合は 0、空でない配列の場合は 1 を返します。
文字列の場合、ほとんどは 0 を返しますが、先頭の文字が何であるかによってこれは変わります。 float 型へのキャスト と同じルールに従います。
例
例1 floatval() の例
<?php
$var = '122.34343The';
$float_value_of_var = floatval($var);
echo $float_value_of_var; // 122.34343
?>
例2 floatval() で、先頭が非数値である場合の例
<?php
$var = 'The122.34343';
$float_value_of_var = floatval($var);
echo $float_value_of_var; // 0
?>
＋add a note
User Contributed Notes 22 notes
brewal dot renault at gmail dot com ¶
10 years ago
This function takes the last comma or dot (if any) to make a clean float, ignoring thousand separator, currency or any other letter :
function tofloat($num) {
$dotPos = strrpos($num, '.');
$commaPos = strrpos($num, ',');
$sep = (($dotPos > $commaPos) && $dotPos) ? $dotPos :
((($commaPos > $dotPos) && $commaPos) ? $commaPos : false);
if (!$sep) {
return floatval(preg_replace("/[^0-9]/", "", $num));
}
return floatval(
preg_replace("/[^0-9]/", "", substr($num, 0, $sep)) . '.' .
preg_replace("/[^0-9]/", "", substr($num, $sep+1, strlen($num)))
);
}
$num = '1.999,369€';
var_dump(tofloat($num)); // float(1999.369)
$otherNum = '126,564,789.33 m²';
var_dump(tofloat($otherNum)); // float(126564789.33)
Demo : http://codepad.org/NW4e9hQH
Alexey M ¶
8 years ago
There is much easier way to deal with formatted numbers:
<?php
$str = '13,232.95';
$var = (double)filter_var($str, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
var_dump($var);
?>
double(13232.95)
PapaPinguoin ¶
13 years ago
To view the very large and very small numbers (eg from a database DECIMAL), without displaying scientific notation, or leading zeros.
FR : Pour afficher les très grand et très petits nombres (ex. depuis une base de données DECIMAL), sans afficher la notation scientifique, ni les zéros non significatifs.
<?php
function floattostr( $val )
{
preg_match( "#^([\+\-]|)([0-9]*)(\.([0-9]*?)|)(0*)$#", trim($val), $o );
return $o[1].sprintf('%d',$o[2]).($o[3]!='.'?$o[3]:'');
}
?>
<?php
echo floattostr("0000000000000001");
echo floattostr("1.00000000000000");
echo floattostr("0.00000000001000");
echo floattostr("0000.00010000000");
echo floattostr("000000010000000000.00000000000010000000000");
echo floattostr("-0000000000000.1");
echo floattostr("-00000001.100000");
// result
// 1
// 1
// 0.00000000001
// 0.0001
// 10000000000.0000000000001
// -0.1
// -1.1
?>
anonymous at start dot be ¶
20 years ago
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
?>
chris at georgakopoulos dot com ¶
15 years ago
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);
}
?>
secretr at NOSPAM dot e107 dot org ¶
13 years ago
setlocale() and floatval() duo could break your DB queries in a very simple way:
<?php
setlocale(LC_ALL, 'bg_BG', 'bgr_BGR');
echo floatval(0.15); // output 0,15
?>
You would need simple workaround like:
<?php
function number2db($value)
{
$larr = localeconv();
$search = array(
$larr['decimal_point'],
$larr['mon_decimal_point'],
$larr['thousands_sep'],
$larr['mon_thousands_sep'],
$larr['currency_symbol'],
$larr['int_curr_symbol']
);
$replace = array('.', '.', '', '', '', '');
return str_replace($search, $replace, $value);
}
setlocale(LC_ALL, 'bg_BG', 'bgr_BGR');
$testVal = floatval(0.15); // result 0,15
var_dump($testVal, number2db($testVal));
// Result:
// float(0,15)
// string(4) "0.15"
?>
aa at geb-team dot de ¶
18 years ago
@pillepop2003 at yahoo dot de
<?php
float('-100.00', array('single_dot_as_decimal' => true)); // whoops, returns -10000
?>
use: "/^[0-9-]*[\.]{1}[0-9-]+$/"
instead of: "/^[0-9]*[\.]{1}[0-9-]+$/"
steve at opilo dot net ¶
16 years ago
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)); ?>
pillepop2003 at yahoo dot de ¶
20 years ago
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
Michiel ¶
16 years ago
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>";
}
?>
T-Soloveychik at ya.ru ¶
7 years ago
Float value less than 0.0001 (0.0000999999999999995) will be converted by floatval to scientific notation (exponential notation):
<?php
var_dump(floatval(0.0000999999999999995)); # >> float(0,0001)
var_dump(floatval("0.000099")); # >> float(9.9E-5)
var_dump((string)floatval(0.000099)); # >> string(6) "9.9E-5"
pierpaolocira ¶
8 years ago
Be aware the last tofloat($num).
In theory it is very useful to have a function "separator-agnostic" (I think "locale based" solutions are useless if you have to parse a user file that can have a locale different to the server).
But this can lead to misinterpretations; in short: "123,456" is "123.456" (so comma used as decimal separator) or "123456" (comma used as thousand separator).
In any case, if you really want to use it, please don't forget that this function doesn't manage negative numbers.
zfcb13 at gmail dot com ¶
9 years ago
More elegant function with selection of decimal point (deafault ,):
<?php
function floatvaldec($v, $dec=',') { return floatval(ereg_replace("," , "." , ereg_replace("[^-0-9$dec]","",$v))); }
// examples:
echo '<br>'.floatvaldec('somthing123.456.789,12Euro') ;
echo '<br>'.floatvaldec('x123,456 789.12 Euro', '.') ;
echo '<br>'.floatvaldec('123.456 789,12$') ;
?>
Zipi ¶
21 years ago
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 ¶
21 years ago
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.
iliyazelenkog at gmail dot com ¶
6 years ago
(float) would be more performant here (up to 6x times faster).
intval, floatval, doubleval, strva for PHP4 functions (intval, floatval, doubleval, strval), in PHP5 use type casting construction (i.e. '(type) parameter').
leprau at leprau dot de ¶
17 years ago
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;
}
?>