PHP 8.4.2 Released!

    floatval

    (PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

    floatval — 获取变量的浮点值

    说明

    floatval(mixed $value): float

    获取变量 value 的 float 值。

    参数

    value

    可以是任何标量类型。floatval() 不能用于对象，这样做会发出 E_WARNING 级别的错误并返回 1。

    返回值

    指定变量的浮点值。空数组返回 0，非空数组返回 1。

    字符串很可能返回 0，尽管这取决于字符串最左边的字符。适用浮点数强制转换的通用规则。

    更新日志

    版本 说明
    8.0.0 对象转换时的错误级别已从 E_NOTICE 更改为 E_WARNING。

    示例

    示例 #1 floatval() 示例

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

    示例 #2 floatval() 最左边的字符为非数字的示例

    <?php
    $var     = 'The122.34343';
    $float_value_of_var = floatval($var);
    echo     $float_value_of_var; // 0
    ?>

    参见

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    ＋添加备注

    用户贡献的备注 22 notes

    up
    122
    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
    up
    57
    Anonymous
    19 years ago
    you can also use typecasting instead of functions:

    (float) $value;
    up
    22
    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)
    up
    27
    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

    ?>
    up
    19
    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
    ?>
    up
    8
    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);
    }
    ?>
    up
    2
    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"
    ?>
    up
    2
    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-]+$/"
    instead of: "/^[0-9]*[\.]{1}[0-9-]+$/"
    up
    3
    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)); ?>
    up
    1
    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
    up
    1
    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>";
    }
    ?>
    up
    0
    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"
    up
    0
    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.
    up
    -1
    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$') ;
    ?>
    up
    -1
    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)
    up
    -1
    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.
    up
    -1
    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').
    up
    -2
    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;
    }
    ?>
    up
    -1
    movila dot e dot v at gmail dot com
    8 years ago
    <?php
    $price     = '1.299,00 EUR';
    //$price = 'EUR 1.299,00';
    //$price = '$1,745.09';
    //$price = '$14';
    //$price = '$.14';


    function floatValue($str){
    if(    preg_match("/([0-9\.,-]+)/", $str, $match)){
    $value = $match[0];
    if(     preg_match("/(\.\d{1,2})$/", $value, $dot_delim) ){
    $value = (float)str_replace(',', '', $value);
    }
    else if(     preg_match("/(,\d{1,2})$/", $value, $comma_delim) ){
    $value = str_replace('.', '', $value);
    $value = (float)str_replace(',', '.', $value);
    }
    else
    $value = (int)$value;
    }
    else {
    $value = 0;
    }
    return     $value;
    }

    echo     floatValue($price);
    /*
    1.299,00
    1.299,00
    1,745.09
    14
    0.14
    */
    ?>
    up
    -2
    radler63 at hotmail dot com
    6 years ago
    I get the following disturbing results:
    var_dump string(10) "0.01333"
    echo the string=0.01333
    echo (float)string=0
    echo floatval(string)=0

    The string is an outcome of array_map('str_getcsv', file(...
    I can't find the characters 8-10

    thanks
    up
    -5
    info at marc-gutt dot de
    16 years ago
    <?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.
    up
    -4
    vickers at hotpop dot com
    20 years ago
    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
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