PHP String to Float

PHP String to Float

$rootbeer = (float) $InvoicedUnits;

Should do it for you. Check out Type-Juggling. You should also read String conversion to Numbers.

PHP: convert string to float (only if string represents a float)

You can use is_numeric() function to check variable which might contain a number.
For example:

$a = "1.23";
if (is_numeric($a)) {
    $a = (float)$a;
}

$b = "1.2 to 1.3";
if (is_numeric($b)) {
    $b = (float)$b;
}

var_dump([
    'a' => $a,
    'b' => $b
]);

Output

array (size=2) 'a' => float 1.23 'b' => string '1.2 to 1.3'
(length=10)

When I change the string into float I always get 0

Your problem is the content of $string.

In PHP, every time you convert a string to a float, be it by casting (float) $string, or floatval($string), you will always get 0 if the first character of the string is not numeric.

From PHP docs: String conversion to numbers

The value is given by the initial portion of the string. If the string starts with valid numeric data, this will be the value used. Otherwise, the value will be 0 (zero)

Double-check the content of $string. Probably you have some spurious characters at its beginning.

PHP convert String number with whitespace to Float

Most likely you have a non visible character as the thousand separator character. It's more safe to filter all characters except digits and . when sanitizing the input string. This can be achieved with the preg_replace function.

Your script can be modified to something like this:

$a = "3 999.99";
$b = "1 500.11";

$aa = floatval(preg_replace('/[^0-9.]/', '', $a));
$bb = floatval(preg_replace('/[^0-9.]/', '', $b));

$c = $aa - $bb;
echo $aa . ' - ' . $bb . ' = ' . $c;

Additionally, it's a bit dangerous and non exact to use floats when handling money in particular. Please have a look at this repository which helps a lot with this problem: https://github.com/moneyphp/money

PHP String to Float

$rootbeer = (float) $InvoicedUnits;

Should do it for you. Check out Type-Juggling. You should also read String conversion to Numbers.

PHP Convert String into Float/Double

Surprisingly there is no accepted answer. The issue only exists in 32-bit PHP.

From the documentation,

If the string does not contain any of the characters '.', 'e', or 'E' and the numeric value fits into integer type limits (as defined by PHP_INT_MAX), the string will be evaluated as an integer. In all other cases it will be evaluated as a float.

In other words, the $string is first interpreted as INT, which cause overflow (The $string value 2968789218 exceeds the maximum value (PHP_INT_MAX) of 32-bit PHP, which is 2147483647.), then evaluated to float by (float) or floatval().

Thus, the solution is:

$string = "2968789218";
echo 'Original: ' . floatval($string) . PHP_EOL;
$string.= ".0";
$float = floatval($string);
echo 'Corrected: ' . $float . PHP_EOL;

which outputs:

Original: 2.00
Corrected: 2968789218

To check whether your PHP is 32-bit or 64-bit, you can:

echo PHP_INT_MAX;

If your PHP is 64-bit, it will print out 9223372036854775807, otherwise it will print out 2147483647.

---

Related Topics