check php post value is numeric and well formatted

Question

I need to check POST value is numeric and well formatted. My expected format is

number.number
1.0
11.5

If POST value comes without .(DOT) only 1 then I would want that php convert that to 1.0

I tried this code but it doesn't work.

$foo = '2';
$foo = preg_match('/\\d{2}\\:\\d{2}\\.\\d{2}/', $foo);

Thanks :)

not sure how many decimal places you're dealing with but number_format() could work — Funk Doc, Jan 03 '17 at 17:58

score 1 · Accepted Answer · answered Jan 03 '17 at 19:07

1

Working code

//$value = '22';
$value = $_POST["input_value"];
if (is_numeric($value)) {

    $new_value = number_format($value, 1);

} else {

    $new_value = "$value is not numeric. <br>";

}

echo $new_value;

answered Jan 03 '17 at 19:07

romeo

68
1
1
8

score 0 · Answer 2 · edited May 23 '17 at 11:46

You basically want to check if the variable from the POST array is a float/double or not (float/double is a type of number in the format of x.x).

Cheking if a string is a float/double number

To do that, use this php built-in function: is_double or more accurate:is_float, that will tell you if the string is a float/double.

Checking if a string is an integer and converting it to a double/float value

If it's not a double, check if it's an integer (regular number): is_int, and if it's indeed an int, cast it to double by using number_format, look at the usage here: integer to double/float in php.

Example

$final_value;
$value = $_POST["wanted_value"];
if (is_float($value))
{
    $final_value = $value;
}
else if (is_int($value))
{
    $final_value = number_format($value, 1); // or 2 instead of 1 (2.0 or 2.00)
}
else
{
    $final_value = "ERROR";
}

Hope this helps!

check php post value is numeric and well formatted

2 Answers2