/**
* Returns request variable as explicit float value, or null if the request variable is not set or does not
* represent a float value.
* @param string $key Key in the collection storing the value to look up.
* @param int $index Index of the array to look up, if the variable's value is an array.
* @param array $src Array to search for $key, e.g. $_GET or $_POST
* @return float|null
*/
public static function parseFloatInput($key, $index = null, $src = null)
{
$value = Validation::parseNumericInput($key, $index, $src);
if ($value !== null) {
return (double) $value;
}
return null;
}
