Convert a string to a double - is this possible?
PhpPhp Problem Overview
Just wondering in php, if it was possible to convert a string to a double. I am using a financial web service which provides a price as a string. I really need to process this as a double and was wondering how i would convert it
thanks
Php Solutions
Solution 1 - Php
Just use floatval().
E.g.:
$var = '122.34343';
$float_value_of_var = floatval($var);
echo $float_value_of_var; // 122.34343
And in case you wonder doubleval() is just an alias for floatval().
And as the other say, in a financial application, float values are critical as these are not precise enough. E.g. adding two floats could result in something like 12.30000000001 and this error could propagate.
Solution 2 - Php
For arbitrary precision mathematics PHP offers the Binary Calculator which supports numbers of any size and precision, represented as strings.
$s = '1234.13';
$double = bcadd($s,'0',2);
Solution 3 - Php
Use doubleval(). But be very careful about using decimals in financial transactions, and validate that user input very carefully.
Solution 4 - Php
Why is floatval the best option for financial comparison data? bc functions only accurately turn strings into real numbers.