How to Parse Currency Strings in PHP with Multiple Locales?
Nov 13, 2024 am 03:13 AM
Parsing Currency Strings in PHP
When parsing currency strings in PHP, it can be challenging to handle varying decimal separators depending on the current locale. While using str_replace() to convert commas to dots can work for some cases, it relies on the assumption that the decimal separator is always a dot.
A More Robust Solution
To address this limitation and cater to multiple locales, a more complex but versatile solution is to employ regular expressions (regex). Here's how to do it:
public function getAmount($money)
{
$cleanString = preg_replace('/([^0-9\.,])/i', '', $money);
$onlyNumbersString = preg_replace('/([^0-9])/i', '', $money);
$separatorsCountToBeErased = strlen($cleanString) - strlen($onlyNumbersString) - 1;
$stringWithCommaOrDot = preg_replace('/([,\.])/', '', $cleanString, $separatorsCountToBeErased);
$removedThousandSeparator = preg_replace('/(\.|,)(?=[0-9]{3,}$)/', '', $stringWithCommaOrDot);
return (float) str_replace(',', '.', $removedThousandSeparator);
}
Explanation
- preg_replace() removes non-numeric characters and isolates the decimal separator.
- The count of separators is determined to remove them one at a time until only the decimal separator remains.
- The string is then cleaned up to remove thousand separators, and finally, a float value with the correct decimal separator is returned.
Caveats
- This method fails if the decimal part exceeds two digits.
- If dealing with such scenarios, consider using a library like currency-detector (https://github.com/mcuadros/currency-detector) for more comprehensive handling.
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