I am importing a file which has amount with different currency signs

£12.10
$26.13
€12.50

I need to import and convert this into single currency. I am splitting the string as follows

$parts = split(' ', preg_replace("/([0-9])/", ' ${1}', $amount, 1));

Couldn't make preg_split work with PREG_SPLIT_DELIM_CAPTURE

$parts = preg_split("/\d/", $amount, 2, PREG_SPLIT_DELIM_CAPTURE);

I have an array of currency sign to currency code

$currencySymbols = array('£'=>'GBP', '$'=>'USD','€'=>'EUR')

I need to 1. split the string into currency sign and value - if there is a better way then what i am doing 2. map the currency sign to currency code. Not able to map with $currencySymbols[$parts[0]]

Any help will be appreciated. (PHP 5.2.6) using charset=utf-8

Many thanks