Exchange Rates

exchange_rate.php

<?php

function exchange_rate($_opt = [])
{
	$_pairs = [];
	foreach($_opt as $_k=>$_v)
	{
		$_pairs[] = $_k.'_'.$_v;
	}
	if(!count($_pairs)) return null;
	$_pair = implode(',', $_pairs);
	$_url = 'http://free.currencyconverterapi.com/api/v5/convert?q='.$_pair.'&compact=y';
	
	$a_json = json_decode( file_get_contents($_url), true);
	
	$_res = [];
	foreach($a_json as $_k => $_v)
	{
		$_res[$_k] = number_format($_v['val'], 2, '.', '');
	}
	
	return ($_res);
}

//Examples:
print_r( exchange_rate(['EUR'=>'USD','USD'=>'EUR']) );
print_r( exchange_rate(['EUR'=>'RUB']) );
print_r( exchange_rate(['EUR'=>'TRY']) );