Conversão de Moedas

converteMoeda.php

<?php
$preco=Convert('USD', 'BRL','535,93');
if($preco!=false){
echo $preco;
}
else{echo "conversão não possível";}
	
	/**
	 * [Converte Moedas]
	 * @example http://www.google.com/finance/converter
	 * @param [string] $from  [description]
	 * @param [string] $to    [description]
	 * @param [string] $preco [description]
	 */
 	function Convert($from, $to, $preco)
    {   $url = "http://www.google.com/finance/converter?a=$preco&from=$from&to=$to";

        $data = getPage($url);    
        if(empty($data))
            return false;
       
        $dom = new DOMDocument();
        @$dom->loadHTML($data);       

        $return = @$dom->getElementById('currency_converter_result')
                    ->getElementsByTagName('span')
                    ->item(0)
                    ->firstChild
                    ->wholeText;

        $return =  (float)$return;       
        if($return == 0 )
            return false;
       
        return number_format($return,2);
    }
    
    /**
     * [getPage description]
     * @param  [type] $url [description]
     * @return [type]      [description]
     */
    function getPage($url)
    {   if(ini_get('allow_url_fopen') != 1) {
              @ini_set('allow_url_fopen', '1');
          }
           if(ini_get('allow_url_fopen') != 1) {
              $ch = curl_init();
              curl_setopt($ch, CURLOPT_URL,$url);
              curl_setopt($ch, CURLOPT_FAILONERROR, 1);
              curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
              curl_setopt($ch, CURLOPT_TIMEOUT, 3);
              $data = curl_exec($ch);
              curl_close($ch); 
            }  
            else {
            $data = file_get_contents($url);
            }  
      return $data;
      }