Witam,

popełniłem kiedys taki oto prosty skrypt wymiany walut, w pierwszej częsci krótki opis, w drugiej kod źródłowy, w trzeciej wywołanie(tu zdaję sobie sprawę, że jest niechlujnie zrobione). Proszę o ocene kodu, opinie, komentarze.

1) Moduł ma sie połączyć z jakimś API wymiany walut (dowolne), pobrać kurs za dany dzien, przeliczyć i wyświetlić wynik. Wprowadzam kod ISO waluty (np USD), wybieram date, naciskam Convert - plugin pokazuje
mi przeliczona walute. Napisane proceduralnie.

2)

[PHP] pobierz, plaintext 
<?php
// main operating function, takes currency code id and chosen date
function currency($code, $chosen_date){
 
//if variables not empty function proceed
	if((!empty($code))&&(!empty($chosen_date))){
 
	//taking currency file id`s
		$exchange = explode("\n",file_get_contents('http://www.nbp.pl/kursy/xml/dir.txt'));
 
	//document as string
		foreach ($exchange as $exchange2) {
 
			$new_date= explode('-', $chosen_date);
			$y=$new_date[0];
			$y2= substr($y, 2,2);
 
			$dmonth= $new_date[1];
 
			$dday = $new_date[2];
			$mix=$y2;
			$mix.=$dmonth;
			$mix.=$dday;
 
			$year = '20'.substr($exchange2, 5,2);
			$month = substr($exchange2, 7,2);	
			$day = substr($exchange2, 9,2);
 
			//all currency files starts with a, also checking by date using strpos
			if((substr($exchange2,0,1)== 'a')&&(strpos($exchange2,$mix))) {
			 $K = $exchange2;} 
		}
	// if variable K is not set it means that there were no data from that day, currency value will be taken from previous day
		if(!isset($K)) {
				$chosen_date=strtotime($chosen_date);
				$chosen_date=$chosen_date - 86400;
				$chosen_date=date('Y-m-d', $chosen_date);
				 $chosen_date .'<br>';
				currency($code, $chosen_date);
				return 0;
		}
 
	//checing if variable $K is set, and rounding it up
		if(isset($K)){
		$K=trim($K);
		$date = 'http://www.nbp.pl/kursy/xml/'.$K.'.xml';
		}
 
 
		$ch = curl_init();
		//setting URL and options   
		curl_setopt($ch, CURLOPT_URL, $date);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		// due to setting CURLOPT_RETURNTRANSFER =true, curl_exec will return results
		$info = curl_exec($ch);
		$info = curl_exec($ch);
		//close cURL
		curl_close($ch);
 
		if(isset ($date)){
		$xml = new SimpleXMLElement($info);
 
			foreach($xml as $pozycja) {
 
			    $a = $pozycja->kod_waluty;
			    $b = $pozycja->kurs_sredni;
 
				if(strstr($a, $code)){
					echo '1 '. $a." on ".$chosen_date." was worth ". $b. " PLN <br>" ; 
				}
			};
		}
	}
        else echo "Please provide currency code and date.";
 
}
 
?>
[PHP] pobierz, plaintext 

3)

[HTML] pobierz, plaintext 
<?php
//view file used to take informations from user
 
//start time
$n=date('Y-m-d');
$d = strtotime($n);
$start_time=1325484000;
 
?>
<form action="NBPhistory.php" method="POST">
	<input type="text" name="code"/>
	<select name="datez">
	<option value="">Select date</option>
<?php
include './kurs.php';
for ($i=$start_time;$i<=$d+86400; $i=$i+86400){
	$w=date("Y-m-d",$i);
	echo '<option value='.$w.'>'.$w.' </option>';
	}
 echo '<input type="submit" value="Convert!"/></form>';
 
if (!isset($_POST['datez'])){
	$_POST['datez']='';
	}
$chosen_date =$_POST['datez'];
 
if (!isset($_POST['code'])){
	$_POST['code']='';
	}
 
$code= strtoupper($_POST['code']);
currency($code,$chosen_date);
?> 
[HTML] pobierz, plaintext