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我有另一个程序员写的这个函数，但他很久以前就退出了。

我试图理解他写的这个函数，但我并不完全理解它。

它从csv 文件中获取一个令牌，数量应该取决于我选择的数量。但是force_plaform变量的作用是什么？还有$_GET x 参数和$_COOKIE x 参数有什么作用？

// Get a purchaselink from a given token (if one exists) and a given csv
function getPurchaseLink($token, $csvfile, $force_platform = "", $quantity = 1)
{
$fp = fopen($csvfile, 'r', true);
$columns = fgetcsv($fp, 1024, ',');

while (($row = fgetcsv($fp, 1024, ","))) {
    $row = array_combine($columns, $row);
    if ($row['purchaseToken'] == $token) {
        $purchaseLink = $row;
        break;
    }
}

// Default to pucharse link
$url = http://www.purchase.com//?p1=zzM5X9k4dF%2BDzrTnixoaKw3Fg7wZ8h5pkjp%2BLEidTXBg40xOjcFj5PtPlQniMskLm0W3ti65mE2KafUifZe9dZAcE&ref=purchase.com&style=146&ga=UA-2689090-1&C1=C01507;1;0&C2=C0508;0;0;
if ($url) {     
  // Convert GET x-parameters to cmp, mkey1 and mkey2 if they are present
  $append = "";
  if((isset($_GET["x-source"])) && ($_GET["x-source"] != "")) {
    $append = "&cmp=source_" . $_GET["x-source"];
    $nextParameter = "x-" . $_GET["x-source"];
    $counter = 1;
    $searching = TRUE;
    while(($searching) && ($counter <= 2)) {
      if((!isset($_GET[$nextParameter])) || ($_GET[$nextParameter] == "")) {
        $searching = FALSE;
      }
      else {
        $append .= "&mkey" . $counter . "=" . str_replace("x-", "", $nextParameter) . "_" . $_GET[$nextParameter];
        $nextParameter = "x-" . $_GET[$nextParameter];
    $counter += 1;
      }
    }
  }
  // Convert COOKIE x-parameters to cmp, mkey1 and mkey2 if they are present and there are no GET x-parameters
  if(($append == "") && (isset($_COOKIE["x-source"])) && ($_COOKIE["x-source"] != "")) {
    $append = "&cmp=source_" . $_COOKIE["x-source"];
    $nextParameter = "x-" . $_COOKIE["x-source"];
    $counter = 1;
    $searching = TRUE;
    while(($searching) && ($counter <= 2)) {
      if((!isset($_COOKIE[$nextParameter])) || ($_COOKIE[$nextParameter] == "")) {
        $searching = FALSE;
      }
      else {
        $append .= "&mkey" . $counter . "=" . str_replace("x-", "", $nextParameter) . "_" . $_COOKIE[$nextParameter];
        $nextParameter = "x-" . $_COOKIE[$nextParameter];
    $counter += 1;
      }
    }
  }
  // Return upclick purchase link   
  return $url . $append;
}

if ($quantity != 1) {
    $url .= "&quantity=" . $quantity;
}

// Pass on tracking parameters from URI query and cookies
$append = "";
foreach($_GET as $parameter => $value) {
    if(strpos($parameter, "x-") === 0 || $parameter == "tracking" || $parameter == "serial" || $parameter == "affiliate") {
        $append .= "&" . $parameter . "=" . $value;
    }
}
if (empty($append)) {
    foreach($_COOKIE as $parameter => $value) {
        if(strpos($parameter, "x-") === 0) {
            $append .= "&" . $parameter . "=" . $value;
        }
    }
}

$append = str_replace("x-tracking", "tracking", $append);
$append = str_replace("x-affiliate", "affiliate", $append);
$append = str_replace("&serial=", "&x-serial=", $append);

return $url . $append;
 }
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1 回答 1

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该函数正在构建一个查询字符串 (URL) 并返回它。程序调用该 URL 后所做的事情不取决于此代码，而是取决于被调用页面上的代码。此代码仅生成一个 URL。至于force_plaform，它似乎根本没有在函数中使用（只是在函数头中）。它是一个未使用的变量。至于$_GETand$_COOKIE变量，代码只是检查它们是否存在，如果存在则将它们附加到查询字符串中。

于 2013-01-30T15:45:36.987 回答