PHP數學公式，E + 16？

Question

我在使這個公式返回正確的值時遇到了麻煩。根據Steam，等式Steam_community_number = (Last_part_of_steam_id * 2) + 76561197960265728 + Second_to_last_part_of_steam_id應返回64位Steam社區ID。目前，該等式正在返回7.6561198012096E+16。該公式應該返回76561198012095632，這在某種程度上與它已經返回的方式幾乎相同。我如何將返回的E + 16值轉換爲以上代碼中所述的正確值？謝謝。

function convertSID($steamid) { 
    if ($steamid == null) { return false; } 
    //STEAM_X:Y:Z 
    //W=Z*2+V+Y 
    //Z, V, Y 
    //Steam_community_number = (Last_part_of_steam_id * 2) + 76561197960265728 + Second_to_last_part_of_steam_id 
    if (strpos($steamid, ":1:")) { 
     $Y = 1; 
    } else { 
     $Y = 0; 
    } 
    $Z = substr($steamid, 10); 
    $Z = (int)$Z; 
    echo "Z: " . $Z . "</br>"; 
    $cid = ($Z * 2) + 76561197960265728 + $Y; 
    echo "Equation: (" . $Z . " * 2) + 76561197960265728 + " . $Y . "<br/>"; 
    return (string)$cid; 
} 

我打電話來與$cid = convertSID("STEAM_0:0:25914952");

這個功能如果你想看到的輸出的一個例子，檢查這裏：http://joshua-ferrara.com/hkggateway/sidtester.php

Answer 1

變化

return (string)$cid; 

到

return number_format($cid,0,'.',''); 

請注意，這將返回一個字符串，並且如果您對其執行任何數學運算，它將轉換回浮點數。 http://www.php.net/manual/en/book.bc.php

編輯：你的功能轉換爲使用bcmath時：

function convertSID($steamid) { 
    if ($steamid == null) { return false; } 
    //STEAM_X:Y:Z 
    //W=Z*2+V+Y 
    //Z, V, Y 
    //Steam_community_number = (Last_part_of_steam_id * 2) + 76561197960265728 + Second_to_last_part_of_steam_id 

    $steamidExploded = explode(':',$steamid); 
    $Y = (int)steamidExploded[1]; 
    $Z = (int)steamidExploded[2]; 
    echo "Z: " . $Z . "</br>"; 
    $cid = bcadd('76561197960265728 ',$Z * 2 + $Y); 
    echo "Equation: (" . $Z . " * 2) + 76561197960265728 + " . $Y . "<br/>"; 
    return $cid; 
}