而foreach循環輸出兩次

Question

我只想循環輸出一次。相反，它輸出兩次。下面是代碼：

$results = mysql_query($query); 
    while ($c = mysql_fetch_array($results)){ 
     $individualPostcode = explode(",", $c['postcode']); 
     foreach($individualPostcode as $val){ 
      $val = trim($val); //Get rid of spaces 
      if($val === $postcode){ 
       echo $c['url']."<br>"; 
      } 
     } 
    } 
} 

這裏是輸出：

http://www.dyno.com/home-security/local-experts/greater-london/dyno-locks-and-alarms-enfield 
http://www.dyno.com/home-security/local-experts/greater-london/dyno-locks--alarms-enfield 
http://www.dyno.com/home-security/local-experts/greater-london/dyno-locks-and-alarms-enfield 
http://www.dyno.com/home-security/local-experts/greater-london/dyno-locks--alarms-enfield 

我試着取出foreach循環，但我需要去通過陣列檢查對用戶輸入。

這裏是$郵編的初始化：

$userInput = $_POST["input"]; 
if(strlen($userInput) < 4) 
    echo "User Input : ".$userInput."<br>"; 
else //Below gets the first three chars of the users string 
    echo "User Input : $userInput<br>What is being used : ".mb_substr($userInput, 0, 3)."<br>"; 

$postcode = mb_substr($userInput, 0, 3);  

Answer 1

您可以隨時創建網址的陣列來從如果URL已投入數組檢查複製阻止他們：

$results = mysql_query($query); 
$urlsArr = array(); 
while ($c = mysql_fetch_array($results)){ 
    $individualPostcode = explode(",", $c['postcode']); 
    foreach($individualPostcode as $val){ 
     $val = trim($val); //Get rid of spaces 
     if($val === $postcode){ 
      if (!in_array($c['url'], $urlsArr)) echo $c['url']."<br>"; 
      $urlsArr[] = $c['url']; 
     } 
    } 
} 

Answer 2

mysql_fetch_array回報都爲每個返回的結果的關聯和索引數組。 foreach循環將循環兩次並輸出兩次。嘗試使用mysql_fetch_assoc()

http://php.net/manual/en/function.mysql-fetch-array.php

更妙的是，嘗試移動到mysqli類。這是更快，mysql被depricated。

http://php.net/manual/en/intro.mysqli.php