php函数无法返回值

Question

我无法从函数中获取值。 虽然我要打印的值，它显示旧值“8”。看来function validateInput（）不起作用。

$current_val = "8"; 
function validateInput() { 
     $db = JFactory::getDbo(); 
    //$search = $this->item->producer; 
    $query = " SELECT * FROM aua8l_djc2_after_reg_page "; 
    $db->setQuery($query); 
    $result = $db->query(); 
     if ($result->num_rows > 0) { 
      while($row = $result->fetch_assoc()) { 
       $curr = $row['type']; 
       global $current_val; 
        switch ($curr) { 
        case '1': 
         $current_val = "youtube"; 
         return $current_val; 
         //echo $current_val; 
         //return $GLOBALS['current_val']; 
         break; 
        case '2': 
         $current_val = "rdparty"; 
         //return $GLOBALS['current_val']; 
         break; 
        case '3': 
         $current_val = "thankyou"; 
         //return $GLOBALS['current_val']; 
         break; 
        } 
      } 
     } 
} 
echo $current_val; 

Answer 1

做的另一种方法是这样的：

$current_val = "8"; 

function validateInput() { 
    $db = JFactory::getDbo(); 
    $query = " SELECT * FROM aua8l_djc2_after_reg_page "; 
    $db->setQuery($query); 
    $result = $db->query(); 
    if ($result->num_rows > 0) { 
     while($row = $result->fetch_assoc()) { 
      $curr = $row['type']; 
      global $current_val; 
      switch ($curr) { 
       case '1': 
        $current_val = "youtube"; 
       break; 
       case '2': 
        $current_val = "rdparty"; 
       break; 
       case '3': 
        $current_val = "thankyou"; 
       break; 
      } 
     } 
     return $current_val; 
    } 
} 

现在你可以做任何

echo validateInput(); 

或

$current_val = validateInput();  

的d $current_val将是你想要的。

Answer 2

$current_val = "8"; 
$current_val = validateInput($current_val); 

function validateInput($current_val) { 
    $db = JFactory::getDbo(); 
//$search = $this->item->producer; 
$query = " SELECT * FROM aua8l_djc2_after_reg_page "; 
$db->setQuery($query); 
$result = $db->query(); 
    if ($result->num_rows > 0) { 
     while($row = $result->fetch_assoc()) { 
      $curr = $row['type']; 
      global $current_val; 
       switch ($curr) { 
       case '1': 
        $current_val = "youtube"; 
        return $current_val; 
        //echo $current_val; 
        //return $GLOBALS['current_val']; 
        break; 
       case '2': 
        $current_val = "rdparty"; 
        //return $GLOBALS['current_val']; 
        break; 
       case '3': 
        $current_val = "thankyou"; 
        //return $GLOBALS['current_val']; 
        break; 
       } 
     } 
    } 
} 
echo $current_val;