未定义的变量：行

Question

我得到了一个函数，它从我的数据库中请求一些信息，将它放入一个数组并将其返回。 sql语句是正确的。

当在数据库中找不到当前日期时，我想在我的网站上显示一个错误。 错误消息，也被添加到返回数组中。

首先我用COUNT检查数据库中是否存在相应的日期，如果count == 1，我用另一个语句从数据库中获取所有数据。如果count！= 1，我将一个数组硬编码放在一起。

当日期是在相同的给定参数的数据库中找到，该脚本用得好好的，但是当我更改日期在数据库中，我得到以下错误：

Notice: Undefined variable: row in /Applications/MAMP/htdocs/models/funcs.php on line 1257

1252年至1257年

线：

while($stmt->fetch()) 
      { 
       $row[] = array('id' => $id, 'datum' => $datum, 'mac' => $mac, 'ipad' => $ipad, 'iphone' => $iphone, 'imember' => $imember, 'applecare' => $applecare, 'verkoop_ochtend' => $verkoop_ochtend, 'verkoop_middag' => $verkoop_middag, 'verkoop_avond' => $verkoop_avond, 'vracht_ochtend' => $vracht_ochtend, 'vracht_middag' => $vracht_middag, 'vracht_avond' => $vracht_avond, 'service_ochtend' => $service_ochtend, 'service_middag' => $service_middag, 'service_avond' => $service_avond, 'werkzaamheden' => $werkzaamheden, 'error' => ''); 
      } 
      $stmt->close(); 
      $data = $row; 

有谁知道我在做什么错在这里？提前致谢！

完整的功能：

function get_current_planning($date) 
{ 
    GLOBAL $mysqli, $db_table_prefix; 
    $stmt = $mysqli->prepare("SELECT COUNT(datum) FROM " . $db_table_prefix . "planning WHERE datum = '" . $date . "'"); 
    $result = $stmt->execute(); 
print_r($result); 
var_dump($result); 

    if($result == 1) 
    { 
     $stmt->prepare("SELECT 
             * 
             FROM " . $db_table_prefix . "planning 
             WHERE datum = '" . $date . "'"); 
     $stmt->execute(); 
     $stmt->bind_result($id, $datum, $mac, $ipad, $iphone, $imember, $applecare, $verkoop_ochtend, $verkoop_middag, $verkoop_avond, $vracht_ochtend, $vracht_middag, $vracht_avond, $service_ochtend, $service_middag, $service_avond, $werkzaamheden); 
     while($stmt->fetch()) 
      { 
       $row[] = array('id' => $id, 'datum' => $datum, 'mac' => $mac, 'ipad' => $ipad, 'iphone' => $iphone, 'imember' => $imember, 'applecare' => $applecare, 'verkoop_ochtend' => $verkoop_ochtend, 'verkoop_middag' => $verkoop_middag, 'verkoop_avond' => $verkoop_avond, 'vracht_ochtend' => $vracht_ochtend, 'vracht_middag' => $vracht_middag, 'vracht_avond' => $vracht_avond, 'service_ochtend' => $service_ochtend, 'service_middag' => $service_middag, 'service_avond' => $service_avond, 'werkzaamheden' => $werkzaamheden, 'error' => ''); 
      } 
      $stmt->close(); 
      $data = $row; 
    } 
    else 
    { 
     $row[] = array('id' => '', 'datum' => '', 'mac' => '', 'ipad' => '', 'iphone' => '', 'imember' => '', 'applecare' => '', 'verkoop_ochtend' => '', 'verkoop_middag' => '', 'verkoop_avond' => '', 'vracht_ochtend' => '', 'vracht_middag' => '', 'vracht_avond' => '', 'service_ochtend' => '', 'service_middag' => '', 'service_avond' => '', 'werkzaamheden' => '', 'error' => 'Er is geen planning gevonden voor de huidige datum!'); 
     $stmt->close(); 
     $data = $row; 
    } 
    return $data; 
} 

print_r($result) returns 1

var_dump($result) returns bool(true)

Answer 1

您不是您的SELECT COUNT()...查询的结果。它在我看来像你的第二个查询中的while(...fetch())循环有时会运行零次。这将导致代码开始$row[] =无法运行，这反过来会导致$row在while(...fetch())循环之后未定义。

无论如何，用两个连续的查询来计算行数然后获取它们有点浪费。您可能希望完全跳过SELECT COUNT查询。相反，做这样的事情：

$row = Array(); 
while($stmt->fetch()) { 
    $row[] = array('id' => $id, 'datum' => $datum, 'mac' => $mac, 'ipad' => $ipad, 'iphone' => $iphone, 'imember' => $imember, 'applecare' => $applecare, 'verkoop_ochtend' => $verkoop_ochtend, 'verkoop_middag' => $verkoop_middag, 'verkoop_avond' => $verkoop_avond, 'vracht_ochtend' => $vracht_ochtend, 'vracht_middag' => $vracht_middag, 'vracht_avond' => $vracht_avond, 'service_ochtend' => $service_ochtend, 'service_middag' => $service_middag, 'service_avond' => $service_avond, 'werkzaamheden' => $werkzaamheden, 'error' => ''); 
} 
$stmt->close(); 
if (0 == count($row)) { 
    /* deal with the no matching rows case */ 
} 
$data = $row; 

Answer 2

看起来你还没有定义的变量$row。在开始将$row作为数组对待之前，您需要一个$row=Array();。