Question

--------------------------错误代码------------------- ----------

第65行致命错误：未被捕获的错误：在C：\ xampp \ htdocs \ aa \ index.php：65中的null上调用成员函数prepare（）堆栈跟踪：＃0 C：\ xampp \ htdocs \ aa \ index.php（102）：heart（2，':: 1'）＃1 {main}在第65行的C：\ xampp \ htdocs \ aa \ index.php中抛出

--------------------------数据库连接------------------- ----------

<?php
// DB credentials.
define('DB_HOST','localhost');
define('DB_USER','root');
define('DB_PASS','');
define('DB_NAME','heart');
// Establish database connection.
try
{
$con= new PDO("mysql:host=".DB_HOST.";dbname=".DB_NAME,DB_USER, 
DB_PASS,array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'"));
}
catch (PDOException $e)
{
exit("Error: " . $e->getMessage());
}


?>

------------------------------- index.php代码------------ -------------------

<?php
function heart($mediaId, $userId) { // Function called "heart". We pass 2 
arguments, the media Id and our user Id
require_once ('connexion.php'); // Connection to database
$heart = '<div id="lineBlock">'; // See the CSS, we align the 2 div: heart 
div and value

$select = $con->prepare('SELECT value FROM heart_votes WHERE media = ? AND 
user_id = ?'); // We check the current heart value (0 or 1) for our user Id
$select->execute(array($mediaId, $userId)); 
$getVal = $select->fetch();



if (isset($getVal['value'])) { // If the value exists (if we have a record in the database table)
    if ($getVal['value'] == true) $heart .= '<div id="heart'.$mediaId.'" class="oneLine heart_icon on" rel="'.$userId.'"></div>';
    if ($getVal['value'] == false) $heart .= '<div id="heart'.$mediaId.'" class="oneLine heart_icon off" rel="'.$userId.'"></div>';
} else { // Else we create the ligne in the database
    $insert = $con->prepare('INSERT INTO heart_votes (media, user_id, value) VALUES(:media, :user_id, :value)');
    $success = $insert->execute(array(
                'media' => $mediaId,
                'user_id' => $userId,
                'value' => false
                ));
    $heart .= '<div id="heart'.$mediaId.'" class="oneLine heart_icon off" rel="'.$userId.'"></div>';
}

// Next to the heart we display the number of vote
$numVote = $con->prepare('SELECT value FROM heart_votes WHERE media = '.$mediaId.' AND value = 1');
$numVote->execute();
$numVote->setFetchMode(PDO::FETCH_OBJ);

$heart .= '<div class="oneLine num_vote" id="heart_num_vote'.$mediaId.'">'.$numVote->rowCount().'</div>';
$heart .= '</div>';

return $heart;
}

$userIP = $_SERVER['REMOTE_ADDR']; // Get User IP address
$userId = str_replace('.', '', $userIP); // Remove the . "dot" from the IP 
address to have a unique integer

echo '<p>';
echo heart(1, $userId); // Media Id, user Id
echo '</p>';
echo '<p>';
echo heart(2, $userId);
echo '</p>';
?>`

`

未定义的PHP变量，但databese变量很好

0 个答案: