php - 从 MySQL 切换到 MYSQLi - 循环不起作用

Question

我正在将我的网站从使用 mysql 更改为 mysqli。到目前为止，更改非常简单，但我有一个带有 for 循环的日历页面，切换后该页面不起作用。我很确定是循环导致了错误，但我似乎找不到修复方法。

这是代码的选择，它适用于 mysql_query(我已注释掉)，但不适用于 mysqli->query

<?php include("conn.php");

$today = mktime(12,0,0,date("m"),1,date("Y"));
$currentmonth = date(m, $today);
$currentyear = date(Y, $today);
$prevmonth = $currentmonth - 1;
$prevyear = $currentyear;
$prevdate = mktime(12, 0, 0, $prevmonth, 1, $prevyear);
$pdim = date("t", $prevdate);

function showMonth($month, $year, $pdims, $prevmonths, $prevyears)
{
$caldate = mktime(12, 0, 0, $month, 1, $year);
$offset = date("w", $caldate);
$pdimsplus = $pdims + 1;
$enddays = $pdimsplus - $offset;

for($i = 1; $i <= $offset; $i++)
{   
$qryhead1 = "SELECT * FROM photos WHERE day(date) = $enddays AND month(date) = $prevmonths AND year(date) = $prevyears LIMIT 1";

//$res1 = $mysqli->query($qryhead1);
//$noofrec1 = $res1->num_rows;
//if ($noofrec1 > 0) {    
//while ($row1 = mysqli_fetch_object($res1)) {

$res1 = mysql_query($qryhead1);
$noofrec1 = mysql_num_rows($res1); 
if ($noofrec1 > 0) {
while ($row1 = mysql_fetch_object ($res1)) {
    $id = $row1->id;
    $image = $row1->image; ?>
    <div><?php print("$enddays"); ?><a href="<?php print("$id"); ?>"><img src="/images/<?php print("$image"); ?>"></a></div>
    <?php } 
    } else { ?>
    <div><?php print("$enddays"); ?></div>
    <?php }
    $enddays++;
    }
}
?>

<div>
<?php showMonth($currentmonth, $currentyear, $pdim, $prevmonth, $prevyear); ?>
</div>

Answer 1

如果您有 $mysqli对象(我假设您在 conn.php 中创建了一个)，您没有将其作为自定义函数 showMonth() 的函数参数传递。 。阅读 variable scope .