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我有执行查询,获取结果,然后对这些结果执行操作的代码。我想确保查询不会返回空,否则while条件将失败。检查数组是否为空,然后是条件
$ckey = $GLOBALS['ckey'];
$query3 = "SELECT * FROM uc_users WHERE id = $ckey;";
$result3 = mysqli_query($dbc, $query3);
if(!empty(mysqli_fetch_array($result3))
{
while($row3 = mysqli_fetch_array($result3))
{
$GLOBALS['cname'] = $row3['display_name'];
}
}
else{ echo "empty";}
这将返回 “致命错误:在写上下文C不能使用函数返回值:”
$ckey = $GLOBALS['ckey'];
$query3 = "SELECT * FROM uc_users WHERE id = $ckey;";
$result3 = mysqli_query($dbc, $query3);
if(mysqli_num_rows(mysqli_fetch_array($result3)))
{
while($row3 = mysqli_fetch_array($result3))
{
$GLOBALS['cname'] = $row3['display_name'];
}
}
else{ echo "empty";}
返回“警告:mysqli_num_rows()预计参数1被mysqli_result,数组给定在C:”
尝试'mysqli_num_rows($ result3)' –
临屋它真的非常感谢你! – user2967081