好的,所以我尝试创建一个自定义函数,该函数将为最终用户在iframe中回显网站网址.
该脚本必须检查用户是否已经查看过该站点,如果已经看到该站点,则不再显示该站点,而是从数据库中获取另一个站点url等.
到目前为止,这是我想出的:
function get_urls() {
require 'config.PHP';
global $con;
global $currentUsername;
$con = MysqLi_connect($hostname, $dbusername, $dbpassword, $dbname);
$query = "SELECT site_url FROM sites WHERE site_url IS NOT NULL";
$result = MysqLi_query($con, $query);
// Get all the site urls into one array
$siteUrls = array();
$index = 0;
while($row = MysqLi_fetch_assoc($result)) {
$siteUrls[$index] = $row;
$index++;
}
$query2 = "SELECT site_url FROM views WHERE user = '$currentUsername' AND site_url IS NOT NULL";
$result2 = MysqLi_query($con, $query2);
// Get urls the user has already seen into another array
$seenUrls = array();
$index = 0;
while($row2 = MysqLi_fetch_assoc($result2)) {
$seenUrls[$index] = $row2;
$index++;
}
// Compare the two arrays and create yet another array of urls to actually show
$urlsToShow = array_diff($siteUrls, $seenUrls);
if (!empty($urlsToShow)) {
// Echo the url to show for the iframe within browse.PHP and add an entry to the database that the user has seen this site
foreach ($urlsToShow as $urlToShow) {
echo $urlToShow;
$query = "INSERT INTO views VALUES ('', '$currentUsername', '$urlToShow')";
MysqLi_query($con, $query);
break;
}
}
// Show the allSeen file when all the ads are seen
else {echo 'includes/allSeen.PHP';}
MysqLi_free_result($result);
MysqLi_close($con);
}
我目前发现了两个错误.首先$siteUrls和$seenUrls都可以,但是当我使用array_diff比较两者时,它将返回一个空数组.
其次,脚本不会将站点URL写入数据库,因为$urlToShow是一个数组而不是单个URL?
解决方法:
我认为问题出在您的代码中,您正在创建$siteUrls,$seenUrls数组. MysqLi_fetch_assoc()函数将为您提供结果行作为关联数组.因此,如果您想在while循环中更改某些代码.
请修改
while($row = MysqLi_fetch_assoc($result)) {
$siteUrls[$index] = $row;
$index++;
}
至
while($row = MysqLi_fetch_assoc($result)) {
$siteUrls[$index] = $row['site_url'];
$index++;
}
并且在第二个while循环中.改变这个
while($row2 = MysqLi_fetch_assoc($result2)) {
$seenUrls[$index] = $row2;
$index++;
}
至
while($row2 = MysqLi_fetch_assoc($result2)) {
$seenUrls[$index] = $row2['site_url'];
$index++;
}
并尝试