我正在从数据库中选择数据，我想将结果限制为X数量，然后显示剩余的行数，并在下面显示按钮以导航到结果的下一页（继续直到数据库中没有更多结果为止）。
我该怎么做。 我的代码只是获取它...但是如何添加页面1,2,3,4,5
类似于stackOverflow标签页
我的代码：
<?PHP
$SQL = "SELECT * FROM $tags_table LIMIT 20";
$Q = queryDB($SQL);
if (mysqli_num_rows($Q)) {
while ($row = mysqli_fetch_assoc($Q)) {
$tag_id= $row['tag_id'];
$details = $row['details'];
$tagName= $row['tag_name'];
$HTML_temp = "<div class='grid-view page-cell'>
<div class='page-header'><a href='#' class='post-page'>{$tagName}</a></div>
<div class='details'>{$details}</div>
</div>";
ECHO $HTML_temp;
}
}
?>
答案 0 :(得分：0)
我为此功能创建了答案。下面是我的代码，供将来使用。
PHP：
<?PHP
//count the number of rows in db
function countTags(){
global $conn, $tags_table;
$SQL = "SELECT COUNT(tag_id) FROM $tags_table";
return mysqli_fetch_array(queryDB($SQL))[0];
}
//Pager:
//Show next pages box if $options["NumOfRecords"] is greater than 20
//We fetching 20 records per page -- Adjust to your needs
function pager(array $options = array()){
$options = array_merge(array(
'NumOfRecords' => 0, //number of records from database
'maxPager' => 5, //number pager to show eg. 1-5
'maxPageRecords' => 20 // since I need 20 records maximum per/page
),$options);
$rows = (int) $options['NumOfRecords'];
$maxPager = (int) $options['maxPager'];
$maxPageRecords = (int) $options['maxPageRecords'];
//offset records
$offset = $rows - $maxPageRecords; //since our max records per page is 20
$totalPages = ceil($rows/$maxPageRecords); //move it to neart heigher number
$numOfPagesLeft = $totalPages-1; //pages left
if ($numOfPagesLeft) {
//check if tab_id is set
$tab_id = $activePage = isset($_GET['tab_id']) && (int)$_GET['tab_id'] ? (int)$_GET['tab_id']:1;
//store pager here
$pagerArray = array();
//url to page we working on
$URL = DOMAIN().'/'.(IsadminLogin() ? ("apps/tags/") :"tags/");
$i = 0; //pager counter
for ($row=0; $row < $numOfPagesLeft; $row++ ) {
$i++;
//show only five pager
if ($offset && $i <= $maxPager && $activePage !== $totalPages && $totalPages != $tab_id) {
$page_id = $tab_id++;
$href = $URL .$page_id;
$active = ($activePage == $page_id ? "current":"random");
$ellipse = ($i== $maxPager && $tab_id !== ($offset/$maxPageRecords) ? "<span class='page-numbers dots'>...</span>":"");
$pagerArray[] = "<a class='page-numbers {$active}' href='{$href}/'>{$page_id}</a>{$ellipse}";
}
}
//add previous page
if ($activePage > 1) {
//previous pagers
$prev = $activePage -1;
$prevHref = $URL .$prev;
$prevPagers = $activePage > 2 ? "<a class='page-numbers prv' href='{$URL}1'>1</a><span class='page-numbers dots'>...</span>":"";
array_unshift($pagerArray , "<a class='page-numbers prev' href='{$prevHref}/'>prev</a>{$prevPagers}");
}
//show next button if offset is true
if ($numOfPagesLeft) {
//next pagers
$next = $activePage +1;
$nextHref = $URL.$next;
$lastPager = $totalPages;
$PagerLast = $URL.$lastPager;
$active = ($activePage == $lastPager ? "current":"random");
$pagerS = $lastPager ? "<a href='{$PagerLast}' class='page-numbers {$active}'>{$lastPager}</a>":"";
array_push($pagerArray , $totalPages != $tab_id ? "{$pagerS} <a class='page-numbers prev' href='{$nextHref}/'>next</a>":"{$pagerS}");
}
//implode pager
return join('',$pagerArray);
}
}
$maxPageRecords = 20; //since we fetching 20 records/page
$tab_id = isset($_GET['tab_id']) && (int)$_GET['tab_id'] > 0 ? (int)$_GET['tab_id']:1;
$offset = $tab_id == 1 ? 0:($tab_id > 1 ? ($tab_id-1) *$maxPageRecords:0);//calculate offset for SQL
$SQL = "SELECT * FROM $tags_table LIMIT {$maxPageRecords} OFFSET {$offset}";
$Q = queryDB($SQL);
$NR = mysqli_num_rows($Q);// number of rows returned
if ($NR) {
while ($row = mysqli_fetch_assoc($Q)) {
$tag_id = $row['tag_id'];
$details = $row['details'];
$TagName = $row['tag_name'];
$HTML_temp = "<div class='grid-view tag-cell'>
<div class='excerpt-header'><a href='#' class='post-tag'>{$TagName}</a></div>
<div class='excerpt'>{$details}</div>
</div>";
ECHO $HTML_temp;
}
}else{
ECHO "No tags found in database";
}
//echo $offset;
//GET current domain name
$LOCALIP = array('127.0.0.1','::1');
$sitename = "school";
$HostStatus = !in_array(GET_IP(), $LOCALIP)? TRUE:FALSE; //hosting local or remote server
function DOMAIN(){global $HostStatus,$sitename;if (isset($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] == 1) ||isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &&$_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') { $domain = 'https://'.str_replace(array('https://www.','http://www.','www.'), '', ($_SERVER['SERVER_NAME'])).($HostStatus ? '':'/'.$sitename);}else {$domain = 'http://'.str_replace(array('https://www.','http://www.','www.'), '', ($_SERVER['SERVER_NAME'])).($HostStatus ? '':'/'.$sitename);} return $domain;}function GET_IP(){if (!empty($_SERVER['HTTP_CLIENT_IP'])) {$ip=$_SERVER['HTTP_CLIENT_IP'];}elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];}else{$ip=$_SERVER['REMOTE_ADDR'];}return $ip;}
?>
HTML： 让我们调用 pager（）函数
<div class='pager'>
<div class='col-lg-12 no-padding'>
<div class='col-lg-2'></div>
<div class='col-lg-4'></div>
<div class='col-lg-6 no-padding'>
<div class="pager rfloat">
<?PHP
//call pager() on the button of the page u want to show pagwer boxes
ECHO pager(array(
'maxPageRecords'=>20,
'NumOfRecords'=>countTags(), //records could be any number e.g. 400,200,52,12..make sure its coming from DB
'maxPager'=>5));
?>
</div>
</div>
</div>
</div>
CSS：
.pager a{
display: inline-block;
padding: 4px 8px;
font-size: 12px;
color: #848d95;
border: 1px solid #e4e6e8;
border-radius: 3px;
background-color: transparent;
margin-left: 5px;
}
.page-numbers.current,.page-numbers:hover{
transition: all ease-in-out .2s;
color: #FFF;
background-color: #ff7308;
border-color: transparent;
}
.page-numbers.dots{
color: #848d95;
background-color: transparent;
border-color: transparent;
box-shadow: none;
padding:0 15px;
letter-spacing: 3px;
}