创建一个简单的分页
你需要在页面中包含 Pagination.php。
require_once 'Paginator.php';
$Paginator = new Paginator('mysql:host=localhost;dbname=ng_app', 'root', '000000');
$Paginator->setItemLimitPerPage(4);
$Paginator->setTable('comments');
$Paginator->createPages(); // this will create pages using PHP copy()
$Paginator->setCurrentPageClass('active'); // set the current page class
$Paginator->setUrlPattern('/php_paginator/');
$numPrevPage = 4; // number of pages to appear before the current page
$numNextPage = 4; // number of pages to appear after the current page
$paginationCssClass = 'pagination';
创造分页
<div class="text-center">
<!-- our pagination using Bootstrap-->
<hr>
<?php
$Paginator->pagination($Paginator->getPageNumber(), $numPrevPage, $numNextPage, $paginationCssClass);
?>
</div
创建 Paginator 文件
<?php
class Paginator
{
private $_db;
private $_table = null;
private $_currentPageClass = '';
private $_itemLimitPerPage;
private $_rowOffset = 0;
private $_urlPattern = '/';
/**
* @return string url pattern
*/
public function getUrlPattern()
{
return $this->_urlPattern;
}
/**
* @param string $urlPattern
*/
public function setUrlPattern($urlPattern)
{
$this->_urlPattern = $urlPattern;
}
/**
* @return int value of itemLimitPerPage
*/
public function getItemLimitPerPage()
{
return $this->_itemLimitPerPage;
}
/**
* @param int $limitItems number of items per page
*/
public function setItemLimitPerPage($limitItems)
{
$this->_itemLimitPerPage = $limitItems;
}
/**
* @return int value of rowOffset
*/
public function getRowOffset()
{
return $this->_rowOffset;
}
/**
* @param int $rowOffset number of row offset
*/
public function setRowOffset($rowOffset)
{
$this->_rowOffset = $rowOffset;
}
/**
* Paginator constructor.
* @param string $dsn database host and database name
* @param string $username database username
* @param string $password user password
*/
public function __construct($dsn, $username, $password)
{
try {
$this->_db = new PDO($dsn, $username, $password);
} catch (PDOException $e) {
echo $e->getMessage();
}
}
/**
* Get the name of the table
* @return string the name of the table
*/
public function getTable()
{
return $this->_table;
}
/**
* Set the name of the table
* @param string $table the name of the table to be used
*/
public function setTable($table)
{
$this->_table = $table;
}
/**
* Get the class to be used on the current item/page
* @return string the current page class
*/
public function getCurrentPageClass()
{
return $this->_currentPageClass;
}
/**
* Set the class to be used on the current item/page
* @param string $currentPageClass set the class to be used for the current page
*/
public function setCurrentPageClass($currentPageClass)
{
$this->_currentPageClass = $currentPageClass;
}
/**
* Get the number of rows available
* @param null $table optional table name
* @return int the number of row count
* @throws Exception when table is not set or provided
*/
public function getRowCount($table = null)
{
if ($this->_table === null && $table === null) {
throw new Exception("Table was not set");
} else {
if ($table !== null) {
$stmt = $this->_db->prepare("SELECT * FROM $table");
$stmt->execute();
return $stmt->rowCount();
} elseif ($this->_table !== null) {
$stmt = $this->_db->prepare("SELECT * FROM $this->_table");
$stmt->execute();
return $stmt->rowCount();
}
}
}
/**
* Get the number of rows left from the database
* @param null $table optional table name
* @return int number of rows left
* @throws Exception when table is not set or provided
*/
public function getRowsLeft($table = null)
{
if ($this->getCurrentPage() !== 'index.php') {
$this->_rowOffset = ($this->_itemLimitPerPage * $this->getPageNumber());
}
if ($this->_table === null && $table === null) {
throw new Exception("Table was not set");
} else {
if ($table !== null) {
$stmt = $this->_db->prepare("SELECT * FROM $table LIMIT " . $this->getRowOffset() . "," . $this->getItemLimitPerPage());
$stmt->execute();
return $stmt->rowCount();
} elseif ($this->_table !== null) {
$stmt = $this->_db->prepare("SELECT * FROM $this->_table LIMIT " . $this->getRowOffset() . "," . $this->getItemLimitPerPage());
$stmt->execute();
return $stmt->rowCount();
}
}
}
/**
* Get data to be used on the current page
* @param int $colId column id
* @param array $params optional parameters for ['table' => 'tableName', 'sort' => 'ASC', 'columns' => 'colId, name, etc']
* @return array columns from database
* @throws Exception when table is not set or provided
*/
public function getPageData($colId, $params = [])
{
if ($this->_table === null && !isset($params['table'])) {
throw new Exception("Table was not set");
}
$columns = isset($params['columns']) ? $params['columns'] : '*';
$sort = isset($params['sort']) ? $params['sort'] : 'DESC';
if (isset($params['table'])) {
$table = $params['table'];
$rowsLeft = $this->getRowsLeft($table);
if ($rowsLeft < $this->_itemLimitPerPage) {
$this->_itemLimitPerPage = $rowsLeft;
}
$select = "SELECT $columns FROM " . $table . " ORDER BY $colId $sort LIMIT ?,?";
$prepare = $this->_db->prepare($select);
$prepare->bindParam(1, $this->_rowOffset, PDO::PARAM_INT);
$prepare->bindParam(2, $this->_itemLimitPerPage, PDO::PARAM_INT);
$prepare->execute();
$results = $prepare->fetchAll();
return $results;
} elseif ($this->_table !== null) {
$rowsLeft = $this->getRowsLeft($this->_table);
if ($rowsLeft < $this->_itemLimitPerPage) {
$this->_itemLimitPerPage = $rowsLeft;
}
$prepare = $this->_db->prepare("SELECT * FROM $this->_table ORDER BY $colId $sort LIMIT " . $this->getRowOffset() . "," . $this->getItemLimitPerPage());
$prepare->execute();
$results = $prepare->fetchAll();
return $results;
}
}
/**
* Create pages that will appear before the current page
* @param int $pageNumber the current page number
* @param int $numPrevPages the number of pages to appear before the current page
* @param $cssClass class set to the li list
* @param $attr attribtes for li list
* @return string list of pagination links
*/
function prevPages($pageNumber, $numPrevPages, $cssClass, $attr)
{
$listItems = ''; // to save all list items.
while ($numPrevPages >= 1) {
$pageNumber -= 1;
if ($pageNumber >= 1) {
$page = $pageNumber . '.php';
if (file_exists("$page")) {
$listItems = '<li class="' . $cssClass . '" ' . $attr . '><a href="' . $this->getUrlPattern() . $pageNumber . '.php">' . $pageNumber . '</a></li>' . $listItems;
}
}
$numPrevPages -= 1;
}
return $listItems;
}
/**
* Create pages that will appear after the current page
* @param $pageNumber the current page number
* @param $numNextPages the number of pages to appear after the current page
* @param $cssClass class set to the li list
* @param $attr attribtes for li list
* @return string list of pagination links
*/
function nextPages($pageNumber, $numNextPages, $cssClass, $attr)
{
$listItems = ''; // to save list items.
$count = 1;
while ($count <= $numNextPages) {
$pageNumber += 1;
$page = $pageNumber . '.php';
if (file_exists("$page")) {
$listItems .= '<li class="' . $cssClass . '" ' . $attr . '><a href="' . $this->getUrlPattern() . $pageNumber . '.php">' . $pageNumber . '</a></li>';
}
$count += 1;
}
return $listItems;
}
/**
* Create the pagination links
* @param $pageNumber the current page number
* @param $numPrevPages the number of pages to appear before the current page
* @param $numNextPages the number of pages to appear after the current page
* @param array $attributes optional list of list attributes.
* ['ul-class': => 'space separated list of classes', 'ul-attr': 'id="someId" data-pre="pre"', 'li-class': 'space separated list of classes', 'li-attr': 'id="someid"']
*/
function pagination($pageNumber, $numPrevPages, $numNextPages, $attributes = [])
{
$ulCssClass = isset($attributes['ul-class']) ? $attributes['ul-class'] : '';
$ulAttr = isset($attributes['ul-attr']) ? $attributes['ul-attr'] : '';
$liCssClass = isset($attributes['li-class']) ? $attributes['li-class'] : '';
$liAttr = isset($attributes['li-attr']) ? $attributes['li-attr'] : '';
$prevPagesList = '<ul class="' . $ulCssClass . '" ' . $ulAttr . '>' . $this->prevButton($pageNumber) . $this->prevPages($pageNumber, $numPrevPages, $liCssClass, $liAttr);
$nextPageList = $this->nextPages($pageNumber, $numNextPages, $liCssClass, $liAttr) . $this->nextButton($pageNumber) . '</ul>';
if ($pageNumber == 'index') {
$listItems = $prevPagesList . $nextPageList;
} else {
$listItems = $prevPagesList . '<li class="' . $this->getCurrentPageClass() . '"><a href="">' . $pageNumber . '</a> </li>' . $nextPageList;
}
echo $listItems;
}
/**
* Create a link for previous button
* @param $pageNumber the current page number
* @return string the previous link item list
*/
function prevButton($pageNumber)
{
$prev = '';
if ($pageNumber == 1) {
$prev = '<li><a href="index.php">« Previous</a></li>';
} elseif ($pageNumber > 1) {
$prev = '<li><a href="' . $this->getUrlPattern() . ($pageNumber - 1) . '.php' . '">« Previous</a></li>';
}
return $prev;
}
/**
* Create a link for next button
* @param $pageNumber the current page number
* @return string the next link item list
*/
function nextButton($pageNumber)
{
if ($pageNumber == 'index') {
$page = '1.php';
} else {
$page = ($pageNumber + 1) . '.php';
}
if (file_exists($page)) {
return '<li><a href="' . $this->getUrlPattern() . ($pageNumber + 1) . '.php">Next » </a></li>';
}
return '';
}
/**
* Get the current page number
* @return int the current page number
*/
function getPageNumber()
{
$currentPage = basename($_SERVER['SCRIPT_FILENAME']);
$pageNumber = rtrim($currentPage, '.php');
return $pageNumber;
}
/**
* Get the current page
* @return string return the current page
*/
function getCurrentPage()
{
$currentPage = basename($_SERVER['SCRIPT_FILENAME']);
return $currentPage;
}
/**
* create the required pages
*/
function createPages()
{
$last_page = ($this->getRowCount() / $this->getItemLimitPerPage()) - 1;
if (!is_int($last_page)) {
$last_page = (int)$last_page + 1;
}
for ($counter = 1; $counter <= $last_page; $counter++) {
$page = $counter . '.php';
if (!file_exists($page)) {
copy('index.php', $page);
}
}
}
}