// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Richard Heyes
// +----------------------------------------------------------------------+
/**
* Pager class
*
* Handles paging a set of data. For usage see the example.php provided.
*
*/
class Pager {
/**
* Current page
* @var integer
*/
var $_currentPage;
/**
* Items per page
* @var integer
*/
var $_perPage;
/**
* Total number of pages
* @var integer
*/
var $_totalPages;
/**
* Item data. Numerically indexed array...
* @var array
*/
var $_itemData;
/**
* Total number of items in the data
* @var integer
*/
var $_totalItems;
/**
* Page data generated by this class
* @var array
*/
var $_pageData;
/**
* Constructor
*
* Sets up the object and calculates the total number of items.
*
* @param $params An associative array of parameters This can contain:
* currentPage Current Page number (optional)
* perPage Items per page (optional)
* itemData Data to page
*/
function pager($params = array())
{
global $HTTP_GET_VARS;
$this->_currentPage = max((int)@$HTTP_GET_VARS['pageID'], 1);
$this->_perPage = 8;
$this->_itemData = array();
foreach ($params as $name => $value) {
$this->{'_' . $name} = $value;
}
$this->_totalItems = count($this->_itemData);
}
/**
* Returns an array of current pages data
*
* @param $pageID Desired page ID (optional)
* @return array Page data
*/
function getPageData($pageID = null)
{
if (isset($pageID)) {
if (!empty($this->_pageData[$pageID])) {
return $this->_pageData[$pageID];
} else {
return FALSE;
}
}
if (!isset($this->_pageData)) {
$this->_generatePageData();
}
return $this->getPageData($this->_currentPage);
}
/**
* Returns pageID for given offset
*
* @param $index Offset to get pageID for
* @return int PageID for given offset
*/
function getPageIdByOffset($index)
{
if (!isset($this->_pageData)) {
$this->_generatePageData();
}
if (($index % $this->_perPage) > 0) {
$pageID = ceil((float)$index / (float)$this->_perPage);
} else {
$pageID = $index / $this->_perPage;
}
return $pageID;
}
/**
* Returns offsets for given pageID. Eg, if you
* pass it pageID one and your perPage limit is 10
* it will return you 1 and 10. PageID of 2 would
* give you 11 and 20.
*
* @params pageID PageID to get offsets for
* @return array First and last offsets
*/
function getOffsetByPageId($pageid = null)
{
$pageid = isset($pageid) ? $pageid : $this->_currentPage;
if (!isset($this->_pageData)) {
$this->_generatePageData();
}
if (isset($this->_pageData[$pageid])) {
return array(($this->_perPage * ($pageid - 1)) + 1, min($this->_totalItems, $this->_perPage * $pageid));
} else {
return array(0,0);
}
}
/**
* Returns back/next and page links
*
* @param $back_html HTML to put inside the back link
* @param $next_html HTML to put inside the next link
* @return array Back/pages/next links
*/
function getLinks($back_html = '>')
{
$url = $this->_getLinksUrl();
$back = $this->_getBackLink($url, $back_html);
$pages = $this->_getPageLinks($url);
$next = $this->_getNextLink($url, $next_html);
return array($back, $pages, $next, 'back' => $back, 'pages' => $pages, 'next' => $next);
}
/**
* Returns number of pages
*
* @return int Number of pages
*/
function numPages()
{
return $this->_totalPages;
}
/**
* Returns whether current page is first page
*
* @return bool First page or not
*/
function isFirstPage()
{
return ($this->_currentPage == 1);
}
/**
* Returns whether current page is last page
*
* @return bool Last page or not
*/
function isLastPage()
{
return ($this->_currentPage == $this->_totalPages);
}
/**
* Returns whether last page is complete
*
* @return bool Last age complete or not
*/
function isLastPageComplete()
{
return !($this->_totalItems % $this->_perPage);
}
/**
* Calculates all page data
*/
function _generatePageData()
{
$this->_totalItems = count($this->_itemData);
$this->_totalPages = ceil((float)$this->_totalItems / (float)$this->_perPage);
$i = 1;
if (!empty($this->_itemData)) {
foreach ($this->_itemData as $value) {
$this->_pageData[$i][] = $value;
if (count($this->_pageData[$i]) >= $this->_perPage) {
$i++;
}
}
} else {
$this->_pageData = array();
}
}
/**
* Returns the correct link for the back/pages/next links
*
* @return string Url
*/
function _getLinksUrl()
{
global $HTTP_SERVER_VARS;
// Sort out query string to prevent messy urls
$querystring = array();
if (!empty($HTTP_SERVER_VARS['QUERY_STRING'])) {
$qs = explode('&', $HTTP_SERVER_VARS['QUERY_STRING']);
for ($i = 0, $cnt = count($qs); $i
list($name, $value) = explode('=', $qs[$i]);
if ($name != 'pageID') {
$qs[$name] = $value;
}
unset($qs[$i]);
}
}
if(is_array($qs)){
foreach ($qs as $name => $value) {
$querystring[] = $name . '=' . $value;
}
}
return $HTTP_SERVER_VARS['SCRIPT_NAME'] . '?' . implode('&', $querystring) . (!empty($querystring) ? '&' : ') . 'pageID=';
}
/**
* Returns back link
*
* @param $url URL to use in the link
* @param $link HTML to use as the link
* @return string The link
*/
function _getBackLink($url, $link = '
{
// Back link
if ($this->_currentPage > 1) {
$back = '' . $link . '';
} else {
$back = ';
}
return $back;
}
/**
* Returns pages link
*
* @param $url URL to use in the link
* @return string Links
*/
function _getPageLinks($url)
{
// Create the range
$params['itemData'] = range(1, max(1, $this->_totalPages));
$pager =& new Pager($params);
$links = $pager->getPageData($pager->getPageIdByOffset($this->_currentPage));
for ($i=0; $i
$links[$i] = '' . $links[$i] . '';
}
}
return implode(' ', $links);
}
/**
* Returns next link
*
* @param $url URL to use in the link
* @param $link HTML to use as the link
* @return string The link
*/
function _getNextLink($url, $link = 'Next >>')
{
if ($this->_currentPage _totalPages) {
$next = '' . $link . '';
} else {
$next = ';
}
return $next;
}
}
?>

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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