


Simple paging class and usage examples implemented in PHP, php paging usage examples_PHP tutorial
Jul 12, 2016 am 08:53 AMPHP實(shí)現(xiàn)的簡(jiǎn)單分頁類及用法示例,php分頁用法示例
本文實(shí)例講述了PHP實(shí)現(xiàn)的簡(jiǎn)單分頁類及用法。分享給大家供大家參考,具體如下:
<?php /* * 使用: * $page = new Page(連接符,查詢語句,當(dāng)前頁碼,每頁大小,頁碼符) * 連接符:一個(gè)MYSQL連接標(biāo)識(shí)符,如果該參數(shù)留空,則使用最近一個(gè)連接 * 查詢語句:SQL語句 * 當(dāng)前頁碼:指定當(dāng)前是第幾頁 * 每頁大小:每頁顯示的記錄數(shù) * 頁碼符:指定當(dāng)前頁面URL格式 * * 使用例子: * $sql = "select * from aa"; * $page = new Page($conn,$sql,$_GET['page'],4,"?page="); * * 獲得當(dāng)前頁碼 * $page->page; * * 獲得總頁數(shù) * $page->pageCount; * * 獲得總記錄數(shù) * $page->rowCount; * * 獲得本頁記錄數(shù) * $page->listSize; * * 獲得記錄集 * $page->list; * 記錄集是一個(gè)2維數(shù)組,例:list[0]['id']訪問第一條記錄的id字段值. * * 獲得頁碼列表 * $page->getPageList(); */ class Page { //基礎(chǔ)數(shù)據(jù) var $sql; var $page; var $pageSize; var $pageStr; //統(tǒng)計(jì)數(shù)據(jù) var $pageCount; //頁數(shù) var $rowCount; //記錄數(shù) //結(jié)果數(shù)據(jù) var $list = array(); //結(jié)果行數(shù)組 var $listSize ; //構(gòu)造函數(shù) function Page($conn,$sql_in,$page_in,$pageSize_in,$pageStr_in) { $this->sql = $sql_in; $this->page = intval($page_in); $this->pageSize = $pageSize_in; $this->pageStr = $pageStr_in; //頁碼為空或小于1的處理 if(!$this->page||$this->page<1) { $this->page = 1; } //查詢總記錄數(shù) $rowCountSql = preg_replace("/([\w\W]*?select)([\w\W]*?)(from[\w\W]*?)/i","$1 count(0) $3",$this->sql); if(!$conn) $rs = mysql_query($rowCountSql) or die("bnc.page: error on getting rowCount."); else $rs = mysql_query($rowCountSql,$conn) or die("bnc.page: error on getting rowCount."); $rowCountRow = mysql_fetch_row($rs); $this->rowCount=$rowCountRow[0]; //計(jì)算總頁數(shù) if($this->rowCount%$this->pageSize==0) $this->pageCount = intval($this->rowCount/$this->pageSize); else $this->pageCount = intval($this->rowCount/$this->pageSize)+1; //SQL偏移量 $offset = ($this->page-1)*$this->pageSize; if(!$conn) $rs = mysql_query($this->sql." limit $offset,".$this->pageSize) or die("bnc.page: error on listing."); else $rs = mysql_query($this->sql." limit $offset,".$this->pageSize,$conn) or die("bnc.page: error on listing."); while($row=mysql_fetch_array($rs)) { $this->list[]=$row; } $this->listSize = count($this->list); } /* * getPageList方法生成一個(gè)較簡(jiǎn)單的頁碼列表 * 如果需要定制頁碼列表,可以修改這里的代碼,或者使用總頁數(shù)/總記錄數(shù)等信息進(jìn)行計(jì)算生成. */ function getPageList() { $firstPage; $previousPage; $pageList; $nextPage; $lastPage; $currentPage; //如果頁碼>1則顯示首頁連接 if($this->page>1) { $firstPage = "<a href=\"".$this->pageStr."1\">首頁</a>"; } //如果頁碼>1則顯示上一頁連接 if($this->page>1) { $previousPage = "<a href=\"".$this->pageStr.($this->page-1)."\">上一頁</a>"; } //如果沒到尾頁則顯示下一頁連接 if($this->page<$this->pageCount) { $nextPage = "<a href=\"".$this->pageStr.($this->page+1)."\">下一頁</a>"; } //如果沒到尾頁則顯示尾頁連接 if($this->page<$this->pageCount) { $lastPage = "<a href=\"".$this->pageStr.$this->pageCount."\">尾頁</a>"; } //所有頁碼列表 for($counter=1;$counter<=$this->pageCount;$counter++) { if($this->page == $counter) { $currentPage = "<b>".$counter."</b>"; } else { $currentPage = " "."<a href=\"".$this->pageStr.$counter."\">".$counter."</a>"." "; } $pageList .= $currentPage; } return $firstPage." ".$previousPage." ".$pageList." ".$nextPage." ".$lastPage." "; } } ?>
用法示例:
<?php @$db = mysql_connect('localhost', 'root', '123456') or die("Could not connect to database.");//連接數(shù)據(jù)庫(kù) mysql_query("set names 'utf8'");//輸出中文 mysql_select_db('test'); //選擇數(shù)據(jù)庫(kù) $sql = "select * from `users`"; //一個(gè)簡(jiǎn)單的查詢 $page = new Page('',$sql,$_GET['page'],5,"?page="); $rows = $page->list; foreach($rows as $row) { echo $row['UserName']."<br>"; } echo $page->getPageList(); //輸出分頁列表 ?>
更多關(guān)于PHP相關(guān)內(nèi)容感興趣的讀者可查看本站專題:《PHP數(shù)組(Array)操作技巧大全》、《PHP數(shù)學(xué)運(yùn)算技巧總結(jié)》、《php正則表達(dá)式用法總結(jié)》、《PHP+ajax技巧與應(yīng)用小結(jié)》、《PHP運(yùn)算與運(yùn)算符用法總結(jié)》、《PHP網(wǎng)絡(luò)編程技巧總結(jié)》、《PHP基本語法入門教程》、《php日期與時(shí)間用法總結(jié)》、《php面向?qū)ο蟪绦蛟O(shè)計(jì)入門教程》、《php字符串(string)用法總結(jié)》、《php+mysql數(shù)據(jù)庫(kù)操作入門教程》及《php常見數(shù)據(jù)庫(kù)操作技巧匯總》
希望本文所述對(duì)大家PHP程序設(shè)計(jì)有所幫助。

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.

To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X

1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.

User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.

PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.

PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.

PHP provides an input basis for AI models by collecting user data (such as browsing history, geographical location) and pre-processing; 2. Use curl or gRPC to connect with AI models to obtain click-through rate and conversion rate prediction results; 3. Dynamically adjust advertising display frequency, target population and other strategies based on predictions; 4. Test different advertising variants through A/B and record data, and combine statistical analysis to optimize the effect; 5. Use PHP to monitor traffic sources and user behaviors and integrate with third-party APIs such as GoogleAds to achieve automated delivery and continuous feedback optimization, ultimately improving CTR and CVR and reducing CPC, and fully implementing the closed loop of AI-driven advertising system.

PHPisstillrelevantinmodernenterpriseenvironments.1.ModernPHP(7.xand8.x)offersperformancegains,stricttyping,JITcompilation,andmodernsyntax,makingitsuitableforlarge-scaleapplications.2.PHPintegrateseffectivelyinhybridarchitectures,servingasanAPIgateway
