学习要点:
1.LIMIT 用法
2.各种参数
3.超链接调用
第一:先在文件中设置数字分页模块;我的文件是(blog.php)
$_page = $_GET['page'];
$_pagesize = 10;
$_pagenum = ($_page - 1) * $_pagesize;
//首页要得到所有的数据总和
$_num=mysql_num_rows(_query("SELECT tg_id FROM tg_user"));
$_pageabsolute=$_num / $_pagesize;
要注意的是在数据库中取集的时候
$_result = _query("SELECT tg_username,tg_sex,tg_face FROM tg_user ORDER BY tg_reg_time DESC LIMIT $_pagenum,$_pagesize");
设置分页循环的效果
<div id="page_num"> <ul> <?php for($i=0;$i<$_pageabsolute;$i++){ if ($_page == ($i+1)) { echo '<li><a href="blog.php?page='.($i+1).'" class="selected">'.($i+1).'</a></li>'; }else{ echo '<li><a href="blog.php?page='.($i+1).'">'.($i+1).'</li>'; } } ?> </ul> </div>
相对应的CSS
#page_num { height:20px; clear:both; padding:10px 0; position:relative; } #page_num ul { position:absolute; right:30px; height:20px; } #page_num ul li { float:left; width:26px; height:20px; } #page_num ul li a { display:block; width:20px; height:20px; line-height:20px; border:1px solid #333; text-align:center; text-decoration:none; } #page_num ul li a:hover,#page_num ul li a.selected { background:#666; font-weight:bold; color:#fff; }
在其中可能会由于编码出现容错误,解决的方法是
// 分页模块 if (isset ( $_GET ['page'] )) { // 在数据不再数据范围内出错的解决方法 $_page = $_GET['page']; // 是否为空,是否小于0,是否不是数字。//如果其中有一个是,那么就=1 if (empty ( $_page )||$_page < 0 || !is_numeric( $_page )) { $_page = 1; } else { $_page = intval ( $_page ); // 如果是数字,但是小数,那么就$_page = intval($_page);转换成整数 } } else { $_page = 1; } $_pagesize = 10; $_num = _num_rows( _query ( "SELECT tg_id FROM tg_user" ) ); if ($_num==0) { $_pageabsolute=1; }else{ $_pageabsolute=ceil($_num/$_pagesize); } //当页码大于总页码的时候,就会返回到总页码的最后一页 if ($_page>$_pageabsolute) { $_page=$_pageabsolute; } $_pagenum = ($_page - 1) * $_pagesize;

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi


Hot AI Tools

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

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

Undress AI Tool
Undress images for free

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

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

Dreamweaver CS6
Visual web development tools

WebStorm Mac version
Useful JavaScript development tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
