【php100译稿】PDF全称Portable Document Format,译为可移植文档格式,是Adobe公司推出的便携文档格式。PDF具有与操作系统无关的特性,这一性能使它成为在Internet上进行电子文档发行和数字化信息传播的理想文档格式。今天我们来讨论如何使用PHP创建PDF文档,以及使用PHP修改PDF。
要想在PHP中使用PDF文档,我们需要用到TCPDF包,一个PHP用来读取PDF的类。
PHP创建PDF文档
你可以从下面给出的链接下载TCPDF包。
TCPDF - PHP class for PDF:http://sourceforge.net/projects/tcpdf/files/
这是一个免费且易用的插件包,下面我们给出一些示例来演示如何使用TCPDF包。
示例一:使用PHP生成一个简单的PDF文档
<ol class="dp-c"><li class="alt"><span><span><?php </SPAN></span><li><span> </span></li> <li class="alt"> <span class="keyword">require_once</span><span>(</span><span class="string">'../config/lang/eng.php'</span><span>); </span> </li> <li> <span class="keyword">require_once</span><span>(</span><span class="string">'../tcpdf.php'</span><span>); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// create new PDF document </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span> = </span><span class="keyword">new</span><span> TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, </span><span class="string">'UTF-8'</span><span>, false); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// set document information </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->SetCreator(PDF_CREATOR); </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetAuthor(</span><span class="string">'Nicola Asuni'</span><span>); </span> </li> <li> <span class="vars">$pdf</span><span>->SetTitle(</span><span class="string">'TCPDF Example 002'</span><span>); </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetSubject(</span><span class="string">'TCPDF Tutorial'</span><span>); </span> </li> <li> <span class="vars">$pdf</span><span>->SetKeywords(</span><span class="string">'TCPDF, PDF, example, test, guide'</span><span>); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// remove default header/footer </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->setPrintHeader(false); </span> </li> <li> <span class="vars">$pdf</span><span>->setPrintFooter(false); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// set default monospaced font </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">//set margins </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">//set auto page breaks </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">//set image scale factor </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->setImageScale(PDF_IMAGE_SCALE_RATIO); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">//set some language-dependent strings </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->setLanguageArray(</span><span class="vars">$l</span><span>); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// --------------------------------------------------------- </span><span> </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// set font </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->SetFont(</span><span class="string">'times'</span><span>, </span><span class="string">'BI'</span><span>, 20); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// add a page </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->AddPage(); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// print a line using Cell() </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->Cell(0, 10, </span><span class="string">'Example 002'</span><span>, 1, 1, </span><span class="string">'C'</span><span>); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// --------------------------------------------------------- </span><span> </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">//Close and output PDF document </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->Output(</span><span class="string">'example_002.pdf'</span><span>, </span><span class="string">'I'</span><span>); </span> </li> <li><span>?> </span></li></span></li></ol>
使用PHP修改PDF文档
下面我们讨论如何使用PHP修改PDF文档。假设我们需要将一张图片通过PHP程序加入到PDF中,示例代码如下:
示例二:使用PHP在PDF中增加一张图片
<ol class="dp-c"><li class="alt"><span><span><?php </SPAN></span><li> <span class="keyword">require_once</span><span>(</span><span class="string">'../config/lang/eng.php'</span><span>); </span> </li> <li class="alt"> <span class="keyword">require_once</span><span>(</span><span class="string">'../tcpdf.php'</span><span>); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// create new PDF document </span><span> </span> </li> <li> <span class="vars">$pdf</span><span> = </span><span class="keyword">new</span><span> TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, </span><span class="string">'UTF-8'</span><span>, false); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// set document information </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetCreator(PDF_CREATOR); </span> </li> <li> <span class="vars">$pdf</span><span>->SetAuthor(</span><span class="string">'Nicola Asuni'</span><span>); </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetTitle(</span><span class="string">'TCPDF Example 009'</span><span>); </span> </li> <li> <span class="vars">$pdf</span><span>->SetSubject(</span><span class="string">'TCPDF Tutorial'</span><span>); </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetKeywords(</span><span class="string">'TCPDF, PDF, example, test, guide'</span><span>); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// set default header data </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->SetHeaderData(PDF_HEADER_LOGO, PDF_HEADER_LOGO_WIDTH, PDF_HEADER_TITLE, PDF_HEADER_STRING); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// set header and footer fonts </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->setHeaderFont(Array(PDF_FONT_NAME_MAIN, </span><span class="string">''</span><span>, PDF_FONT_SIZE_MAIN)); </span> </li> <li> <span class="vars">$pdf</span><span>->setFooterFont(Array(PDF_FONT_NAME_DATA, </span><span class="string">''</span><span>, PDF_FONT_SIZE_DATA)); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// set default monospaced font </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">//set margins </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT); </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetHeaderMargin(PDF_MARGIN_HEADER); </span> </li> <li> <span class="vars">$pdf</span><span>->SetFooterMargin(PDF_MARGIN_FOOTER); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">//set auto page breaks </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">//set image scale factor </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->setImageScale(PDF_IMAGE_SCALE_RATIO); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">//set some language-dependent strings </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->setLanguageArray(</span><span class="vars">$l</span><span>); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// --------------------------------------------------------- </span><span> </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// add a page </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->AddPage(); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// set JPEG quality </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->setJPEGQuality(75); </span> </li> <li><span> </span></li> <li class="alt"> <span class="comment">// Image example </span><span> </span> </li> <li> <span class="vars">$pdf</span><span>->Image(</span><span class="string">'../images/image_demo.jpg'</span><span>, 50, 50, 100, 150, </span><span class="string">''</span><span>, </span><span class="string">'http://www.tcpdf.org'</span><span>, </span><span class="string">''</span><span>, true, 150); </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">// --------------------------------------------------------- </span><span> </span> </li> <li class="alt"><span> </span></li> <li> <span class="comment">//Close and output PDF document </span><span> </span> </li> <li class="alt"> <span class="vars">$pdf</span><span>->Output(</span><span class="string">'example_009.pdf'</span><span>, </span><span class="string">'I'</span><span>); </span> </li> <li><span>?> </span></li></span></li></ol>
http://www.tecnick.com/public/code/cp_dpage.php?aiocp_dp=tcpdf_examples
同时,你也可以使用TCPDF的基础属性进行PDF文档的管理。如果你想自己开发一个PHP的PDF文档类,可以参考PHP文档中关于PDF的一些函数介绍:http://www.php.net/manual/en/ref.pdf.php

tomodifyDataNaphPsession,startTheSessionWithSession_start(),然后使用$ _sessionToset,修改,orremovevariables.1)startThesession.2)setthesession.2)使用$ _session.3)setormodifysessessvariables.3)emovervariableswithunset()

在PHP会话中可以存储数组。1.启动会话,使用session_start()。2.创建数组并存储在$_SESSION中。3.通过$_SESSION检索数组。4.优化会话数据以提升性能。

PHP会话垃圾回收通过概率机制触发,清理过期会话数据。1)配置文件中设置触发概率和会话生命周期;2)可使用cron任务优化高负载应用;3)需平衡垃圾回收频率与性能,避免数据丢失。

PHP中追踪用户会话活动通过会话管理实现。1)使用session_start()启动会话。2)通过$_SESSION数组存储和访问数据。3)调用session_destroy()结束会话。会话追踪用于用户行为分析、安全监控和性能优化。

利用数据库存储PHP会话数据可以提高性能和可扩展性。1)配置MySQL存储会话数据:在php.ini或PHP代码中设置会话处理器。2)实现自定义会话处理器:定义open、close、read、write等函数与数据库交互。3)优化和最佳实践:使用索引、缓存、数据压缩和分布式存储来提升性能。

phpsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIdStoredInacookie.here'showtomanageThemeffectionaly:1)startAsessionWithSessionwwithSession_start()和stordoredAtain $ _session.2)

在PHP中,遍历会话数据可以通过以下步骤实现:1.使用session_start()启动会话。2.通过foreach循环遍历$_SESSION数组中的所有键值对。3.处理复杂数据结构时,使用is_array()或is_object()函数,并用print_r()输出详细信息。4.优化遍历时,可采用分页处理,避免一次性处理大量数据。这将帮助你在实际项目中更有效地管理和使用PHP会话数据。

会话通过服务器端的状态管理机制实现用户认证。1)会话创建并生成唯一ID,2)ID通过cookies传递,3)服务器存储并通过ID访问会话数据,4)实现用户认证和状态管理,提升应用安全性和用户体验。


热AI工具

Undresser.AI Undress
人工智能驱动的应用程序,用于创建逼真的裸体照片

AI Clothes Remover
用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool
免费脱衣服图片

Clothoff.io
AI脱衣机

Video Face Swap
使用我们完全免费的人工智能换脸工具轻松在任何视频中换脸!

热门文章

热工具

Atom编辑器mac版下载
最流行的的开源编辑器

SecLists
SecLists是最终安全测试人员的伙伴。它是一个包含各种类型列表的集合,这些列表在安全评估过程中经常使用,都在一个地方。SecLists通过方便地提供安全测试人员可能需要的所有列表,帮助提高安全测试的效率和生产力。列表类型包括用户名、密码、URL、模糊测试有效载荷、敏感数据模式、Web shell等等。测试人员只需将此存储库拉到新的测试机上,他就可以访问到所需的每种类型的列表。

Dreamweaver CS6
视觉化网页开发工具

SublimeText3汉化版
中文版,非常好用

DVWA
Damn Vulnerable Web App (DVWA) 是一个PHP/MySQL的Web应用程序,非常容易受到攻击。它的主要目标是成为安全专业人员在合法环境中测试自己的技能和工具的辅助工具,帮助Web开发人员更好地理解保护Web应用程序的过程,并帮助教师/学生在课堂环境中教授/学习Web应用程序安全。DVWA的目标是通过简单直接的界面练习一些最常见的Web漏洞,难度各不相同。请注意,该软件中