实际工作中,我们要使用PHP动态的创建PDF文档,目前有许多开源的PHP创建PDF的类库,今天我给大家来介绍一款优秀的PDF库,它就是TCPDF,TCPDF是一个用于快速生成PDF文件的PHP5函数包。TCPDF基于FPDF进行扩展和改进,增强了实用功能。
特性
TCPDF具有以下特性:
1、支持页面页脚;
2、支持HTML标签代码;
3、支持jpg/png/gif/svg图形图像;
4、支持表格;
5、支持中文字符;(有些PDF类不支持中文或者处理中文相当麻烦)
6、自动分页,自动页码,等等。
如何使用
您可以从TCPDF官网获取最新版本:http://www.tcpdf.org。官网提供了几十个示例以及说明文档,下载解压后一定要注意文件路径,如何使用TCPDF,可以从以下5个步骤完成:
1、require_once导入tcpdf.php文件及相关配置信息;
2、实例化TCPDF;
3、设置PDF文档的格式,包括文档信息、页眉、页尾、字体、外间距、图片边框、分页等;
4、导入PDF文档的内容,可以是单行或多行简单字符串,也可以HTML格式的字符串等;
5、输出PDF文档。
代码示例:
require_once('tcpdf.php');
//实例化
$pdf = new TCPDF('P', 'mm', 'A4', true, 'UTF-8', false);
// 设置文档信息
$pdf->SetCreator('Helloweba');
$pdf->SetAuthor('yueguangguang');
$pdf->SetTitle('Welcome to helloweba.com!');
$pdf->SetSubject('TCPDF Tutorial');
$pdf->SetKeywords('TCPDF, PDF, PHP');
// 设置页眉和页脚信息
$pdf->SetHeaderData('logo.png', 30, 'Helloweba.com', '致力于WEB前端技术在中国的应用',
array(0,64,255), array(0,64,128));
$pdf->setFooterData(array(0,64,0), array(0,64,128));
// 设置页眉和页脚字体
$pdf->setHeaderFont(Array('stsongstdlight', '', '10'));
$pdf->setFooterFont(Array('helvetica', '', '8'));
// 设置默认等宽字体
$pdf->SetDefaultMonospacedFont('courier');
// 设置间距
$pdf->SetMargins(15, 27, 15);
$pdf->SetHeaderMargin(5);
$pdf->SetFooterMargin(10);
// 设置分页
$pdf->SetAutoPageBreak(TRUE, 25);
// set image scale factor
$pdf->setImageScale(1.25);
// set default font subsetting mode
$pdf->setFontSubsetting(true);
//设置字体
$pdf->SetFont('stsongstdlight', '', 14);
$pdf->AddPage();
$str1 = '欢迎来到Helloweba.com';
$pdf->Write(0,$str1,'', 0, 'L', true, 0, false, false, 0);
//输出PDF
$pdf->Output('t.pdf', 'I');
保存后用浏览器打开,如果您的系统安装了PDF阅读器或者使用google chrome直接在浏览器中打开,否则会提示下载生成的PDF。
其他php生成PDF的常用类
FPDF(http://www.fpdf.org/)
HTML2PDF(http://html2pdf.seven49.net/)
HTML2PDF能够把一个HTML文本转换成一个打印机友好的PDF文件。这个PHP脚本构建在FPDF PHP脚本之上。
TCPDF(http://tcpdf.sourceforge.net/)
TCPDF是一个用于快速生成PDF文件的PHP5函数包。TCPDF基于FPDF进行扩展和改进。支持UTF-8,Unicode,HTML和XHTML。
html2ps(http://user.it.uu.se/~jan/html2ps.html)
html2ps 能够把带有图片,复杂表格(包含rowspan/colspan) ,layer/div和css样式的HTML转换成Postscript与PDF。 html2ps对CSS2.1支持非常好,并且很好地兼容不正确的HMTL。它甚至能够转换几乎是采用CSS设计的网站如msn.com。
HTML_ToPDF(http://www.rustyparts.com/pdf.php)
HTML_ToPDF能够把任何HTML文档转换成在任何平台和打印机下界面格式都一样的PDF文档。它包括支持图片转换,使用样式表来定制PDF文件和错误处理。
cPdfWriter(http://freshmeat.net/projects/cpdfwriter/)
cPdfWriter是一个能够输出PDF文档的PHP5 class。基于TCPDF,FPDF和其它相关脚本。
dompdf(http://www.digitaljunkies.ca/dompdf/)
dompdf是一个HTML到PDF的转换工具。它的核心是一个遵循大部份CSS2.1样式的Rendering引擎。dompdf采用样式驱动, 它能够下载并读取外部样式,整个样式标签和单个HTML元素的样式属性。它同样支持目当大部份HTML属性。

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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