Generate PDF files with PHP with FPDF_PHP tutorial
What is FPDF?
FPDF is a PHP class which allows to generate PDF files with pure PHP, that is to say without using the PDFlib library. The advantage is that PDFlib requires a fee for a commercial usage. F from FPDF stands for Free: you may use it for any kind of usage and modify it to suit your needs.
FPDF allows us to create pdf files without having to call PDFlib
here You can download the latest version under Windows:
http://www.fpdf.org/en/dl.php?v=152&f=zip
You can download the Chinese manual here:
http://www.fpdf.org/en/dl.php?id=72
If you want other versions, you can download it here:
http://www.fpdf.org /
This is also the official website of FPDF. If you have any questions, you can ask them there. The replies are very fast. I asked a question in the morning and they responded in the afternoon. But the times above are all American time.
The following is a very simple example of using FPDF to create a pdf file and add a page
define('FPDF_FONTPATH','fpdf152/font/');
require('fpdf152/fpdf.php');
$pdf = new FPDF;
$pdf->AddPage();
$pdf->Output('a.pdf' , 'D');
?>
Of course, you can also use $pdf->open(); to create a new pdf file
But here, Addpage() includes open( ), he completed the two steps of creating a new pdf file and adding 1 page at the same time
In the above example, define('FPDF_FONTPATH','fpdf152/font/'); defines the directory where font files are stored
After downloading the compressed package, you will see the font folder, just point to that folder
The above program cannot display anything yet
Now let’s add a few sentences
< ;?
define('FPDF_FONTPATH','fpdf152/font/');
require('fpdf152/fpdf.php');
$pdf = new FPDF;
$pdf-> AddPage();
$pdf->SetFont('arial');
$pdf->Text(5,20,'test pdf');
$pdf->Output(' a.pdf', 'D');
?>
SetFont() to set the font. This step must be done when calling FPDF for the first time, otherwise you will be prompted when the pdf file is opened. "No font defined" and nothing is displayed
It is best to define more commonly used fonts here, and Chinese is not supported.
To support Chinese or more biased fonts, you need to use AddFont(), but I failed the test for the time being. I hope someone who has passed it can give me some advice^^
Text() prints a string, the abscissa is 5. The ordinate is 20, and the string content is "test pdf"
Regarding the parameter 'D' in the final Output(), you can refer to the manual, it is written very clearly
The pdf file exported in this way will 'test pdf' is displayed.
If you are interested, add a picture
define('FPDF_FONTPATH','fpdf152/font/');
require('fpdf152/fpdf.php' );
$pdf = new FPDF;
$pdf->AddPage();
$pdf->SetFont('arial');
$pdf->Text(5, 20,'test pdf');
$pdf->Image('jianxin_mark.jpg', 5, 30, 60, 50);
$pdf->Output('a.pdf', ' D');
?>
Image() can insert pictures into pdf, preceded by the file name, including the path, 5 is the abscissa, 30 is the ordinate, 60 is the image width, 50 is the height
ok, so a pdf file with both text and pictures is created^^
In fact, there are many functions, which are written in the manual, but they are not very detailed. You need to research and discover them by yourself. ^^

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

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.


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