How to implement the printing function of web pages in php

Steps and techniques for implementing PHP printing function In the process of web development, printing function is a very important requirement. I believe everyone has encountered situations where you need to print out certain content from a web page, such as receipts, reports, contracts, etc. This article will introduce how to use PHP to implement the printing function of web pages.

Below, we will briefly introduce the basic knowledge points that can realize the printing function:

• Screen CSS style and printing

  CSS style Web pages displayed on a screen and printed on paper are very different, so different CSS styles need to be used to adapt to different situations. The screen CSS style is mainly used to display the web page in the browser, while the print CSS style is mainly used to print out the content of the web page on paper. We need to define a special printing CSS style sheet to specify the style of the web page when printing.

• Print page settings

  When using PHP to implement the printing function, we need to set some parameters to ensure the accuracy and completeness of printing. For example, we need to specify the paper size, printing direction, margins, etc. for printing. Generally, we can set relevant parameters through CSS style sheets, JavaScript, or printer dialog boxes.

• JavaScript implements the printing function

  JavaScript can implement the printing function of the web page through the window.print method. This method will call the browser's print dialog box and print the entire content of the web page. We can add a print button to the page that needs to be printed and associate the button with JavaScript code to implement the printing function.

With the introduction of the above basic knowledge points, let’s start to introduce how to use PHP to implement the printing function of Web pages:

Step 1: Create a print CSS style sheet

We need to create a CSS style sheet specifically for printing to ensure that when printing a web page, it can be typeset and laid out according to our requirements. Here we can define some basic styles, such as font, font size, line spacing, margins, etc., and just reference the style sheet in the page that needs to be printed.

The following is a simple example for defining the basic style of a printed page:

@media print {
  body {
    font-family: Arial, sans-serif;
    font-size: 12pt;
    line-height: 1.5;
    margin: 0;
    padding: 0;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  
  p {
    margin: 0;
    padding: 0;
  }
}

The code in this style sheet will automatically take effect when printing. Among them, @media print means that the style sheet only takes effect when printing; attributes such as font-family, font-size, and line-height are used to define the font, font size, and line spacing; the margin and padding attributes are used to define the margins and line spacing of the page. Padding. In addition, the page-break-after attribute is used to define the paging rules of the page.

Step 2: Set printing parameters

When using PHP to implement the printing function, we need to set some parameters to ensure the accuracy and completeness of printing. These parameters can be set via CSS stylesheets or JavaScript code. The following are some commonly used printing parameters:

1. Printing direction

We can set the direction of the paper through the @page rule of the CSS style sheet.

The syntax is as follows:

@page {
  size: auto;
  orientation: landscape;
}

Among them, the size attribute is used to set the size of the paper, which can be set to auto, portrait or landscape; the orientation attribute is used to set the direction of the paper, which can be set to portrait. or landscape.

2. Print margins

We can set the margins of the page through the margin property of the CSS style sheet. The following is an example:

@page {
  margin: 1.5cm;
}

This style sheet indicates that when the page is printed, the margins on all sides are 1.5cm. What needs to be noted here is that we need to set appropriate margins for the printed page to avoid content being cut off or overflowing.

3. Print paging rules

We can set paging rules through the page-break-after property of the CSS style sheet. The following is an example:

h1, h2, h3, h4, h5, h6 {
  page-break-after: avoid;
}

This style sheet means that when printing, a page break will be automatically added after each title. What needs to be noted here is that we need to set appropriate paging rules according to actual needs to ensure the integrity and readability of printing.

Step 3: Write a PHP script

When writing a PHP script, we need to first introduce the print CSS style sheet and add a print button to the page. The following is an example:

<?php
  // 引入打印 CSS 样式表
  echo &#39;<link rel="stylesheet" type="text/css" href="print.css" media="print">&#39;;
?>

<!-- 添加打印按钮 -->
<button onclick="window.print()">打印</button>

<!-- 需要打印的内容 -->
<h1>这是一个标题</h1>
<p>这是一段内容。</p>

In this example, we first introduce the print CSS style sheet and add a print button to the page. At the same time, we also added some content that needs to be printed, such as a title and a piece of text. It should be noted that we need to put the content to be printed in a fixed container to ensure the accuracy and completeness of printing.

Step 4: Test the printing function

After completing the writing of the PHP script, we can use the browser to test.

• First we need to click the print button on the page to enter print preview mode.

• Then we can adjust the printing parameters and styles as needed.

• Finally click the "Print" button to complete printing.

Summarize

This article introduces how to use PHP to implement the printing function of Web pages. We need to first create a printing CSS stylesheet, define some basic styles and parameters, and then write a PHP script and test the printing functionality. In actual applications, we also need to perform some customized settings and debugging work according to actual needs.

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