PHP draws a dotted line

php editor Yuzai has carefully prepared a tutorial for everyone on how to use PHP to draw a dotted line. In web design, dotted lines are often used to separate content or decorate pages, giving users a better visual experience. Through this tutorial, you will learn how to use PHP's GD library function to draw beautiful dotted lines to make your web pages more attractive!

How to draw a dotted line using PHP

Overview

Dotted lines are a common graphic element that are widely used in various applications. In php, you can use the GD library to draw dashed lines.

Steps to draw a dotted line

1. Initialize image resources

$image = imagecreate(600, 400);

2. Set dash mode

To set dash mode, use the imageSetStyle function:

$dash_array = array(10, 5);
imageSetStyle($image, $dash_array);

3. Draw a dotted line

Use the imageline function to draw a dotted line:

imageline($image, 100, 100, 500, 300, imageColorAllocate($image, 255, 0, 0));

4. Output image

Use the imagepng function to output the image:

header("Content-Type: image/png");
imagepng($image);

Custom dotted line mode

You can create different dotted line modes by modifying the dotted line mode array. The first value in the array specifies the length of the dashed line segments, and the second value specifies the length of the gap between the dashed lines. For example, to create a dashed line with a 10-pixel dash segment and a 5-pixel gap, you would use the following mode:

$dash_array = array(10, 5);

Sample code

The following example code draws a red dashed line with a 10-pixel dash segment and a 5-pixel gap:

Other tips

• The GD library can only create black and white dashed lines. To create colored dashed lines, use another image library such as ImageMagick or Imagick.
• You can also use CSS to draw dashed lines. For more information, see CSS border-style property.

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