In website development, PHP and CSS are very important technologies. PHP can be used to handle the background logic of the website, while CSS is used to beautify the UI design of the website. If you want to combine the two and add some style to your website, then all you need to do is set up the CSS.

In PHP, the main methods of setting CSS are as follows:

1. Write the CSS code into the PHP file

Write the CSS code into the PHP file , you can define styles directly in PHP files, which can save the reference to external CSS files and reduce the loading time of the website.

For example:

header("Content-type: text/css");
?>
body{

background-color: #000000; color: #ffffff;

}

In this example, we add a "header" command to tell the browser that this file will output CSS code, and then write the CSS code directly in the PHP file. When a PHP file is referenced, the browser will automatically parse the CSS code and apply it to the corresponding HTML element.

2. Externally linked CSS files

Using externally linked CSS files in PHP files can greatly save the amount of code in PHP files and make the code more readable and maintainable. At the same time, externally linked CSS files can also realize the reuse of CSS files, so that one CSS code can be referenced by multiple PHP files.

For example:

//index.php file

My Website
 
Welcome to my website.

//style.css file
body{

background-color: #000000; color: #ffffff;

}

In this example, we use the link tag to link the style.css file to the index.php file. When the browser parses the index.php file, it automatically downloads and parses the style.css file and applies the style to the corresponding HTML element.

3. Internal CSS styles

Internal CSS styles are a way of placing CSS code within HTML code. In a PHP file, you can set CSS by outputting HTML code with CSS styles.

For example:

//index.php file

My Website
 
Welcome to my website.

In this example, we use the style tag to convert the CSS code Put it in HTML code. When the browser parses the index.php file, it automatically applies CSS styles to the corresponding HTML elements.

It should be noted that the above three ways of setting CSS can be used in PHP files. For developers, they should choose an appropriate way to set CSS based on actual needs and project characteristics.

If you need to modify the styles of multiple pages at the same time, it is recommended to use external link CSS files, which can improve code reusability and maintainability. If you need to modify the style of a page individually and don't want to add a lot of code to the CSS file, you can consider using internal CSS styles. If the web page only needs to add some simple styles, then just write the CSS code in the PHP file.

Of course, in the process of setting up CSS, you also need to pay attention to some details, such as CSS selectors, style rules, etc. I hope this article helps you better understand how to set CSS in PHP.

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