PHP mt_rand() Function

<?php
echo(mt_rand() . "<br>");
echo(mt_rand() . "<br>");
echo(mt_rand(10,100));
?>

Syntax
mt_rand();

or

mt_rand(min,max);

php version เก่า

<?php
echo rand() . "\n";
echo rand() . "\n";

echo rand(5, 15);
?>

ตัวอย่างการนำไปใช้
โดยสร้าง 1.css และ 2.css ใน folder เพื่อสุ่ม css

<link href="/styles/<?php echo mt_rand(1,2); ?>.css" rel="stylesheet" type="text/css"/>

ยังมีวิธีอื่นๆ

สำหรับ wordpress
How to enqueue a random css style?
I want a random CSS style file to load on my site with each page view so I can play with colors backgrounds.
So I put all my styles in a folder, I named them 1.css, 2.css, etc. and I have added:

<link rel='stylesheet' id='name-random-color-css' href='http://www.url.com/wp-content/themes/themename/inc/rcolor/<?php echo mt_rand(1, 9) ?>.css' type='text/css' media='all' />

in the header.

It works but I know this is not the proper way to include styles in WordPress. I should utilize the wp_enqueue_style function in the functions.php file, but I don’t know how to combine the two to make it work.

ตอบ
ใส่ใน functions.php

function enqueue_random_style() {
        wp_enqueue_style( 'style-name', get_stylesheet_directory_uri() . '/inc/rcolor/' . mt_rand(1, 9));
}    
add_action( 'wp_enqueue_scripts', 'enqueue_random_style' );

https://wordpress.stackexchange.com/questions/164079/how-to-enqueue-a-random-css-style

การสุ่ม background

https://teamtreehouse.com/community/random-background-color