Summary of random display image methods in php
This article shares a php function for randomly displaying images. You can randomly display images stored in a specified folder. If you are interested, study it.
Php uses the rand () function to generate a random number. This function can generate a number within a specified range.
This code randomly selects an image through the random number generated
?
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
<Html> <Body> <? Php Srand (microtime () * 1000000 ); $ Num = rand (1, 4 );
Switch ($ num) { Case 1: $ image_file = "/home/images/alfa.jpg "; Break; Case 2: $ image_file = "/home/images/ferrari.jpg "; Break; Case 3: $ image_file = "/home/images/jaruar.jpg "; Break; Case 4: $ image_file = "/home/images/porsche.jpg "; Break; } Echo "Random Image: "; ?> </Body> </Html> |
Method 2:
?
| 1 2 3 4 5 6 7 8 9 10 11 12 13 |
<? $ Handle = opendir ('./'); // Current Directory While (false! ==( $ File = readdir ($ handle) {// traverse the directory where the php tutorial file is located List ($ filesname, $ kzm) = explode (".", $ file); // get the extension If ($ kzm = "gif" or $ kzm = "jpg") {// file filtering If (! Is_dir ('./'. $ file) {// folder Filtering $ Array [] = $ file; // Save the qualified file name to an array } } } $ Suiji = array_rand ($ array); // use the array_rand function to randomly extract a unit from the array. ?> "> |
Method 3:
?
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
<? Php /*************************************** ******* * Filename: img. php * Author: freemouse * Usage: * * **************************************** *******/ If ($ _ GET ['folder']) { $ Folder = $ _ GET ['folder']; } Else { $ Folder = '/images /'; } // The location where the image file is stored $ Path = $ _ SERVER ['document _ root']. "/". $ folder; $ Files = array (); If ($ handle = opendir ("$ path ")){ While (false! ==( $ File = readdir ($ handle ))){ If ($ file! = "." & $ File! = ".."){ If (substr ($ file,-3) = 'gif' | substr ($ file,-3) = 'jpg ') $ files [count ($ files)] = $ file; } } } Closedir ($ handle ); $ Random = rand (0, count ($ files)-1 ); If (substr ($ files [$ random],-3) = 'gif') header ("Content-type: image/gif "); Elseif (substr ($ files [$ random],-3) = 'jpg ') header ("Content-type: image/jpeg "); Readfile ("$ path/$ files [$ random]"); ?> |
The above is all the content of this article. I hope you will like it.
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
