Multiple ways to randomly display images in php_PHP tutorial

$handle = opendir('./'); //Current directory
while (false !== ($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 file names that meet the conditions into the array
}
}
}
$suiji=array_rand($array); //Use array_rand function to randomly extract a unit from the array
?>

Example 2

/**********************************************
* Filename : img.php
* Author : freemouse
* web : www.zhutiai.com * email :freemouse1981@gmail.com
* Date : 2010/12/27
* Usage:
*
*
***********************************************/
if($_GET['folder']){
$folder=$_GET['folder'];
}else{
$folder='/images/';
}
//The location where image files are 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]");
?>

readrand.php (This program actually generates a web page special effects language)
$arrayall=file("tp.txt"); Read the contents of tp.txt into array
$arrays=count($arrayall);
if ($arrays==1){//because rand(0,0) is wrong
$selectrand=0;
}else{
srand((double)microtime()*1000000);//Set random number seed
$selectrand=rand(0,$arrays-1);
}
$exstr=explode(chr(9),$arrayall[$selectrand]);//Randomly pick one out of all and split
?>
document.write('');

HTML file

(You can put scripty where you need, and add the setTimeout() function to achieve regular refresh)

Random ad code

#########Random ad display##########
function myads(){
$dir="ads"; #Set the directory where records are stored
//$dir="ads"; #Set the directory where records are stored
$ads="$dir/ads.txt"; #Set advertising code file
$log ="$dir/ads.log"; #Set ip record file

$ads_lines=file($ads);
$lines=count($ads_lines);#Total number of lines in the file

####Read the total number of ads $ads_count and the number of displays into the array $display_array########
$ads_count=0;
$display_count=0;
for ($i=0;$i<$lines;$i++){
If((!strcmp(substr($ads_lines[$i],0,7),"display"))){
$ads_count+=1;
$display_array[$ads_count]=substr($ads_lines[$i],8);
$display_count+=$display_array[$ads_count];
}
}
####Decided to randomly display the serial number $display_rand#####
srand((double)microtime()*1000000);
$display_rand = rand(1,$display_count);

###Determine the advertising serial number $ads_num######
$pricount=0;
$ads_num=1;
for($i=1; $i<=$ads_count; $i++) {
$pricount += $display_array[$i];
if ($display_rand<=$pricount) {$ads_num=$i;break;}
}

#####Play ads########
$num=0;
$flag=0;

for($i=0;$i<$lines;$i++){
If((!strcmp(substr($ads_lines[$i],0,7),"display"))){$num++;}
If(($num==$ads_num)and($flag==0)){$flag=1;continue;}
if(($flag==1)and strcmp($ads_lines[$i][0],"#")){echo $ads_lines[$i];continue;}
if(($flag==1)and(!(strcmp($ads_lines[$i][0],"#")))){break;}
}
####Record the number of times ads are displayed#########
$fp=fopen($log,"a");
fputs($fp,date( "Y-m-d H:i:s " ).getenv("REMOTE_ADDR")."==>".$ads_num."n");
fclose($fp);
}
?>

Advertising code file ads.txt

The following is the quoted content:
########Each ad code is separated by '#', display is the display weighting number, the larger the number, the more times it will be displayed ######
display=10


###############################
display=10