How to check an IF statement every 5sec in PHP? - php

Question

I have a li and inside that i have a div class="reload" that have some content that should be reloaded for every 10 sec.
<li class="b1">
<div class="reload">
</div>
</li><!--col-->
So therefore i have got a script that does just that.
<script type="text/javascript">
$('.b1').children('.reload').load('php/reload/reload.php'); // load the content at start
window.setInterval(function(e) {
$('.b1').children('.reload').load('php/reload/reload.php'); // reload the content every 10 sec
}, 10000);
In the reload.php i get some content from a database. It looks like this, sort of..
<?php
// login info
require("../../connection_to_database_login.php");
// My query
$result = mysqli_query($l,'SELECT * FROM abcd WHERE efg=1 LIMIT 1');
// include some stuff
$r = mysqli_fetch_row($result);for ($p = 0; $p < $r[4]; ++$p){include("../some/stuff_$p.php");};
// include a random picture script or just load a picture
if ($r[4] == 0){include ('getRandPic.php');}
else {echo ('<img src="images/picture.png" />');}
?>
So far so good.. everything works.
The getRandPic.php file.. select one random picture from a folder
<?php
$img_dir = "images/images";
$images = scandir($img_dir);
$html = array();
foreach($images as $img) {
if($img === '.' || $img === '..') {continue;}
if ( (preg_match('/.jpg/',$img)) || (preg_match('/.gif/',$img)) || (preg_match('/.tiff/',$img)) || (preg_match('/.png/',$img)) ) {
$html[] .= '<img class="img-responsive" src="'.$img_dir.$img.'" />';
}
else { continue; }
};
echo $html[rand(0,6)];
?>
So this works ok.
But the thing is, i want to check if it shall "include a random picture script or just load a picture" every 5sec.
Therefore i need to check "if ($r[4] == 0)" every 5 sec.
So my question is: Is there any other way to do that?

Answer 1

As you asked in the comment... This is a rough guide only. You will have to develop and write your own code based on this guide.
Step 1a: optional
Make an ajax call from your webpage to the server. to get image file names.
Step 1b:
On server side in php file perform DB operation.
Let assume you have a table imageTable and column name images so you would read from DB using query SELECT images FROM imageTable
You will have to change the query, add condition (e.g. all images with animal and cute tags) to it and if you want limit the number of files that you want to randomize then you will have to add that as well.
Step 2:
Once you read from DB, as you are already doing, read all image names and put it in json format (json_encode). I personally prefer json. If you prefer, you can also return all names in simple string where names are separated by comma.
Step 3:
Store your response in JS.
var imagesArray = new Array();
$.ajax({
type: 'post',
url: pathtophpfile,
success: function(htmll) {
// get object with all data
imagesArray= JSON.parse(htmll);
},
});
Step 4:
Once you have it in your js object named imagesArray, use setInetval to perform task every 5 seconds.
Read a random value from 0 to imagesArrays length, and change the source of your image tag, <img class="img-responsive" src="+ randomimage +" />

Answer 2

Periodic updater will do your task.
Use ajax framework, it will reduce your db connection burden at the server side.
Have a look at it. It is a simple and nice way to achieve your task.
http://prototypejs.org/doc/latest/ajax/Ajax/PeriodicalUpdater/