I'm working on a one-way messaging system using server-sent events. I have a file (server.html) which sends the contents of a textarea to a PHP file (handler.php).
function sendSubtitle(val) {
var xhr = new XMLHttpRequest();
var url = "handler.php";
var postdata = "s=" + val;
xhr.open('POST', url, true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send(postdata);
//alert(val);
}
This works (alert(val) displays the text in the textarea).
My handler.php code looks like this:
header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');
$stringData = $_POST['s'];
echo "data: Data is {$stringData}\n\n";
flush();
And the relevant part of my SSE receiver file (client.html) is as follows:
if(typeof(EventSource) !== "undefined") {
var source = new EventSource("handler.php");
source.onmessage = function(event) {
var textarea = document.getElementById('subtitles');
textarea.value += event.data + "<br>";
textarea.scrollTop = textarea.scrollHeight;
};
} else {
document.getElementById("subtitles").value = "Server-sent events not supported.";
}
The problem is that client.html only displays "data: Data is", so the text from server.html is getting lost somewhere along the way. I imagine it's the PHP code that's falling over, but I can't work out what's wrong. If anyone can help, I'd appreciate it.
EDIT
I chose to use SSE as opposed to websockets as I only need one-way communication: server.html should push the contents of its textarea to client.html whenever it changes. All the examples of SSE that I've looked at (and I've looked at a lot!) send "automatic" time-based data. I haven't seen any that use real-time user input. So perhaps I should clarify my original question and ask, "How can I use SSE to update a DIV (or whatever) in web page B whenever the user types in a textarea in web page A?"
UPDATE
I've narrowed the issue down to the while loop in the PHP file and have therefore asked a new question: Server-side PHP event page not loading when using while loop
Assuming you want to send a value from server.html and a value at client.html will be automatically updated...
You will need to store the new value somewhere because multiple instances of a script do not share variables just like that. This new value can be stored in a file, database or as a session variable, etc.
Steps:
Send new value to phpScript1 with clientScript1.
Store new value with phpScript1.
Connect clientScript2 to phpScript2.
Send stored value to clientScript2 if it is changed.
Getting the new value 'on the fly' means phpScript2 must loop execution and send a message to clientScript2 whenever the value has been changed by clientScript1.
Of course there are more and different approaches to achieve the same results.
Below there's some code from a scratchpad I've used in previous project.
Most parts come from a class (which is in development) so I had to adopt quite a lot of code. Also I've tried to fit it into your existing code.
Hopefully I didn't introduce any errors.
Do note I did not take any validation of your value into account! Also the code isn't debugged or optimized, so it's not ready for production.
Client side (send new value, e.g. your code):
function sendSubtitle(val) {
var xhr = new XMLHttpRequest();
var url = "handler.php";
var postdata = "s=" + val;
xhr.open('POST', url, true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send(postdata);
//alert(val);
}
Server side (store new value):
<?php
session_start();
$_SESSION['s'] = $_POST['s'];
Client side (get new value):
//Check for SSE support at client side.
if (!!window.EventSource) {
var es = new EventSource("SSE_server.php");
} else {
console.log("SSE is not supported by your client");
//You could fallback on XHR requests.
}
//Define eventhandler for opening connection.
es.addEventListener('open', function(e) {
console.log("Connection opened!");
}, false);
//Define evenhandler for failing SSE request.
es.addEventListener('error', function(event) {
/*
* readyState defines the connection status:
* 0 = CONNECTING: Connecting
* 1 = OPEN: Open
* 2 = CLOSED: Closed
*/
if (es.readyState == EventSource.CLOSED) {
// Connection was closed.
} else {
es.close(); //Close to prevent a reconnection.
console.log("EventSource failed.");
}
});
//Define evenhandler for any response recieved.
es.addEventListener('message', function(event) {
console.log('Response recieved: ' + event.data);
}, false);
// Or define a listener for named event: event1
es.addEventListener('event1', function(event) {
var response = JSON.parse(event.data);
var textarea = document.getElementById("subtitles");
textarea.value += response + "<br>";
textarea.scrollTop = textarea.scrollHeight;
});
Server side (send new value):
<?php
$id = 0;
$event = 'event1';
$oldValue = null;
session_start();
//Validate the clients request headers.
if (headers_sent($file, $line)) {
header("HTTP/1.1 400 Bad Request");
exit('Headers already sent in %s at line %d, cannot send data to client correctly.');
}
if (isset($_SERVER['HTTP_ACCEPT']) && $_SERVER['HTTP_ACCEPT'] != 'text/event-stream') {
header("HTTP/1.1 400 Bad Request");
exit('The client does not accept the correct response format.');
}
//Disable time limit
#set_time_limit(0);
//Initialize the output buffer
if(function_exists('apache_setenv')){
#apache_setenv('no-gzip', 1);
}
#ini_set('zlib.output_compression', 0);
#ini_set('implicit_flush', 1);
while (ob_get_level() != 0) {
ob_end_flush();
}
ob_implicit_flush(1);
ob_start();
//Send the proper headers
header('Content-Type: text/event-stream; charset=UTF-8');
header('Cache-Control: no-cache');
header('X-Accel-Buffering: no'); // Disables FastCGI Buffering on Nginx
//Record start time
$start = time();
//Keep the script running
while(true){
if((time() - $start) % 300 == 0){
//Send a random message every 300ms to keep the connection alive.
echo ': ' . sha1( mt_rand() ) . "\n\n";
}
//If a new value hasn't been sent yet, set it to default.
session_start();
if (!array_key_exists('s', $_SESSION)) {
$_SESSION['s'] = null;
}
//Check if value has been changed.
if ($oldValue !== $_SESSION['s']) {
//Value is changed
$oldValue = $_SESSION['s'];
echo 'id: ' . $id++ . PHP_EOL; //Id of message
echo 'event: ' . $event . PHP_EOL; //Event Name to trigger the client side eventhandler
echo 'retry: 5000' . PHP_EOL; //Define custom reconnection time. (Default to 3000ms when not specified)
echo 'data: ' . json_encode($_SESSION['s']) . PHP_EOL; //Data to send to client side eventhandler
//Note: When sending html, you might need to encode with flags: JSON_HEX_QUOT | JSON_HEX_TAG
echo PHP_EOL;
//Send Data in the output buffer buffer to client.
#ob_flush();
#flush();
}
//Close session to release the lock
session_write_close();
if ( connection_aborted() ) {
//Connection is aborted at client side.
break;
}
if((time() - $start) > 600) {
//break if the time exceeds the limit of 600ms.
//Client will retry to open the connection and start this script again.
//The limit should be larger than the time needed by the script for a single loop.
break;
}
//Sleep for reducing processor load.
usleep(500000);
}
You called handler.php first time in the server.html and again in client.html. Both are different processes. The variable state won't be retained in the web server. You need to store it somewhere if you want that value in another PHP process. May be you can use sessions or database.
While using sessions you can store the values in two files like:
<?php
//server.php
session_start();
$_SESSION['s'] = $_POST['s'];
And in client.php
<?php
//client.php
session_start();
echo "data: Data is ".$_SESSION['s']."\n\n";
I want to design central control timer with php and any other client side script.
the basically things that need to keep in mind is that : timer will be visible on my website,so may be hundred of user are currently logged in to my website. Now whenever admin reset the timer on the same point it should reflect to all the client machine. so basic is need to keep synchronous timing all the machine.
What I did
I have used client side countdown timer (http://keith-wood.name/countdown.html)
and in background I am calling ajax on every second to check reset is pressed or not.
but the problem is its not keeping synchronous in all the client machine.
some time time gape between two machine is marked.so how to implement it?
code:
$('#shortly').countdown({until: shortly,
onExpiry: liftOff, onTick: watchCountdown});
$('#shortlyStart').click(function() {
shortly = new Date();
shortly.setSeconds(shortly.getSeconds() + 5.5);
$('#shortly').countdown('option', {until: shortly});
});
function liftOff() {
alert('We have lift off!');
}
function watchCountdown(periods) {
$('#monitor').text('Just ' + periods[5] + ' minutes and ' +
periods[6] + ' seconds to go');
}
timerset.php. This file creates the file for the server side to push the finish time.
<?php
$year=htmlspecialchars($_GET['year']);
$month=htmlspecialchars($_GET['month']);
$day=htmlspecialchars($_GET['day']);
$hour=htmlspecialchars($_GET['hour']+2);//NBNBNB the +2 changes according to YOUR timezone.
$minute=htmlspecialchars($_GET['minute']);
$second=htmlspecialchars($_GET['second']);
$timestring=$year.":".$month.":".$day.":".$hour.":".$minute.":".$second;
echo $timestring."<br/>";
$filename = 'timerserver.php';
$file = fopen($filename, 'w');
rewind($file);
fwrite($file,"<?php\n");
fwrite($file, "header('Content-Type: text/event-stream');\n");
fwrite($file, "header('Cache-Control: no-cache');\n");
fwrite($file, "header('connection:keep-alive');\n");
fwrite($file, "\$starttime=\"$timestring\";\n");
fwrite($file, "echo \"data:{\$starttime}\\n\\n\";\n");
fwrite($file, "ob_flush();");
fwrite($file,"flush();");
fwrite($file,"sleep(3);");
fwrite($file,"?>\n");
fflush($file);
ftruncate($file, ftell($file));
fclose($file);
flush();
?>
timer.php. This file receives the finish time and updates the displayed time.
<html>
<header>
</header>
<body>
<script>
var source = new EventSource("timerserver.php");
var mystarttime="00:00";
source.onmessage = function(event)
{
mystarttime=event.data;
};
setInterval(function () {test(mystarttime)}, 1000);
function test(intime)
{
var timestring=intime;
var split = timestring.split(':');
var currentdate=new Date();
var finishtime=new Date(split[0],split[1]-1,split[2],split[3],split[4],split[5],0);
var timediff=new Date(finishtime-currentdate);
var year=timediff.getUTCFullYear();
var minutes=timediff.getUTCMinutes();
var seconds=timediff.getUTCSeconds();
var currentMinutes = ("0" + minutes).slice(-2);
var currentSeconds = ("0" + seconds).slice(-2);
if (year<1970)
{
document.getElementById("result").innerHTML="Time is up"
}
else
document.getElementById("result").innerHTML = currentMinutes+":"+currentSeconds;
}
</script>
<div id="result">Fetching time...</div>
</body>
</html>
timerform.php . One method of updating the time.
<?php
echo "<b>NB : Time is in UTC Timezone</b><br/><hr/>";
date_default_timezone_set("UTC");
$currentdatetime=date("Y-m-d H:i:s");
$year=date("Y");
$month=date("m");
$day=date("j");
$hour=date("H");
$minute=date("i");
$second=0;
echo $currentdatetime."<hr/>";
?>
<form action="timerreset.php" method="GET">
Year <input name="year" value="<?php echo $year;?>"/><br/>
Month <input name="month" value="<?php echo $month;?>"/><br/>
Day <input name="day" value="<?php echo $day;?>"/><br/><br/>
Hour <input name="hour" value="<?php echo $hour;?>"/><br/>
Minute <input name="minute" value="<?php echo $minute+1;?>"/><br/>
Second <input name="second" value="<?php echo $second;?>"/><br/>
<input type="submit"/>
</form>
<?php
flush();
?>
NB, Use UTC time to cater for different clients in different timezones.
I have the above code working on both my localhost (Windows) and at SouthCoastHosting (Linux), so let me know if you have any problems.
To use it open a tab to southcoasthosting.com/timer/timerform.php and another tab to southcoasthosting.com/timer/timer.php. Use the timer form to change the finish time and you will see the time chage in timer.php. Due to the nature of EventSource there will always be at best a 3 second delay before updating the timer. Depending on your clients connection speed to the server there may be further delays. I chose to send a finish time so that the client will not lag due to these delays.
I hope that all makes sense. Let me know otherwise.
Try this instead, using HTML5's server-side-events.
<?php
header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');
$reset = "true";
echo "data: reset: {$reset}\n\n";
flush();
?>
on the server, and
<script>
var source = new EventSource("gsim_server.php");
source.onmessage = function(event)
{
document.getElementById("result").innerHTML = event.data;
};
</script>
<div id="result">test</div>
on the client (asuming the server file is in the same folder and is called 'gsim_server.php'. This is just a basic example, but you could use the value passed to decide wether to reset or not. Hope that helps.
I need to find the screen resolution of a users screen who visits my website?
You can't do it with pure PHP. You must do it with JavaScript. There are several articles written on how to do this.
Essentially, you can set a cookie or you can even do some Ajax to send the info to a PHP script. If you use jQuery, you can do it something like this:
jquery:
$(function() {
$.post('some_script.php', { width: screen.width, height:screen.height }, function(json) {
if(json.outcome == 'success') {
// do something with the knowledge possibly?
} else {
alert('Unable to let PHP know what the screen resolution is!');
}
},'json');
});
PHP (some_script.php)
<?php
// For instance, you can do something like this:
if(isset($_POST['width']) && isset($_POST['height'])) {
$_SESSION['screen_width'] = $_POST['width'];
$_SESSION['screen_height'] = $_POST['height'];
echo json_encode(array('outcome'=>'success'));
} else {
echo json_encode(array('outcome'=>'error','error'=>"Couldn't save dimension info"));
}
?>
All that is really basic but it should get you somewhere. Normally screen resolution is not what you really want though. You may be more interested in the size of the actual browser's view port since that is actually where the page is rendered...
Directly with PHP is not possible but...
I write this simple code to save screen resolution on a PHP session to use on an image gallery.
<?php
session_start();
if(isset($_SESSION['screen_width']) AND isset($_SESSION['screen_height'])){
echo 'User resolution: ' . $_SESSION['screen_width'] . 'x' . $_SESSION['screen_height'];
} else if(isset($_REQUEST['width']) AND isset($_REQUEST['height'])) {
$_SESSION['screen_width'] = $_REQUEST['width'];
$_SESSION['screen_height'] = $_REQUEST['height'];
header('Location: ' . $_SERVER['PHP_SELF']);
} else {
echo '<script type="text/javascript">window.location = "' . $_SERVER['PHP_SELF'] . '?width="+screen.width+"&height="+screen.height;</script>';
}
?>
New Solution If you need to send another parameter in Get Method (by Guddu Modok)
<?php
session_start();
if(isset($_SESSION['screen_width']) AND isset($_SESSION['screen_height'])){
echo 'User resolution: ' . $_SESSION['screen_width'] . 'x' . $_SESSION['screen_height'];
print_r($_GET);
} else if(isset($_GET['width']) AND isset($_GET['height'])) {
$_SESSION['screen_width'] = $_GET['width'];
$_SESSION['screen_height'] = $_GET['height'];
$x=$_SERVER["REQUEST_URI"];
$parsed = parse_url($x);
$query = $parsed['query'];
parse_str($query, $params);
unset($params['width']);
unset($params['height']);
$string = http_build_query($params);
$domain=$_SERVER['PHP_SELF']."?".$string;
header('Location: ' . $domain);
} else {
$x=$_SERVER["REQUEST_URI"];
$parsed = parse_url($x);
$query = $parsed['query'];
parse_str($query, $params);
unset($params['width']);
unset($params['height']);
$string = http_build_query($params);
$domain=$_SERVER['PHP_SELF']."?".$string;
echo '<script type="text/javascript">window.location = "' . $domain . '&width="+screen.width+"&height="+screen.height;</script>';
}
?>
PHP is a server side language - it's executed on the server only, and the resultant program output is sent to the client. As such, there's no "client screen" information available.
That said, you can have the client tell you what their screen resolution is via JavaScript. Write a small scriptlet to send you screen.width and screen.height - possibly via AJAX, or more likely with an initial "jump page" that finds it, then redirects to http://example.net/index.php?size=AxB
Though speaking as a user, I'd much prefer you to design a site to fluidly handle any screen resolution. I browse in different sized windows, mostly not maximized.
Easiest way
<?php
//-- you can modified it like you want
echo $width = "<script>document.write(screen.width);</script>";
echo $height = "<script>document.write(screen.height);</script>";
?>
I found using CSS inside my html inside my php did the trick for me.
<?php
echo '<h2 media="screen and (max-width: 480px)">';
echo 'My headline';
echo '</h2>';
echo '<h1 media="screen and (min-width: 481px)">';
echo 'My headline';
echo '</h1>';
?>
This will output a smaller sized headline if the screen is 480px or less.
So no need to pass any vars using JS or similar.
You can check it like below:
if(strstr(strtolower($_SERVER['HTTP_USER_AGENT']), 'mobile') || strstr(strtolower($_SERVER['HTTP_USER_AGENT']), 'android')) {
echo "mobile web browser!";
} else {
echo "web browser!";
}
This is a very simple process. Yes, you cannot get the width and height in PHP. It is true that JQuery can provide the screen's width and height. First go to https://github.com/carhartl/jquery-cookie and get jquery.cookie.js. Here is example using php to get the screen width and height:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Test</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<script src="js/jquery.cookie.js"></script>
<script type=text/javascript>
function setScreenHWCookie() {
$.cookie('sw',screen.width);
$.cookie('sh',screen.height);
return true;
}
setScreenHWCookie();
</script>
</head>
<body>
<h1>Using jquery.cookie.js to store screen height and width</h1>
<?php
if(isset($_COOKIE['sw'])) { echo "Screen width: ".$_COOKIE['sw']."<br/>";}
if(isset($_COOKIE['sh'])) { echo "Screen height: ".$_COOKIE['sh']."<br/>";}
?>
</body>
</html>
I have a test that you can execute: http://rw-wrd.net/test.php
Use JavaScript (screen.width and screen.height IIRC, but I may be wrong, haven't done JS in a while). PHP cannot do it.
Fully Working Example
I couldn't find an actual working PHP example to "invisibly" (without URL parameters) return client screen size, and other properties, to server-side PHP, so I put this example together.
JS populates and submits a hidden form (scripted by PHP from an array of JS properties), POSTing to itself (the data now available in PHP) and returns the data in a table.
(Tested in "several" browsers.)
<!DOCTYPE html>
<html>
<head>
<title>*Client Info*</title>
<style>table,tr{border:2px solid gold;border-collapse:collapse;}td{padding:5px;}</style>
</head>
<body>
<?php
$clientProps=array('screen.width','screen.height','window.innerWidth','window.innerHeight',
'window.outerWidth','window.outerHeight','screen.colorDepth','screen.pixelDepth');
if(! isset($_POST['screenheight'])){
echo "Loading...<form method='POST' id='data' style='display:none'>";
foreach($clientProps as $p) { //create hidden form
echo "<input type='text' id='".str_replace('.','',$p)."' name='".str_replace('.','',$p)."'>";
}
echo "<input type='submit'></form>";
echo "<script>";
foreach($clientProps as $p) { //populate hidden form with screen/window info
echo "document.getElementById('" . str_replace('.','',$p) . "').value = $p;";
}
echo "document.forms.namedItem('data').submit();"; //submit form
echo "</script>";
}else{
echo "<table>";
foreach($clientProps as $p) { //create output table
echo "<tr><td>".ucwords(str_replace('.',' ',$p)).":</td><td>".$_POST[str_replace('.','',$p)]."</td></tr>";
}
echo "</table>";
}
?>
<script>
window.history.replaceState(null,null); //avoid form warning if user clicks refresh
</script>
</body>
</html>
The returned data is extract'd into variables. For example:
window.innerWidth is returned in $windowinnerWidth
You can try RESS (RESponsive design + Server side components), see this tutorial:
http://www.lukew.com/ff/entry.asp?1392
You can set window width in cookies using JS in front end and you can get it in PHP:
<script type="text/javascript">
document.cookie = 'window_width='+window.innerWidth+'; expires=Fri, 3 Aug 2901 20:47:11 UTC; path=/';
</script>
<?PHP
$_COOKIE['window_width'];
?>
I don't think you can detect the screen size purely with PHP but you can detect the user-agent..
<?php
if ( stristr($ua, "Mobile" )) {
$DEVICE_TYPE="MOBILE";
}
if (isset($DEVICE_TYPE) and $DEVICE_TYPE=="MOBILE") {
echo '<link rel="stylesheet" href="/css/mobile.css" />'
}
?>
Here's a link to a more detailed script: PHP Mobile Detect
Here is the Javascript Code: (index.php)
<script>
var xhttp = new XMLHttpRequest();
xhttp.open("POST", "/sqldb.php", true);
xhttp.send("screensize=",screen.width,screen.height);
</script>
Here is the PHP Code: (sqldb.php)
$data = $_POST['screensize'];
$pdo = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');
$statement = $pdo->prepare("UPDATE users SET screen= :screen WHERE id = $userid");
$statement->execute(array('screen' => $data));
I hope that you know how to get the $userid from the Session,
and for that you need an Database with the Table called users, and an Table inside users called screen ;=)
Regards KSP
The only way is to use javascript, then get the javascript to post to it to your php(if you really need there res server side). This will however completly fall flat on its face, if they turn javascript off.
JS:
$.ajax({
url: "ajax.php",
type: "POST",
data: "width=" + $("body").width(),
success: function(msg) {
return true;
}
});
ajax.php
if(!empty($_POST['width']))
$width = (int)$_POST['width'];
This can be done easily using cookies. This method allows the page to check the stored cookie values against the screen height and width (or browser view port height and width values), and if they are different it will reset the cookie and reload the page. The code needs to allow for user preferences. If persistant cookies are turned off, use a session cookie. If that doesn't work you have to go with a default setting.
Javascript: Check if height & width cookie set
Javascript: If set, check if screen.height & screen.width (or whatever you want) matches the current value of the cookie
Javascript: If cookie not set or it does not match the current value, then:
a. Javascript: create persistent or session cookie named (e.g.) 'shw' to value of current screen.height & screen.width.
b. Javascript: redirect to SELF using window.location.reload(). When it reloads, it will skip the step 3.
PHP: $_COOKIE['shw'] contains values.
Continue with PHP
E.g., I am using some common cookie functions found on the web. Make sure setCookie returns the correct values.
I put this code immediately after the head tag. Obviously the function should be in a a source file.
<head>
<script src="/include/cookielib.js"></script>
<script type=text/javascript>
function setScreenHWCookie() {
// Function to set persistant (default) or session cookie with screen ht & width
// Returns true if cookie matches screen ht & width or if valid cookie created
// Returns false if cannot create a cookies.
var ok = getCookie( "shw");
var shw_value = screen.height+"px:"+screen.width+"px";
if ( ! ok || ok != shw_value ) {
var expires = 7 // days
var ok = setCookie( "shw", shw_value, expires)
if ( ok == "" ) {
// not possible to set persistent cookie
expires = 0
ok = setCookie( "shw", shw_value, expires)
if ( ok == "" ) return false // not possible to set session cookie
}
window.location.reload();
}
return true;
}
setScreenHWCookie();
</script>
....
<?php
if( isset($_COOKIE["shw"])) {
$hw_values = $_COOKIE["shw"];
}
PHP works only on server side, not on user host. Use JavaScript or jQuery to get this info and send via AJAX or URL (?x=1024&y=640).
The quick answer is no, then you are probably asking why can't I do that with php. OK here is a longer answer. PHP is a serverside scripting language and therefor has nothing to do with the type of a specific client. Then you might ask "why can I then get the browser agent from php?", thats because that information is sent with the initial HTTP headers upon request to the server. So if you want client information that's not sent with the HTTP header you must you a client scripting language like javascript.
For get the width screen or the height screen
1- Create a PHP file (getwidthscreen.php) and write the following commands in it
PHP (getwidthscreen.php)
<div id="widthscreenid"></div>
<script>
document.getElementById("widthscreenid").innerHTML=screen.width;
</script>
2- Get the width screen through a cURL session by the following commands
PHP (main.php)
$ch = curl_init( 'http://hostname/getwidthscreen.php' );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
$result = curl_exec( $ch );
print_r($result);
curl_close( $ch );
Well, I have another idea, thanks to which it is 90% possible in a very simple way using pure PHP. We will not immediately know the exact screen resolution, but we will find out whether the user is using a computer (higher resolution) or a phone (lower resolution) and thanks to this we will be able to load specific data.
Code example:
$user_agent = $_SERVER['HTTP_USER_AGENT'];
if (strpos($user_agent, 'Windows') !== false) {
//PC, high resolution
//*note for phone is: Windows Phone
} elseif (strpos($user_agent, 'Mac') !== false) {
//PC, high resolution
} else {
//mobile, small resolution
//Android, iOS, Windows Phone, Blackberry OS, Symbian OS, Bada OS, Firefox OS, WebOS, Tizen OS, KaiOS, Sailfish OS, Ubuntu Touch, HarmonyOS, EMUI, OxygenOS, One UI, Magic UI, ColorOS, MiUI, OxygenOS, ZenUI, LG UX, FunTouch OS, Flyme OS, OxygenOS, Samsung One UI, Android One, Android Go, Android TV, Android Auto, Fuchsia OS.
}
Then, a great solution to complete the verification is to throw a cookie and check the data using PHP.
//JS:
function setCookieResolution() {
// Get screen resolution
if (!getCookieValue("screen_resolution")) {
var screenResolution = window.screen.width + "x" + window.screen.height;
// Create cookie with resolution info
document.cookie = "screen_resolution=" + screenResolution + ";path=/";
}
}
setCookieResolution();
//PHP:
if (isset($_COOKIE["screen_resolution"])) {
$currentValue = $_COOKIE["screen_resolution"];//example: 1920x1080
$parts = explode("x", $currentValue);
if(count($parts) == 2 && is_numeric($parts[0]) && is_numeric($parts[1])) {
$width = (int)$parts[0];
$height = (int)$parts[1];
} else {
// handle error
}
}
In PHP there is no standard way to get this information. However, it is possible if you are using a 3rd party solution. 51Degrees device detector for PHP has the properties you need:
$_51d['ScreenPixelsHeight']
$_51d['ScreenPixelsWidth']
Gives you Width and Height of user's screen in pixels. In order to use these properties you need to download the detector from sourceforge. Then you need to include the following 2 lines in your file/files where it's necessary to detect screen height and width:
<?php
require_once 'path/to/core/51Degrees.php';
require_once 'path/to/core/51Degrees_usage.php';
?>
Where path/to/core is path to 'Core' directory which you downloaded from sourceforge. Finally, to use the properties:
<?php
echo $_51d['ScreenPixelsHeight']; //Output screen height.
echo $_51d['ScreenPixelsWidth']; //Output screen width.
?>
Keep in mind these variables can contain 'Unknown' value some times, when the device could not be identified.
solution: make scalable web design ... ( our should i say proper web design) formating should be done client side and i did wish the info would be passed down to server but the info is still usefull ( how many object per rows kind of deal ) but still web design should be fluid thus each row elements should not be put into tables unless its an actual table ( and the data will scale to it's individual cells) if you use a div you can stack each elements next to each other and your window should "break" the row at the proper spot. ( just need proper css)
<script type="text/javascript">
if(screen.width <= 699){
<?php $screen = 'mobile';?>
}else{
<?php $screen = 'default';?>
}
</script>
<?php echo $screen; ?>