Has anyone found a solution, how to display a message in the browser every second using PHP?
Until now, I've always used the following code, which worked fine on my server running IIS 6:
<html>
<body>
<?php
for ($counter = 0; $counter <= 10; $counter++) {
echo "Message after " . $counter . " second(s)<br>";
ob_flush();
flush();
sleep(1);
}
?>
</body>
</html>
I've seen several posts that ob_flush no longer works with the newer IIS versions.
I use IIS on Windows 10.
In some posts I read to add responseBufferLimit="0" into the section PHP_via_FastCGI of the file C:\Windows\System32\inetsrv\config\applicationHost.config.
But in this file I've only the following section about fastCgi so I've no idea how to add responseBufferLimit="0" into this section:
<fastCgi>
<application fullPath="C:\Program Files\PHP\php-cgi.exe" />
</fastCgi>
Any help is very appreciated.
I've done some tests. It's still a workaround, but a bit smarter and I think as long as there's no better solution, you can live with it.
You just have to add echo str_repeat(" ", 7500000); at the very beginning of your code and ob_flush() and flush() will do what they're supposed to do (also with the new IIS versions):
<html>
<body>
<?php
echo str_repeat(" ", 7500000);
for ($counter = 0; $counter <= 10; $counter++) {
echo "Message after " . $counter . " second(s)<br>";
ob_flush();
flush();
sleep(1);
}
?>
</body>
</html>
The following code is definitely not a smart and good solution, but maybe you can use it as a workaround until someone here shows us the smart solution, which I'm also very interested in.
<html>
<body>
<?php
for ($counter = 0; $counter <= 10; $counter++) {
echo "Message after " . $counter . " second(s)";
echo str_repeat(" ", 10000000) . "<br>";
sleep(1);
}
?>
</body>
</html>
Related
Description:
I have the follwoing code:
if(isset($riskTriggerFlag) && $riskTriggerFlag==1) // if risk_mitigator process reads and offer weight is maintained based on offer mentioned.
{
echo "Risk Weight: ".$risk_weight ."\n";
$randNo = rand(1,100);
echo "Random Weight: ". $randNo ."\n";
if($randNo < intval(100 - $risk_weight))
{
$flagThrowPostback = 1;
}
}
As you can see,I am putting \n in the text,but still the message in getting printed in this matter:
Risk Weight: 20 Random Weight: 20
What am I doing wrong?
Note:
I can't use br tag or nl2br() since the total page is just a php page, and I don't want to add any html tags.
output on broswer is coming like this:
<html>
<head></head>
<body>Multiple row Risk Weight: 20 Random Weight: 20 </body>
</html>
I think better way is to check whether php file is executed from CLI or browser. In case it is from browser then use else newline.
$newline = "<br />";
if (PHP_SAPI === 'cli')
{
// ...
$newline = "\n";
}
if(isset($riskTriggerFlag) && $riskTriggerFlag==1) // if risk_mitigator process reads and offer weight is maintained based on offer mentioned.
{
echo "Risk Weight: ".$risk_weight . $newline;
$randNo = rand(1,100);
echo "Random Weight: ". $randNo . $newline;
if($randNo < intval(100 - $risk_weight))
{
$flagThrowPostback = 1;
}
}
I am just a amateur php programmer!
I have a specific requirement.
I want to control php output behaviour in my script.
What i want is this thing
myscript.php
echo "phase 1";// (output to browser immediately)
echo "Proceeding further....";
sleep (10);
echo "phase 2";// (output to the browser immediately)
sleep(10);
echo "phase end";
But what happens is all the output of echo gets dump after 20 second i mean complete output not sequencewise...
How can i output it in sequence wise.. i do not know what it is called ! Please also show a example if possible it helps in understanding
You might wanna take a look at some Websocket like Rachet. For a simpler version, you just use a combination of Javascript/Ajax and PHP.
EDIT: The simplest way; the jQuery/PHP way
As requested in the comments, this is a very simple, insecure way of achieving asynchronous server work/feedback.
Server-side
//doTheWork.php
switch($_POST['step'])
{
case 1:
$output = shell_exec('cat text.txt'); //Do whatever you need to do here
break;
case 2:
$output = shell_exec('ls');
break;
default:
$output = "No or invalid step declared";
}
echo $output;
Client-side
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Testing live feedback</title>
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script> <!-- Include your local version of jQuery -->
<script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
</head>
<body>
<div id="console">
<h2>Output from server</h2>
<div id="console_output">
</div>
</div>
<script type="text/javascript">
var totalSteps = 5;
var currentStep = 0;
var url_to_server = "http://localhost/doTheWork.php";
function executeAndOutputData()
{
currentStep++;
if(currentStep >= totalSteps) return;
$.post(url_to_server, {step:currentStep}, function(response){
$("#console_output").append(response+"<br>");
executeAndOutputData();
});
}
executeAndOutputData();
</script>
</body>
</html>
Yes you can natively with PHP using flush functions.
Example with your code :
<?
echo "phase 1";// (output to browser immediately)
echo "Proceeding further....";
flush();
ob_implicit_flush(true);
ob_flush();
sleep (10);
echo "phase 2";// (output to the browser immediately)
sleep(10);
echo "phase end";
?>
edit : But, this is just to answer you. A such code is certainly fully useless and must be improved to remove sleep calls.
I am satisfied with Dencker answer but still i now know a simpler way by using only PHP.
Derived from http://www.codeproject.com/Tips/680085/Real-time-Updating-of-PHP-Output
// Turn off output buffering
ini_set('output_buffering', 'off');
// Turn off PHP output compression
ini_set('zlib.output_compression', false);
//Flush (send) the output buffer and turn off output buffering
while (#ob_end_flush());
// Implicitly flush the buffer(s)
ini_set('implicit_flush', true);
ob_implicit_flush(true);
echo "Start<br />";
echo str_pad("",1024," ");
echo "<br />";
ob_flush();
flush();
sleep(5);
echo "Program Output";
ob_flush();
flush();
And it does work without any server config and it is well suited for my need (temp). But i will be looking at the suggestion posted here.
So I have a simple html page that looks like this.
<html>
<head>
<?php include("scripts/header.php"); ?>
<title>Directory</title>
</head>
<body>
<?php include("scripts/navbar.php"); ?>
<div id="phd">
<span id="ph">DIRECTORY</span>
<div id="dir">
<?php include("scripts/autodir.php"); ?>
</div>
</div>
<!--Footer Below-->
<?php include("scripts/footer.php"); ?>
<!--End Footer-->
</body>
</html>
Now, the problem is, when I load the page, it's all sorts of messed up. Viewing the page source code reveals that everything after <div id="dir"> is COMPLETELY GONE. The file ends there. There is no included script, no </div>'s, footer, or even </body>, </html>. But it's not spitting out any errors whatsoever. Just erasing the document from the include onward without any reason myself or my buddies can figure out. None of us have ever experienced this kind of strange behavior.
The script being called in question is a script that will fetch picture files from the server (that I've uploaded, not users) and spit out links to the appropriate page in the archive automatically upon page load because having to edit the Directory page every time I upload a new image is a real hassle.
The code in question is below:
<?php
//Define how many pages in each chapter.
//And define all the chapters like this.
//const CHAPTER_1 = 13; etc.
const CHAPTER_1 = 2; //2 for test purposes only.
//+-------------------------------------------------------+//
//| DON'T EDIT BELOW THIS LINE!!! |//
//+-------------------------------------------------------+//
//Defining this function for later. Thanks to an anon on php.net for this!
//This will allow me to get the constants with the $prefix prefix. In this
//case all the chapters will be defined with "CHAPTER_x" so using the prefix
//'CHAPTER' in the function will return all the chapter constants ONLY.
function returnConstants ($prefix) {
foreach (get_defined_constants() as $key=>$value) {
if (substr($key,0,strlen($prefix))==$prefix) {
$dump[$key] = $value;
}
}
if(empty($dump)) {
return "Error: No Constants found with prefix '" . $prefix . "'";
}
else {
return $dump;
}
}
//---------------------------------------------------------//
$archiveDir = "public_html/archive";
$files = array_diff(scandir($archiveDir), array("..", "."));
//This SHOULD populate the array in order, for example:
//$files[0]='20131125.png', $files[1]='20131126.png', etc.
//---------------------------------------------------------//
$pages = array();
foreach ($files as $file) {
//This parses through the files and takes only .png files to put in $pages.
$parts = pathinfo($file);
if ($parts['extension'] == "png") {
$pages[] = $file;
}
unset($parts);
}
//Now that we have our pages, let's assign the links to them.
$totalPages = count($pages);
$pageNums = array();
foreach ($pages as $page) {
//This will be used to populate the page numbers for the links.
//e.g. "<a href='archive.php?p=$pageNum'></a>"
for($i=1; $i<=$totalPages; $i++) {
$pageNums[] = $i;
}
//This SHOULD set the $pageNum array to be something like:
//$pageNum[0] = 1, $pageNum[1] = 2, etc.
}
$linkText = array();
$archiveLinks = array();
foreach ($pageNums as $pageNum) {
//This is going to cycle through each page number and
//check how to display them.
if ($totalPages < 10) {
$linkText[] = $pageNum;
}
elseif ($totalPages < 100) {
$linkText[] = "0" . $pageNum;
}
else {
$linkText[] = "00" . $pageNum;
}
}
//So, now we have the page numbers and the link text.
//Let's plug everything into a link array.
for ($i=0; $i<$totalPages; $i++) {
$archiveLinks[] = "<a href='archive.php?p=" . $pageNums[$i] . "'>" . $linkText[$i] . " " . "</a>";
//Should output: <a href= 'archive.php?p=1'>01 </a>
//as an example, of course.
}
//And now for the fun part. Let's take the links and display them.
//Making sure to automatically assign the pages to their respective chapters!
//I've tested the below using given values (instead of fetching stuff)
//and it worked fine. So I doubt this is causing it, but I kept it just in case.
$rawChapters = returnConstants('CHAPTER');
$chapters = array_values($rawChapters);
$totalChapters = count($chapters);
$chapterTitles = array();
for ($i=1; $i<=$totalChapters; $i++) {
$chapterTitles[] = "<h4>Chapter " . $i . ":</h4><p>";
echo $chapterTitles[($i-1)];
for ($j=1; $j<=$chapters[($i-1)]; $j++) {
echo array_shift($archiveLinks[($j-1)]);
}
echo "</p>"; //added to test if this was causing the deletion
}
?>
What is causing the remainder of the document to vanish like that? EDIT: Two silly syntax errors were causing this, and have been fixed in the above code! However, the links aren't being displayed at all? Please note that I am pretty new to php and I do not expect my code to be the most efficient (I just want the darn thing to work!).
Addendum: if you deem to rewrite the code (instead of simply fixing error(s)) to be the preferred course of action, please do explain what the code is doing, as I do not like using code I do not understand. Thanks!
Without having access to any of the rest of the code or data-structures I can see 2 syntax errors...
Line 45:
foreach ($pages = $page) {
Should be:
foreach ($pages as $page) {
Line 88:
echo array_shift($archiveLinks[($j-1)];
Is missing a bracket:
echo array_shift($archiveLinks[($j-1)]);
Important...
In order to ensure that you can find these kinds of errors yourself, you need to ensure that the error reporting is switched on to a level that means these get shown to you, or learn where your logs are and how to read them.
See the documentation on php.net here:
http://php.net/manual/en/function.error-reporting.php
IMO all development servers should have the highest level of error reporting switched on by default so that you never miss an error, warning or notice. It just makes your job a whole lot easier.
Documentation on setting up at runtime can be found here:
http://www.php.net/manual/en/errorfunc.configuration.php#ini.display-errors
There is an error in scripts/autodir.php this file. Everything up to that point works fine, so this is where the problem starts.
Also you mostlikely have errors hidden as Chen Asraf mentioned, so turn on the errors:
error_reporting(E_ALL);
ini_set('display_errors', '1');
Just put that at the top of the php file.
My entire PHP page only displays as text and no PHP code is executed. It's weird because when I test it using <? phpinfo(); ?> in a test.php file, I get a successful test and it works on my Apache server. However when I attempt to do anything else. It only shows as text.
Edit: Here is the link to the code. I couldn't figure out how to post it here. Pastebin
<?php
// create short variable names
$tireqty = $_POST['tireqty'];
$oilqty = $_POST['oilqty'];
$sparkqty = $_POST['sparkqty'];
$find = $_POST['find'];
?>
<html>
<head>
<title>Bob's Auto Parts - Order Results</title>
</head>
<body>
<h1>Bob's Auto Parts</h1>
<h2>Order Results</h2>
<?php
echo "<p>Order processed at ".date('H:i, jS F Y')."</p>";
echo "<p>Your order is as follows: </p>";
$totalqty = 0;
$totalqty = $tireqty + $oilqty + $sparkqty;
echo "Items ordered: ".$totalqty."<br />";
if ($totalqty == 0) {
echo "You did not order anything on the previous page!<br />";
} else {
if ($tireqty > 0) {
echo $tireqty." tires<br />";
}
if ($oilqty > 0) {
echo $oilqty." bottles of oil<br />";
}
if ($sparkqty > 0) {
echo $sparkqty." spark plugs<br />";
}
}
$totalamount = 0.00;
define('TIREPRICE', 100);
define('OILPRICE', 10);
define('SPARKPRICE', 4);
$totalamount = $tireqty * TIREPRICE
+ $oilqty * OILPRICE
+ $sparkqty * SPARKPRICE;
echo "Subtotal: $".number_format($totalamount,2)."<br />";
$taxrate = 0.10; // local sales tax is 10%
$totalamount = $totalamount * (1 + $taxrate);
echo "Total including tax: $".number_format($totalamount,2)."<br />";
if($find == "a") {
echo "<p>Regular customer.</p>";
} elseif($find == "b") {
echo "<p>Customer referred by TV advert.</p>";
} elseif($find == "c") {
echo "<p>Customer referred by phone directory.</p>";
} elseif($find == "d") {
echo "<p>Customer referred by word of mouth.</p>";
} else {
echo "<p>We do not know how this customer found us.</p>";
}
?>
</body>
</html>
I am willing to bet 10$ that test.php uses <?php, and the changed code uses <?, while the server does not understand it as an opening tag since short_open_tags is off in php.ini.
A lot of books use <? for open tags, while most servers only support the long version (<?php). If that's the case, then changing all the simple <? to <?php will do the trick.
PHP code is only exposed in 1 case: When PHP interpreter does not identify it as PHP code. That can be caused by only 2 problems:
Wrong configuration of Apache (or other http server) which doesn't handle php files at all.
Wrong open tags in PHP files, so PHP doesn't know when code begins.
If the file is a *.php, if Apache is turned on serving *.php files through PHP interpreter, if standard open tags are used or PHP is configured to use other types of used tags, and if you're accessing this PHP file through the browser, in no circumstances would PHP expose this code.
I am using ob_start()/ob_flush() to, hopefully, give me some progress during a long import operation.
Here is a simple outline of what I'm doing:
<?php
ob_start ();
echo "Connecting to download Inventory file.<br>";
$conn = ftp_connect($ftp_site) or die("Could not connect");
echo "Logging into site download Inventory file.<br>";
ftp_login($conn,$ftp_username,$ftp_password) or die("Bad login credentials for ". $ftp_site);
echo "Changing directory on download Inventory file.<br>";
ftp_chdir($conn,"INV") or die("could not change directory to INV");
// connection, local, remote, type, resume
$localname = "INV"."_".date("m")."_".date('d').".csv";
echo "Downloading Inventory file to:".$localname."<br>";
ob_flush();
flush();
sleep(5);
if (ftp_get($conn,$localname,"INV.csv",FTP_ASCII))
{
echo "New Inventory File Downloaded<br>";
$datapath = $localname;
ftp_close($conn);
} else {
ftp_close($conn);
die("There was a problem downloading the Inventory file.");
}
ob_flush();
flush();
sleep(5);
$csvfile = fopen($datapath, "r"); // open csv file
$x = 1;
// skip the header line
$line = fgetcsv($csvfile);
$y = (feof($csvfile) ? 2 : 5);
while ((!$debug) ? (!feof($csvfile)) : $x <= $y) {
$x++;
$line = fgetcsv($csvfile);
// do a lot of import stuff here with $line
ob_flush();
flush();
sleep(1);
}
fclose($csvfile); // important: close the file
ob_end_clean();
However, nothing is being output to the screen at all.
I know the data file is getting downloaded because I watch the directory where it is being placed.
I also know that the import is happening, meaning that it is in the while loop, because I can monitor the DB and records are being inserted.
Any ideas as to why I am not getting output to the screen?
You also need to check the PHP settings
some installs default to 4096, some default to off
output_buffering = Off
output_buffering = 4096
agreed with George but do check the above settings
Make sure that your output buffering doesn't start automatically. Run:
print ob_get_level ();
before ob_start (); if will will see something else then 0 you've got the answer.
Hey man I was also got stuck in this problem
and finally got the correct solution
here it is for you
you have to add content type for your page
you can do that by two ways
1. using html tag
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Ex.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Wp Migration</title>
</head>
<body>
<?php
for($i=0;$i<70;$i++)
{
echo 'printing...<br>';
ob_flush();
flush();
sleep(3);
}
?>
</body>
</html>
using php header function
<?php header( 'Content-type: text/html; charset=utf-8' ); ?>
Ex.
<?php
header( 'Content-type: text/html; charset=utf-8' );
for($i=0;$i<70;$i++)
{
echo 'printing...<br>';
ob_flush();
flush();
sleep(3);
}
?>
All the best
Ob_end_clean() discards the contents of the current output buffer and turns off the buffering.
You should use ob_end_flush() instead.
Add this line
header("X-Accel-Buffering: no");
worked for me.
You can edit it with the .htaccess file
To disable output buffering, modify the line as follows:
php_value output_buffering Off
php_value output_buffering 4096
worked for me. Thank you!
Check this site: Click Here
It's possible that your webserver is doing its own buffering. Probably with something like mod_gzip.
Here is some very simple test code:
<?php
echo 'starting...<br/>';
for($i = 0; $i < 5; $i++) {
print "$i<br/>";
flush();
sleep(2);
}
print 'DONE!<br/>';
If it takes 10 seconds for that page to load, rather than seeing a new line every 2 seconds, then it means that it is being cached by your webserver. For what you are trying to do, there is no need to use ob_start and ob_flush. Just call flush whenever you want to force the content to the browser. However, like I mentioned, if the webserver is waiting for the content to complete before sending, then that won't do anything for you.
Edit: Another possibility is that you're viewing the page from behind a corporate or ISP proxy/firewall that waits for the whole page before serving it (so that it can scan it to see if it looks like pornography, for example).