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@stuudmuffin
Forked from bdunogier/curl_progress.php
Last active May 11, 2024 20:21
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PHP/cURL download progress monitoring
<?php
//If output buffer flushing does not work, web-search for reasons your php/webserver setup may need to be adjusted
header('X-Accel-Buffering: no');
if (ob_get_level() == 0) ob_start();
//create javascript progress bar
echo "<html>
<head>
<script type='text/javascript'>
function updateProgress(perc) {
document.getElementById('info').innerHTML = perc + '%';
document.getElementById('prog').value = perc;
}
</script>
</head>
<body>
<p>Lets see some progress</p>
<progress id='prog' value='0' max='100.0'></progress> <span id='info'>0%</span>
";
//flush the progress bar
ob_flush();
flush();
//Callback Function for later
function progressCallback( $resource, $download_size, $downloaded_size, $upload_size, $uploaded_size ) {
static $previousProgress = 0;
if ( $download_size != 0 ) {
$progress = round( $downloaded_size * 100 / $download_size );
if ( $progress > $previousProgress ) {
$previousProgress = $progress;
//update javacsript progress bar to show download progress
echo "<script>updateProgress('$progress');</script>";
ob_flush();
flush();
}
}
}
//Start the curl
$targetFile = fopen( 'testfile.iso', 'w' );
$ch = curl_init( 'https://ftp.free.org/mirrors/releases.ubuntu.com/releases/20.04/ubuntu-20.04.3-live-server-amd64.iso' );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt( $ch, CURLOPT_NOPROGRESS, false );
curl_setopt( $ch, CURLOPT_PROGRESSFUNCTION, 'progressCallback' );
curl_setopt( $ch, CURLOPT_FILE, $targetFile );
curl_exec( $ch );
fclose( $targetFile );
//if we get here, the download has completed
echo "<script>document.getElementById('info').innerHTML = 'Done';</script>";
//flush just to be sure
ob_flush();
flush();
?>
@stuudmuffin
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stuudmuffin commented Oct 5, 2021

How can you do this if the curl is executing via ajax ?

Curl in this sense is a server-side process, and is not ajax. The server is downloading the file, not the client web browser. In the typical use of php-curl, it will be called before the page is rendered and has nothing to do with the client's capabilities. In our case, we're force flushing the buffer to output the page to the client, before it's been fully rendered, or before the file is 100% downloaded. This is what allows us to send progress updates to the client on how far along the server side download is.

@shoyebsheikh
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I get your point, ob statements wont work after the DOM is fully rendered.
I am doing this whole process in ajax i.e my curl is executing in ajax.
I am looking for a workaround to get it working like this example, any suggestions ?

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