stuudmuffin/curl_progress.php

## curl_progress.php
<?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();

?>
	<?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();

	?>