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PHP/cURL download progress monitoring
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| <?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(); | |
| ?> |
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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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.