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POAjax progress with PHP session
 

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    <p>I have an app that processes images and use jQuery to display progress to the user.<br /> I done this with writing to a textfile each time and image is processed and than read this status with a setInterval.</p> <p>Because no images are actually written in the processing (I do it in PHP's memory) I thought a log.txt would be a solution, but I am not sure about all the fopen and fread's. Is this prone to issues?</p> <p>I tried also with PHP sessions, but can't seem to get it to work, I don't get why..</p> <p>HTML:</p> <pre><code>&lt;a class="download" href="#"&gt;request download&lt;/a&gt; &lt;p class="message"&gt;&lt;/p&gt; </code></pre> <p>JS:</p> <pre><code>$('a.download').click(function() { var queryData = {images : ["001.jpg", "002.jpg", "003.jpg"]}; $("p.message").html("initializing..."); var progressCheck = function() { $.get("dynamic-session-progress.php", function(data) { $("p.message").html(data); } ); }; $.post('dynamic-session-process.php', queryData, function(intvalId) { return function(data) { $("p.message").html(data); clearInterval(intvalId); } } (setInterval(progressCheck, 1000)) ); return false; }); </code></pre> <p>process.php:</p> <pre><code>// session_start(); $arr = $_POST['images']; $arr_cnt = count($arr); $filename = "log.txt"; for ($i = 1; $i &lt;= $arr_cnt; $i++) { $content = "processing $val ($i/$arr_cnt)"; $handle = fopen($filename, 'w'); fwrite($handle, $content); fclose($handle); // $_SESSION['counter'] = $content; sleep(3); // to mimic image processing } echo "&lt;a href='#'&gt;download zip&lt;/a&gt;"; </code></pre> <p>progress.php:</p> <pre><code>// session_start(); $filename = "log.txt"; $handle = fopen($filename, "r"); $contents = fread($handle, filesize($filename)); fclose($handle); echo $contents; // echo $_SESSION['counter']; </code></pre>
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    1. COI don't know the exact solution to your problem but as a tip - in your process.php file you should move your fopen before you actually start the loop. You can fwrite() multiple times so long as you don't close the file (move the fclose() outside the end of the loop). You are opening the file each time you run through the loop.
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      1. USJarrod Nettles
    2. COof course! Thanks Jarrod for the tip.
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