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    <p>This is how I do it (you'll probably want to add some sort of validation in the PHP to prevent random uploading):</p> <p>JS:</p> <pre><code>function saveImage(){ var xmlhttp; xmlhttp=((window.XMLHttpRequest)?new XMLHttpRequest():new ActiveXObject("Microsoft.XMLHTTP")); xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { //do something with the response } } xmlhttp.open("POST","myImageSavingScript.php",true); var oldCanvas = document.getElementById('line1').toDataURL("image/png"); var img = new Image(); img.src = oldCanvas; xmlhttp.setRequestHeader("Content-type", "application/upload") xmlhttp.send(oldCanvas); } </code></pre> <p>PHP:</p> <pre><code>&lt;?php $im = imagecreatefrompng($GLOBALS["HTTP_RAW_POST_DATA"]); imagepng($im, 'filename.png'); ?&gt; </code></pre> <p>And this is a variation if you need to pass other parameters along with it:</p> <p>JS (just the mod):</p> <pre><code>var oldCanvas = document.getElementById('line1').toDataURL("image/png"); var img = new Image(); img.src = oldCanvas; var params=oldCanvas+"&amp;someOtherParameter=parameterValue"; xmlhttp.setRequestHeader("Content-type", "application/upload") xmlhttp.setRequestHeader("Content-length", params.length); xmlhttp.setRequestHeader("Connection", "close"); xmlhttp.send(params); </code></pre> <p>PHP:</p> <pre><code>&lt;?php $params=explode('&amp;',$GLOBALS["HTTP_RAW_POST_DATA"]); $val=split("=",$params[1]); $someOtherParam=urldecode($val[1]); $imgsrc=str_replace(' ','+',$params[0]); $im = imagecreatefrompng($imgsrc); imagepng($im, 'filename.png'); ?&gt; </code></pre>
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    1. POHTML5: saving the chart as an image on the server
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    1. COThank you very much, it works very well! PNG are generated perfectly. My further problem is that unfortunately it doesn't is possible to do it automatically by a cronjob. But i'm going to look around for some good tip. Tnx again!
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      1. USmattew
    2. COUnfortunately i found a big problem: i want to generate the image every day by a cron command and i can't becouse it seems that scripts are not executed. I tried to call the file with Lynx but the image isn't created. How cn i do? The problem is really big. :/
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    3. COI really don't know, but maybe if the cron job is to do something like 'file_get_contents' of this page, might it fire all of the required ajax, etc? Sorry, just a shot in the dark.
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