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    <p>If you need to send it back to the browser, you should probably investigate using an AJAX call on a setInterval timer and a PHP script that checks for the files existence. You can do this in two ways:</p> <ol> <li><p><code>flush()</code> html back to the browser that includes Javascipt that starts a polling process using AJAX for the browser poll-side and your PHP script with an AJAX function to process the poll. </p></li> <li><p>If <code>flush()</code> doesn't work, then you should return the HTML of your PHP script BEFORE setting off your Java process. In that code put two AJAX calls. One that starts the actual Java process and one that starts a polling service looking for the file.</p></li> </ol> <p>Long running scripts may timeout the browser before you can get a response from your Java application, which is why you'll likely need the browser to work asynchronously from your Java process. </p> <p>On the other hand, if this is a pure PHP script running or the Java process is less than a typical browser timeout, you can just use something like:</p> <pre><code>$nofileexists = true; while($nofilexists) { // loop until your file is there $nofileexists = checkFileExists(); //check to see if your file is there sleep(5); //sleeps for X seconds, in this case 5 before running the loop again } </code></pre> <p>You didn't mention if this would be a high traffic call (for lots of public users) or a reporting type application. If high traffic, I would recommend the AJAX route, but if low traffic, then the code above.</p>
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    1. POHow to keep checking for a file until it exists, then provide a link to it
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