How to update variable output automatically in PHP?

Question

I currently have a script that looks something like this:

<?php
$pattern = '/(?<=\=\s)([0-9]+)(?=\s\=)/';
$total = 0;
$matches;

$handle = @fopen("log.txt", "r");

if ($handle) {
    while (($buffer = fgets($handle, 4096)) !== false) {        
        if(preg_match($pattern, $buffer, $matches))
        {
            $total += intval($matches[0]);
        }       
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail\n";
    }
    fclose($handle);
}
echo $total;
?>

The thing is that the variable $total will update often with a brand new number. I want the number to automatically update on the page, without the user having to refresh. I think that I might need to use AJAX by the looks of it, but my AJAX is very weak. Can anybody help me? Thanks!

Dave · Accepted Answer · 2012-12-26 21:03:37Z

1

Quick and dirty:

<html lang="en">
    <head>
        <script type="text/javascript" src="http://www.google.com/jsapi"></script>
        <script type="text/javascript">
            google.load('jquery', '1.4.2'); 
            google.load('jqueryui', '1.8.8');
        </script>
        <script type="text/javascript">
            $(document).ready(function() {
                setInterval('get_counter()', 500);
            });
            function get_counter()
            {
                $('.counter').load('PATH_TO_YOUR_PHP_SCRIPT');
            }
        </script>
    </head>
    <body>
        <h1>Counter</h1>
        <div class="counter"></div>
    </body>
</html>

answered Dec 26, 2012 at 21:03

Dave

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Comments

Mike Brant · Accepted Answer · 2012-12-26 19:42:41Z

1

You would have to use AJAX or simply use a meta- or javascript-refresh. Of coruse those refreshes would reload the page, but could do so without user interaction.

answered Dec 26, 2012 at 19:42

Mike Brant

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2 Comments

user1930449 Over a year ago

Ahh I see. Can you post an example of an AJAX sxript that could do this?

Mike Brant Over a year ago

@user1930449 It would be best if you attempted the implementation and then can back and opened a question on SO if you run into any problems. So is not really a "write my code for me" site. There are hundreds of thousands of samples of using AJAX out there available for you to search from.

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