Php Partial Caching

Question

I want caching some php files partially. for example

<?
echo "<h1>",$anyPerdefinedVarible,"</h1>";
echo "time at linux is: ";
// satrt not been catched section
echo date();
//end of partial cach
echo "<div>goodbye $footerVar</div>";
?>

So cached page should be like as (cached.php)

<h1>This section is fixed today</h1>
<? echo date(); ?>
<div>goodbye please visit todays suggested website</div>

It may be done with templating but I want it directly. Because I want alternative solution.

Generating these lines will be faster, than fetching 2 keys from cache storage. Try to cache data from database, don't waste your time to output, it's template engine's business. — user680786
– user680786, Commented Apr 1, 2012 at 22:26
This code is only for example. Real codes are so complex and requires some sql queries. I try show my problem very clear. I want to know PHP caching mechanism. — Huseyin
– Huseyin, Commented Apr 1, 2012 at 22:32
Well, it's not only about PHP, it's common. Again: cache data, fetched from DB, don't cache output. And try to use Twig for templates, it will open your understanding of separation data from representation. — user680786
– user680786, Commented Apr 1, 2012 at 22:41
@OZ_ it is common case for all programming languages, but I know PHP lang better than others. I want use it for flexible templates. I need template that contains multiple parts that was created at different dates. — Huseyin
– Huseyin, Commented Apr 1, 2012 at 22:48

ArendE · Accepted Answer · 2012-04-02 00:59:52Z

4

Look at php's ob_start(), it can buffer all output and save this. http://php.net/manual/en/function.ob-start.php

Addition: Look at http://www.php.net/manual/en/function.ob-start.php#106275 for the function you want :) Edit: Here a even simpeler version: http://www.php.net/manual/en/function.ob-start.php#88212 :)

Here some simple, but effective, solution:

template.php

<?php
    echo '<p>Now is: <?php echo date("l, j F Y, H:i:s"); ?> and the weather is <strong><?php echo $weather; ?></strong></p>';
    echo "<p>Template is: " . date("l, j F Y, H:i:s") . "</p>";
    sleep(2); // wait for 2 seconds, as you can tell the difference then :-)
?>

actualpage.php

<?php    
    function get_include_contents($filename) {
        if (is_file($filename)) {
            ob_start();
            include $filename;
            return ob_get_clean();
        }
        return false;
    }

    // Variables
    $weather = "fine";

    // Evaluate the template (do NOT use user input in the template, look at php manual why)
    eval("?>" . get_include_contents("template.php"));
?>

You could save the contents of template.php or actualpage.php with http://php.net/manual/en/function.file-put-contents.php to some file, like cached.php. Then you can let the actualpage.php check the date of cached.php and if too old, let it make a new one or if young enough simply echo actualpage.php or re-evaluate template.php without rebuilding the template.

After comments, here to cache the template:

<?php    
    function get_include_contents($filename) {
        if (is_file($filename)) {
            ob_start();
            include $filename;
            return ob_get_clean();
        }
        return false;
    }

    file_put_contents("cachedir/cache.php", get_include_contents("template.php"));

?>

To run this you can run the cached file directly, or you can include this on an other page. Like:

<?php
    // Variables
    $weather = "fine";

    include("cachedir/cache.php");
?>

edited Apr 2, 2012 at 0:59

answered Apr 1, 2012 at 22:34

ArendE

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9 Comments

Huseyin Over a year ago

it is usefull, but it do cach all parts of page. I want cach some parts of php outputs not all of them.

ArendE Over a year ago

You could pass it to a function, include/require it - it's flexible. Of course, you can pass your contents yourself to a cached file, look at fopen() and fwrite() function then - you'll still have to pass the content to them. You can use filemtime() to check the time/date of the file and simply replace it, if it becomes out of date.

Huseyin Over a year ago

I want use it for flexible templates. I need template that contains multiple parts that was created at different dates. Therefor I need any function that ignore specified php codes section from caching.

ArendE Over a year ago

So make that function? You have all the information needed for it, if not please do say. Instead of echo "myVar"; you can make a function echoBuffer and so use echoBuffer("myVar"); for contents that must be buffered and make a function that returns your needs. (in this case is should return a (buffered) string "myVar". You can use them both; like echo, date, other functions etc.

ArendE Over a year ago

You could also simply echo '<?php' . date() . '?>'; to your new template file, maybe that is what your looking for?

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