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Parallel processes in PHP
Additional PHP Material example from a Well House Consultants training course
More on Additional PHP Material [link]

This example is described in the following article(s):
   • Parallel processing in PHP - [link]

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This example references the following resources:

Source code: oursites.php Module: H999

/* If you need to run several tests that each take
a while (due, for example, to the slow respsonses of
remote servers) in your PHP page, but you don't
want to keep your visitor waiting, you can use popen
to start subsidiary tasks.  There might not be a "fork"
function in PHP, but this is a nice alternative */

$sites = array("http://www.wellho.net/index.html",

# Set off parallel contacts to each of 4 sites

for ($p=0$p<count($sites); $p++) {
$fh[$p] = popen("/usr/local/bin/php ".
"/home/wellho/public_html/demo/site_title ".

# And read back the results

for ($p=0$p<count($sites); $p++) {
$st fgets($fh[$p]);
$rs .=  "<a href=$sites[$p]>$sites[$p]</a>:".
$st<br />";

/* Here - as comments - is my site_title script:

$fcg = @file_get_contents($argv[1]);
$tv = ereg_replace('[[:blank:]]',' ',$got[1]);
print "$tv\n";


<title>Page title "snatcher"</title>
<h2>Demonstration script</h2>
Grabs titles from multiple sites in parallel<br /><br />
<?= $rs ?>
See <a href=http://www.wellho.net/mouth/1020_.html>here</a>
for an example of parallel processing in PHP<br />
Well House Consultants, 2007

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in PHP
 * PHP Programming
 * PHP Programming
 * Learning to program in PHP
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Additional PHP Material" training module. You'll find a description of the topic and some other closely related examples on the "Additional PHP Material" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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This web site is written and maintained by Well House Consultants.

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Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

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