I'm settled at a friends house in Ottawa for a little while so the daily 
summaries are back again.  Welcome to everyone who has joined this list 
in the last few weeks.

I apologise for the database problems that e-gineer has been 
experiencing this week.  Cheap web hosts are great until you need 
technical support.  I'm in the process of moving e-gineer to a dedicated 
machine so things will be a lot more reliable.

Cheers,

Nathan


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How do I set up PHP so the mail() function works with qmail?
Why won't the mail() function work with qmail?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/618
------------------------------------------------------------
Sheamus Nulty

Try making qmail's "sendmail" wrapper available to MUAs and leave your 
php3.ini as it was for sendmail.  Here are sample unix commands:

    # ln -s /var/qmail/bin/sendmail /usr/lib/sendmail
    # ln -s /var/qmail/bin/sendmail /usr/sbin/sendmail


------------------------------------------------------------
How can I work out what version of PHP I'm using?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/621
------------------------------------------------------------
Richard Lynch

Create a page with just this line:

    <?php phpinfo() ?>

The resulting output should tell you what version of PHP is running.


------------------------------------------------------------
How can I get the URL of the current page that the script is processing?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/622
------------------------------------------------------------
Rasmus Lerdorf

The variable:

    $PHP_SELF

stores the URL of the current page being served.


------------------------------------------------------------
How can I execute multiple unix commands with one system call?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/623
------------------------------------------------------------
John Millaway, Richard Lynch, Teodor Cimpoesu

Try this:

    system("cd /etc ; ls -l");

or this:

    chdir("/etc");
    system("ls -l");

or this:

    system("cd /etc \n ls -l");

or these bash variations:

    system("ls -l /etc");

    system("cd /etc && ls -l");


** OTHER RANDOMLY SELECTED PHPKB ENTRIES **


------------------------------------------------------------
What sort of array does mysql_fetch_array return?
Why does each() return every column twice after a query?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/170
------------------------------------------------------------

Read the manual:

  http://www.php.net/manual/function.mysql-fetch-array.php3

The optional second argument result_typ in mysql_fetch_array() is a
constant and can take the following values: MYSQL_ASSOC, MYSQL_NUM, and
MYSQL_BOTH. 

MYSQL_ASSOC will return an array that is keyed by the names of the
columms.  eg: array(col1=>val1, col2=>val2).

MYSQL_NUM will return an array that is keyed by order in which the
columsn are returned.  eg: array(0=>val1, 1=>val2).

MYSQL_BOTH gives you the best of both worlds.  eg: array(0=>val1,
col1=>val1, 1=>val2, col2=>val2).

Be careful when using MYSQL_BOTH.  If you try to use the each() function
in a while loop you will get all of the values back in turn.

http://www.php.net/manual/function.each.php3


------------------------------------------------------------
How do I stop PHP pages from being stored in the browser's cache?
What is the Cache-control header used for?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/281
------------------------------------------------------------

header("Cache-control: no-cache");
header("Expires: " . gmdate("D, d M Y H:i:s") . " GMT");

The first header is for HTTP/1.1 compatible proxies/clients.  The 
second is for HTTP/1.0.  The Cache-control header is the HTTP/1.1
equivilant of the HTTP/1.0 header Pragma: no-cache.

It causes the client (most specifically, proxies) to not cache the
document.  You would use this on something like a realtime banking
session or most any page where the user has been authenticated.

Cache-Control: also adds more features than Pragma. no-store, max-age=?
max-stale=?, min-fresh=?, and only-if-cached.

For more information see the HTTP/1.1 specification at:

    http://www.w3.org/Protocols/Specs.html


------------------------------------------------------------
How can I redirect different browsers to different pages?
How can I show a different page to each different browser?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/556
------------------------------------------------------------

I guess you could use $HTTP_USER_AGENT to get the browser and then:

    if($browser == 'netscape') {
        Header("Location: http://the.server.com/netscape.html");
    } elseif ($browser == 'ie'{
        Header("Location: http://the.server.com/explorer.html");
    } else {
        Header("Location: http://the.server.com/default.html");
    }

I know netscape.com has a pretty uptodate javascript on their server 
that you might have a look at to see exactly how the matching should be 
done.


------------------------------------------------------------
Why does $HTTP_REFERER return an empty string?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/32
------------------------------------------------------------

Are you trying to use HTTP_REFERER inside a function? If so, you'll need
to add a 'global $HTTP_REFERER;' line to your function to get at the
variable from the global scope.

In order for $HTTP_REFERER to work, there needs to be a HTTP_REFERER
header. This header does not exist if someone types in the URL directly
(ie: does not follow a link to the page).  It only exists when someone
clicks on a link from another page.



------------------------------------------------------------
I have added a function to file.c and recompiled.  Why doesn't it exist 
in PHP?
http://e-gineer.com/e-gineer/phpkb/view.phtml/qid/253
------------------------------------------------------------

Did you add it to the function list at the top of the file? It has to
make itself known to php or it is just text in a file.