Rui Miguel Feio

How to validate an email address format

2nd July 2009 Rui Miguel Feio

There are several ways of validating an email address format. Normally, I do it the following way: 1. I first define the regular expression for the email format: define (“FORMAT”,”^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$”); 2. To validate the email address provided is correct: if ( !eregi (FORMAT, $email)) echo “The email provided has an […]

PHP security considerations

1st July 2009 Rui Miguel Feio

When developing a script wether if it’s in PHP or any other language you should always consider the security aspect. I’m sure the last thing you want is to get your script (and ultimately your data) hacked. To make sure this does not happen there are a few steps you […]

How to identify a MySQL query problem

1st July 2009 Rui Miguel Feio

Sometimes you happen to have a problem with one of your MySQL queries and you simply can’t seem to understand why. Well, one thing that helps is to use the mysql_error() function. This function returns the message of the MySQL error you’re getting. Example: $action = “INSERT INTO table (name, […]

PHP Session not being passed from a web site to WordPress

30th June 2009 Rui Miguel Feio

Recently I had this case where a PHP session ($_SESSION) was not being passed from a web site to WordPress. Basically, WordPress was installed and configured to be part of a web site and there was the need to use Sessions to control the login/logout process of the site. Although […]

Update Linklist dynamically

29th June 2009 Rui Miguel Feio

Some people dread the idea of having to update the Linklist dynamically but in fact it’s a very simple process: Update the PROGxx member that your system uses from PARMLIB: Add/remove libraries as required Change the LNKLSTnn reference to LNKLSTnn+1 Issue the following MVS commands: SETPROG LNKLST,UNALLOCATE P LLA SET […]