Most people understand the basics of mathematical operators and comparison operators because they are the basic math we all grew up learning.  Sometimes people have a bit more trouble grasping the Boolean logic used in computer programs.  Here is a quick tutorial to help you start understanding boolean logic.

An array is a type of data structure we use in PHP to store information.  Usually the information that we store in the array comes form a MySQL database or some other outside data source which we then temporarily store in an array to work with it.  Learn more about arrays.

If you need to find the hyperbolic tangent of a number, look no further... Tanh() is a PHP function that does exactly that.  Tanh (x) will return the hyperbolic tangent of x, with is calculated by taking SinH/CosH.  The resulting curve's inverse is the arc hyperbolic tangent.  Read More.

You can generate a unique identification in PHP using the uniqid () PHP function.  This ID will be 13 or 23 characters long and you can append your own text to the beginning or end of it (so instead of 1234567891234 you could have myid1234567891234).  To learn more and to see some examples of uniqid () in action, check out this article.