Below is a very simple bit of code you can use to test a MySQL Database Connection.

Before any wars start, I want to clarify that the code below is NOT my own code, but unfortunately I am uncertain where I obtained it from. The code below basically create dynamic thumbnails of an image, you parse the following to it:

Image location,
Maximum Width
Maximum Height

It will then scale your image down, please do not confuse this with converting your image into a square, or whatever shape you are after. The code below will maintain aspect ratio of your image, and will use the values you parse as a guidline. Extremely handy when you are building gallery websites.

The below may be a simple line of code, but it is extremely useful to help prevent SQL Injection. There are many other methods, such as removing certain values from your string, but this is by far superior, as it does not limit what can be inserted to your database.

Two very usefull functions to have around.

(note: dollarfy requires commify to work)

This php script provides a unique random key with 32 characters and can be used to avoid the system to pass some primary keys across the url, by example.

Function that splits a given string into sections based on the allowed length for a section. Does not split words up. Splits string on Space character (can be set to another character)

Takes a given directory and lists all the files and folders under it, including sub folders. Resulting array contains associative (folders) and indexed (files) elements. Doesn't return "." and ".."

This function takes a directory, and a "folder" search parameter.
If it finds the directory (either in single level, or any sub folder) it will return the relative path of that folder. "FALSE" if not found. Skips over files and "." and ".." directories. Recursive by default.

This function tries to locate a file in a give folder (either single level, or in any sub folder). Returns the relative file and path, or FALSE if not found. Skips over "." and "..".

This is a quick and easy method to generate a somewhat random password. This simply generates the MD5 hash for the integer returned by the time() function and then truncates it to the specific length.