To add a new user defined function, click on the link on the properties page of the database.
You are now on the screen to create this function.
There are two types of user function:
The functions of standard treatment
The group functions in this case two functions must be defined, a function will be called at each line, the other will be at the end to finalize the result it is up to you to manage context.
Enter the code of your function by failing PHP tags ().
Remember to enter the number of arguments expected by your office.
Note that for all standard PHP functions there is a method to call without first declaring:
eg md5 function you can type in SQL: SELECT php ( 'md5', 'value') FROM label;