Function or functions in PHP is a series of scripts that have utility (function) of a special program that has been initialized.
Functions can be divided into:
Built-in
User-defined function
External
Built-in function
Is a function that has been provided by the PHP that can necessarily be (directly) used / execution.
Various buil-in functions:
- Functions for arrays,
- mathematical function,
- Function string / text processing
- Function date
- The function checks the data type, the database functions
- Function and xml web, networking functions, etc.
To function date (date), and xml string will be described in a separate section.
An example of a buil-in function is a mathematical function in the search for value, eg searching for the root value of the quadrat, the quadrat values, trigonometric, etc
Exaple
Output
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