PHP Day 4: Functions

This seven-minute video covers the basics of making functions, using functions, returning values, and reading function prototypes.

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Links for PHP Day 4: Functions

Making functions:

• PHP Functions - An overview of creating your own functions, much more simple (in other words, less frightening) than the PHP manual.
• PHP: Functions - More advanced explanations and details from the PHP manual.
• Note: I forgot to mention that the naming rules for functions are the same as for variables.

Returning values:

• Return Values - A good overview from the Practical PHP Programming wiki.
• PHP: Returning Values - A more advanced overview from the PHP manual.

Function reference:

• PHP: Function Reference - Huge reference page for PHP functions. I suggest looking at the Mathematical Functions, String Functions, and maybe the Variable Handling Functions.
• Note: I also recently discovered that you can look up any function by typing in the URL: PHP.net/function-name. For example, PHP.net/echo or PHP.net/floor.

Reading function prototypes:

• How to Read a Function Definition (Prototype) - The PHP manual’s page on reading function prototypes.
• How to Read Function Prototypes - Another good overview.

Sorry if there’s a bit too much information here, but there’s a lot to cover! Please let me know if you think this is too much (or too little). Personally, I was a bit overwhelmed at first (especially after relaxing all weekend), but then things came together and it all made sense.