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Tips and short articles on this subject
Adding extensions to PHP Open Source applications - callbacks
Static variables and ampersands in PHP
A variable number of arguments in a PHP function
Global - Tcl, PHP, Python
Static variables in PHP
Clean my plate, but keep my wine bottle. (PHP; Static)
is there a lookup function in php?
Returning multiple values from a function (Perl, PHP, Python)
A better alternative to cutting and pasting code
PHP - static declaration
Global, Superglobal, Session variables - scope and persistance in PHP
A lazy programmer is a good programmer
Do not duplicate your code
Don't repeat code - use loops or functions
Functions and commands with dangerous names
Code and code maintainance efficiency
Passing information into and out of PHP functions
Call by name v call by value
There is a function in PHP to do that
Variable Scope
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PHP module H105
Functions
Exercises, examples and other material relating to training module H105. This topic is presented on public courses Learning to program in PHP, PHP Programming, Object Oriented Programming in PHP

PHP Programming - Learn PHP, and its use as a Web-scripting language This course covers the fundamentals of programming in PHP and Web-related issues ...
http://www.wellho.net/course/phfull.html  [course]
Learning to program in PHP - Learn PHP, and its use as a Web-scripting language This course covers the fundamentals of programming in PHP and Web-related ...
http://www.wellho.net/course/pffull.html  [course]
Object Oriented programming with PHP - Making best use of PHP in larger applications This course introduces you to object oriented programming principles, ...
http://www.wellho.net/course/pofull.html  [course]
Function in PHP and Python and subs in Perl can only return one "thing" - one item, one object. But all three languages allow that returned item to be ...
http://www.wellho.net/mouth/1202_Ret ... thon-.html  [short article]
When you call a function, you typically want a nice clean start with no "leftovers" from the previous call. And that's what you get by default in PHP. ...
http://www.wellho.net/mouth/1380_Sta ... n-PHP.html  [short article]
A function - "dress" Function to dress a line of text
http://www.wellho.net/resources/ex.php4?item=h105/funky.php  [code sample]
"Global" is a poor choice of word! It really means "share this variable in this function with the variable of the same name at the top level" but there ...
http://www.wellho.net/mouth/936_Glob ... n-PHP.html  [short article]

If you have a piece of code that you want to share between a number of PHP web pages, write it into a function! A function is a named block of code into which you can pass a number of variables (known as parameters) and from which a result can be returned.

This topic is presented on public courses Learning to program in PHP, PHP Programming, Object Oriented Programming in PHP

Examples from our training material
callback   Calling a list of functions named in an array
dressing.inc   example of "call by name" and defaulting parameters
dropahead.php   Selection from the week ahead
funk2.php   Example with local, global and static variables
funk3.php   Loading functions from an include file
funky.php   Defining and calling a function
funsan.php   Simple sanitisation and sticky field example using functions
hotdiary.php   PHP Diary generator
near.php   Ordnance Survey and Map reference point calculations
stademo.php   use of a static variable in PHP
Pictures
call by name and call by value - PHP
Background information
You may download this module as a sample of our material
Topics covered in this module
Global and static variables.
Loading functions from another file.
Defaulting parameters.
Call by value v call by name.
Example.
Object oriented PHP.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.


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