PHP Functions

1
PHP Functions
2
Function Advantages

• Blocks of code.
• Provide a way to reuse code.
• A function should only perform one task. This
  helps make the code more modular.
• Try example 2-3 using the bold function.
• Note that you pass an argument to the function.
• In this case the argument is a string value.

3
Function - Parts and Pieces

• function bold(string)
• print ltbgt . string. ltbgt

Declares the function
Name of the function
Parameter accepted by the function. Parameter and
return types are not declared when a function is
defined.
4
Variable Scope

• The variables used in a function are limited to
  that function
• function doublevalue(var)
• temp var 2
• variable 5
• doublevalue(variable)
• print \temp is temp
• // the output is temp is

5
Global Variables

• Variables that are the same everywhere in your
  code.
• Be careful when using global variables.
• Unlike most other programming languages, global
  variables are declared inside the function
  itself.
• function doublevalue()
• global temp
• temp temp 2