Functions in php

Functions
Declaring and Calling Functions
Passing Arguments to Functions
Returning Values from Functions
Understanding Variable Scope

Declaring and Calling Functions
• Declaring a function
• Calling a function
• Defining functions before or after calling them

Defining functions before or after
calling them

Passing Arguments to Functions
• Declaring a function with an argument
• Specifying a default value
• Defining a two-argument function
• Calling a two-argument function
• Multiple optional arguments
• Changing argument values

Declaring a function with an argument

Defining a two-argument function

Calling a two-argument function

Returning Values from Functions
• Capturing a return value
• Returning a value from a function
• Using a return value in an if( ) statement
• Returning an array from a function
• Using an array returned from a function
• Multiple return statements in a function
• Passing a return value to another function
• Using return values with if( )
• Functions that return true or false
• Assignment and function call inside a test expression

Returning a value from a function

Using a return value in an if( )
statement

Returning an array from a function

Using an array returned from a
function

Multiple return statements in a
function

Passing a return value to another
function

Using return values with if( )

Functions that return true or false

Assignment and function call inside a
test expression

Understanding Variable Scope
• Variable scope
• The $GLOBALS array
• Modifying a variable with $GLOBALS
• The global keyword

Modifying a variable with $GLOBALS

Functions in php

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Functions in php