PHP_Functions.pptx function notes slides

Introduction to Functions
• • A function is a block of code that performs a
specific task.
• • Advantages:
• - Code reusability
• - Better readability
• • Types:
• - Built-in
• - User-defined

Simple Function
• • A function without parameters.
• Example:
• function simple() {
• echo 'Welcome to PHP';
• }
• simple();

Parameterized Function
• • Functions that accept parameters.
• Example:
• function add($a, $b) {
• echo $a + $b;
• }
• add(23,34);

Call by Value
• • Default in PHP.
• • Original variable not affected.
• Example:
• function increment($i){ $i++; }
• $i=10; increment($i);
• Output: 10

Call by Reference
• • Use & symbol.
• • Original variable is modified.
• Example:
• function increment(&$i){ $i++; }
• $i=10; increment($i);
• Output: 11

Default Argument Function
• • Parameters can have default values.
• Example:
• function msg($name='Study'){
• echo 'Welcome $name';
• }
• msg(); // Welcome Study
• msg('Glance'); // Welcome Glance

Recursive Function
• • Function calls itself.
• • Used in factorial, Fibonacci, etc.
• Example:
• function factorial($n){
• if($n<=1) return 1;
• return $n*factorial($n-1);
• }

PHP_Functions.pptx function notes slides

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