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Uploaded byJaydeep Kale
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Comprehensive Guide to PHP Functions: Syntax, Types, and Usage

Explore PHP functions including syntax, built-in and user-defined types, parameters, return values, and default parameters for effective coding.

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PHP Functions Prepared By:- Kale J. N. Assistant Professor, Computer Engineering, Sanjivani College of Engineering, Kopargaon Prepared By: Kale J. N.
1. Introduction to Functions in PHP • A function is a reusable block of code that performs a specific task. Prepared By: Kale J. N.
2. Syntax of Function function functionName() { // code to execute } • Example: <?php function greet() { echo "Hello Students"; } greet(); // Function call ?> • Output: • Hello Students Prepared By: Kale J. N.
Types of Functions in PHP • Built-in Functions • User-defined Functions • Keywords are NOT case- sensitive • ECHO "Hello"; • echo "Hello"; Prepared By: Kale J. N.
3.1 Built-in Functions • Predefined functions provided by PHP. • Examples: echo strlen("Hello"); // Length of string echo date("Y"); // Current year echo sqrt(16); // Square root • Prepared By: Kale J. N.
3.2 User-defined Functions • Functions created by programmer. function add() { echo 5 + 10; } add(); Prepared By: Kale J. N.
4. Function with Parameters • Parameters allow passing values to a function. • Syntax: function functionName($param1, $param2) { // code } • Example: <?php function add($a, $b) { echo $a + $b; } add(5, 10); // Output: 15 ?> Prepared By: Kale J. N.
5. Function with Return Value Prepared By: Kale J. N. • Instead of printing, function can return value. <?php function add($a, $b) { return $a + $b; } $result = add(5, 10); echo $result; // 15 ?> •
6. Default Parameter Values <?php function greet($name = "Guest") { echo "Hello " . $name; } greet(); // Hello Guest greet("Jay"); // Hello Jay ?> Prepared By: Kale J. N.