Defining and Using Functions in PHP

Defining and Using Functions in PHP 

A function is a self-contained piece of code which carries out a particular task or function. benefit of using functions is that they are reusable

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<?php //Defining a Function //syntax for defining a function function addNumbers($num1, $num2) {     $result = $num1 + $num2;     return $result; } $total = addNumbers(5, 10); //echo $total; //result 15   //Organizing Functions function hello() {     echo "<h1>HELLO!</h1>";     echo "<p>Welcome to my web site</p>"; }   function printBreak($text) {     echo "$text<br>"; }   function addNumbers($num1, $num2) {      return $num1 + $num2; }   echo hello(); echo printBreak("This is a line"); echo addNumbers(3.75, 5.645); //9.39536.75   //Accepting a Variable Number of Arguments function calcAverage() {     // initialize value to be used in calculation     $total = 0;             // find out how many arguments were given     $arguments = func_num_args();            // loop to process each argument separately     for ($i = 0; $i < $arguments; $i++) {         // add the value in the current argument to the total         $total += func_get_arg($i);     }       // after adding all arguments, calculate the average     $average = $total / $arguments;        // return the average     return $average; }   // invoke the function with 5 arguments //echo calcAverage(44, 55, 66, 77, 88); //output 66     // invoke the function with 8 arguments echo calcAverage(12, 34, 56, 78, 90, 9, 8, 7); //ouput 36.75