Defining And Using Functions In Php Web-development (jquery) 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
<?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
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