how to define function in php

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1<?php
2function writeMsg() {
3    echo "Hello world!";
4}
5
6writeMsg(); //call the function
7?>

1function functionName() {
2    //code to be executed;
3}

1function functionName() {
2    //code to be executed;
3}
4functionName();

1<html>
2   
3   <head>
4      <title>Writing PHP Function with Parameters</title>
5   </head>
6   
7   <body>
8   
9      <?php
10         function addFunction($num1, $num2) {
11            $sum = $num1 + $num2;
12            echo "Sum of the two numbers is : $sum";
13         }
14         
15         addFunction(10, 20);
16      ?>
17      
18   </body>
19</html>

1#functions
2
3<?php
4    #function - a block of code that can be repeatedly called
5
6    /*
7    How to format functions
8    1. Camel Case myFunction()
9    2.Lower case with underscore my_function()
10    3. Pascal Cae - MyFunction() usally used with classes
11    */
12    function simpleFunction(){
13        echo 'Hello John';
14
15    }
16    //Run the function like so
17    simpleFunction();
18
19    //function with param
20    function sayHello($name = " you out there!"){
21        echo "<br>and<br> Hello $name<br>";
22    }
23    sayHello('John');
24    sayHello();
25
26    //Reurn Value
27    function addNumbers($num1, $num2){
28        return $num1 + $num2;
29     }
30     echo addNumbers(2,3);
31
32     // By Reference
33
34     $myNum = 10;
35
36     function addFive($num){
37         $num += 5;
38     }
39
40     function addTen(&$num) {
41         $num += 10;
42     }
43
44     addFive($myNum);
45     echo "<br>Value: $myNum<br>";
46
47     addTen($myNum);
48     echo "Value: $myNum<br>";
49
50
51?>

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