Once you have created a script or an HTML content that you want to use in multiple pages is best stored in an external file and included in each page you want to use it. This is accomplished with the include and require functions.
PHP has four commands that can be used to include code from an external file:

To include an external file, you pass the file path to one of these four include functions as a string (single or double quotes).
  - Syntax:
include('external_file.php');
    OR
require('external_file.php');

The file path can be either absolute or relative to the current document.
  - An absolute path says where a file is starting from the root directory of the computer.
<?php
include('C:/xampp/htdocs/includes/file.php');            // windows
include('/usr/MAMP/htdocs/includes/file.php');           // unix (linux)
?>

  - A relative path uses the position of the current script file as the starting point. To move back one folder, use two periods together followed by a slash (../).
<?php
include('file.php');                   // "file.php" is in the curent script directory
include('../includes/file.php');       // "file.php" is in the "includes" folder, which is in the back directory
?>

For example, if you have a standard header and menu files (in a "templ" directory located in the curent folder), called "header.php" and "menu.php", that should be used on all pages. To include these files in a PHP script, use the include() (or require() ) function:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
 <title>Title page</title>
<body>

<?php include('templ/header.php'); ?>

<div id="menu">
<?php include('templ/menu.php'); ?>
</div>

<div id="content">some content</div>

</body>
</html>
With this method you can insert the same header and menu code in any PHP files in the Web site, all pages in the Web site can include the code of the header and menu files, and if you need to update the header or the menu later, you will only need to make changes in the "header.php" or "menu.php" file.

Using parentheses with the include commands is optional, the following would also work:
                include 'includes/file.php';
                include '/usr/MAMP/htdocs/includes/file.php';

When using a relative file path, you can use use "./" to indicate that the path begins in the current folder. Example:
                include('./includes/file.php');

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which type of <input> creates input fields that should contain a numeric value?
type="text" type="number" type="date"
<input type="number" name="points" min="5" max="80" />
Which CSS property allows to change the transparency of an element?
font-style opacity color
#id {
  filter:alpha(opacity=40);    /* for IE */
  opacity:0.4;
}
Click on the function that formats a number to specified number of characters.
toPrecision() exp() toFixed()
var num = 12.34567;
alert( num.toPrecision(3) );       // 12.3
Which function randomizes the order of the elements into an array?
natsort() shuffle() sort()
$lang =[10=>"PHP", 20=>"JavaScript", "site"=>"coursesweb.net");
shuffle($lang);
var_export($lang);     // array (0=>"coursesweb.net", 1=>"PHP", 2=>"JavaScript")
Include and Require

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