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:

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.
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 (../).
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">
 <title>Title page</title>

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

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

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

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:

Daily Test with Code Example

Which tag renders as emphasized text, displaying the text oblique?
<strong> <pre> <em>
<p>Web development courses: <em>CoursesWeb.net</em></p>
Which CSS property defines the space between the element border and its content?
margin padding position
h3 {
  padding: 2px 0.2em;
Click on the method which returns the first element that matches a specified group of selectors.
getElementsByName() querySelector() querySelectorAll()
// gets first Div with class="cls", and shows its content
var elm = document.querySelector("div.cls");
Indicate the PHP variable that contains data from a form sent with method="post".
if(isset($_POST["field"])) {
  echo $_POST["field"];
Include and Require

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