Php require file in variable

How to Make Your PHP include File and Gain Functionalities

PHP include file functionality means taking one PHP file and inserting it straight into the other. The code then treats it the same as a copied element.

Using this can save you a lot of time. If you copied and pasted the same piece to multiple places, you would have to update each one separately whenever a need arises. If you make PHP include file, you only need to modify the code in the original version of the inserted file.

Before you start using in your daily work, you have to get familiar with two statements: PHP require and PHP include. In this tutorial, we will help you do just that.

Contents

PHP include File: Main Tips

• PHP include and require statements are used to take all the code or text a certain file contains and to insert it where the statement is used.
• Dividing code into large sections like that makes it easier to read or modify.
• Using PHP include and require statements, you can create various templates to be used repeatedly (such as a standard header or footer). This is especially useful in frameworks, web applications and content management systems (CMS).

Correct Syntax Explained

You already know that to make a function behave as it should you must closely follow the correct syntax in our scripts. Now, we wish to successfully PHP include file. Let’s see how it should look in this case:

include ‘filename’;
or
require ‘filename’;

Note: there are no requirements to use parentheses (), just like when using print and echo statements.

Usage of Statements: Examples

In this section, we will review the usage of PHP include file method with code examples. After analyzing the way this statement is applied, you will be able to simplify your coding process as you won’t need to copy portions of code to different web pages.

Footer

Let’s begin by viewing a standard footer described in HTML. This is what such code would look like:

  
Welcome!
  require 'no_file_exists.php'; echo "I have a " . $color . " " . $car . "."; ?>  

To PHP insert file that contains the script used to display the footer where we want it, we use the PHP include statement:

  
Welcome!
 
Text line.
 
Texty text line.
  include 'footer.php';?>  

• Easy to use with a learn-by-doing approach
• Offers quality content
• Gamified in-browser coding experience
• The price matches the quality
• Suitable for learners ranging from beginner to advanced

• Free certificates of completion
• Focused on data science skills
• Flexible learning timetable

• Simplistic design (no unnecessary information)
• High-quality courses (even the free ones)
• Variety of features

• Nanodegree programs
• Suitable for enterprises
• Paid Certificates of completion

Menu

Now, here is a file called menu.php:

Imagine you want each page on your personal website to have a menu element. To make the code work the way we want, you should apply this code:

html> body> div class="menu">  include 'menu.php'; ?> div> h1>Welcome! h1> p>Text line. p> p>Texty text line. p> body> html>

Variables

When you decide to PHP include files that hold variables, bear in mind the system treats both of your codes as one creation. Therefore, it doesn’t matter if a particular variable is declared in the code you included or the one you included it to: it will apply in both.

First, we should have a file called variables.php, which contains some of the variables we need:

If we need our code to use the variables declared in variables.php, we will PHP include file into our script:

html> body> h1>Welcome! h1>  include 'variables.php'; echo "I have a " . $color . " " . $car . "."; ?> body> html>

Differences Between PHP include and require

In the examples above, we used the include function. You can also use the require statement for PHP includes, though there is one difference between those two that you should keep in mind.

Using include allows the script to continue even if the specified file cannot be accessed. It will run just like it would if there was no file included:

html> body> h1>Welcome! h1>  include 'no_file_exists_oh_no.php'; echo "I have a" . $color . " " . $car . "."; ?> body> html>

However, if we use require , the system understands the included file as neccesary. Therefore, if the specified file isn’t found or cannot be accessed otherwise, we will catch a fatal error, and the rest of the code will not be executed:

  
Welcome!
  require 'no_file_exists.php'; echo "I have a " . $color . " " . $car . "."; ?>  

Note: require is used when the file is absolutely crucial to the execution of the code. include is used when the presence of the file may be optional.

PHP include File: Summary

• When you use include and require statements in your PHP scripts, code or text from an external file is placed right there in the script.
• This lets you save time as you can create certain templates and reuse them multiple times.
• If you use the same block of code in different places, inserting it as a file makes it easier to modify later.

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PHP Include Files

The include (or require ) statement takes all the text/code/markup that exists in the specified file and copies it into the file that uses the include statement.

Including files is very useful when you want to include the same PHP, HTML, or text on multiple pages of a website.

PHP include and require Statements

It is possible to insert the content of one PHP file into another PHP file (before the server executes it), with the include or require statement.

The include and require statements are identical, except upon failure:

• require will produce a fatal error (E_COMPILE_ERROR) and stop the script
• include will only produce a warning (E_WARNING) and the script will continue

So, if you want the execution to go on and show users the output, even if the include file is missing, use the include statement. Otherwise, in case of FrameWork, CMS, or a complex PHP application coding, always use the require statement to include a key file to the flow of execution. This will help avoid compromising your application’s security and integrity, just in-case one key file is accidentally missing.

Including files saves a lot of work. This means that you can create a standard header, footer, or menu file for all your web pages. Then, when the header needs to be updated, you can only update the header include file.

Syntax

PHP include Examples

Example 1

Assume we have a standard footer file called «footer.php», that looks like this:

To include the footer file in a page, use the include statement:

Example

Welcome to my home page!

Some text.

Some more text.

Example 2

Assume we have a standard menu file called «menu.php»:

All pages in the Web site should use this menu file. Here is how it can be done (we are using a element so that the menu easily can be styled with CSS later):

Example

Welcome to my home page!

Some text.

Some more text.

Example 3

Assume we have a file called «vars.php», with some variables defined:

Then, if we include the «vars.php» file, the variables can be used in the calling file:

Example

Welcome to my home page!

echo «I have a $color $car.»;
?>

PHP include vs. require

The require statement is also used to include a file into the PHP code.

However, there is one big difference between include and require; when a file is included with the include statement and PHP cannot find it, the script will continue to execute:

Example

Welcome to my home page!

echo «I have a $color $car.»;
?>

If we do the same example using the require statement, the echo statement will not be executed because the script execution dies after the require statement returned a fatal error:

Example

Welcome to my home page!

echo «I have a $color $car.»;
?>

Use require when the file is required by the application.

Use include when the file is not required and application should continue when file is not found.

Источник

How to Make Your PHP include File and Gain Functionalities

PHP include file functionality means taking one PHP file and inserting it straight into the other. The code then treats it the same as a copied element.

Using this can save you a lot of time. If you copied and pasted the same piece to multiple places, you would have to update each one separately whenever a need arises. If you make PHP include file, you only need to modify the code in the original version of the inserted file.

Before you start using in your daily work, you have to get familiar with two statements: PHP require and PHP include. In this tutorial, we will help you do just that.

Contents

PHP include File: Main Tips

• PHP include and require statements are used to take all the code or text a certain file contains and to insert it where the statement is used.
• Dividing code into large sections like that makes it easier to read or modify.
• Using PHP include and require statements, you can create various templates to be used repeatedly (such as a standard header or footer). This is especially useful in frameworks, web applications and content management systems (CMS).

Correct Syntax Explained

You already know that to make a function behave as it should you must closely follow the correct syntax in our scripts. Now, we wish to successfully PHP include file. Let’s see how it should look in this case:

include ‘filename’;
or
require ‘filename’;

Note: there are no requirements to use parentheses (), just like when using print and echo statements.

Usage of Statements: Examples

In this section, we will review the usage of PHP include file method with code examples. After analyzing the way this statement is applied, you will be able to simplify your coding process as you won’t need to copy portions of code to different web pages.

Footer

Let’s begin by viewing a standard footer described in HTML. This is what such code would look like:

  
Welcome!
  require 'no_file_exists.php'; echo "I have a " . $color . " " . $car . "."; ?>  

To PHP insert file that contains the script used to display the footer where we want it, we use the PHP include statement:

  
Welcome!
 
Text line.
 
Texty text line.
  include 'footer.php';?>  

• Easy to use with a learn-by-doing approach
• Offers quality content
• Gamified in-browser coding experience
• The price matches the quality
• Suitable for learners ranging from beginner to advanced

• Free certificates of completion
• Focused on data science skills
• Flexible learning timetable

• Simplistic design (no unnecessary information)
• High-quality courses (even the free ones)
• Variety of features

• Nanodegree programs
• Suitable for enterprises
• Paid Certificates of completion

Menu

Now, here is a file called menu.php:

Imagine you want each page on your personal website to have a menu element. To make the code work the way we want, you should apply this code:

html> body> div class="menu">  include 'menu.php'; ?> div> h1>Welcome! h1> p>Text line. p> p>Texty text line. p> body> html>

Variables

When you decide to PHP include files that hold variables, bear in mind the system treats both of your codes as one creation. Therefore, it doesn’t matter if a particular variable is declared in the code you included or the one you included it to: it will apply in both.

First, we should have a file called variables.php, which contains some of the variables we need:

If we need our code to use the variables declared in variables.php, we will PHP include file into our script:

html> body> h1>Welcome! h1>  include 'variables.php'; echo "I have a " . $color . " " . $car . "."; ?> body> html>

Differences Between PHP include and require

In the examples above, we used the include function. You can also use the require statement for PHP includes, though there is one difference between those two that you should keep in mind.

Using include allows the script to continue even if the specified file cannot be accessed. It will run just like it would if there was no file included:

html> body> h1>Welcome! h1>  include 'no_file_exists_oh_no.php'; echo "I have a" . $color . " " . $car . "."; ?> body> html>

However, if we use require , the system understands the included file as neccesary. Therefore, if the specified file isn’t found or cannot be accessed otherwise, we will catch a fatal error, and the rest of the code will not be executed:

  
Welcome!
  require 'no_file_exists.php'; echo "I have a " . $color . " " . $car . "."; ?>  

Note: require is used when the file is absolutely crucial to the execution of the code. include is used when the presence of the file may be optional.

PHP include File: Summary

• When you use include and require statements in your PHP scripts, code or text from an external file is placed right there in the script.
• This lets you save time as you can create certain templates and reuse them multiple times.
• If you use the same block of code in different places, inserting it as a file makes it easier to modify later.

Источник