Php include vs require

When building a robust PHP application, it's important to write modular code.

The include expression includes and evaluates the specified file. The documentation below also applies to require. For example, if a filename begins with.. When a file is included, the code it contains inherits the variable scope of the line on which the include occurs. Any variables available at that line in the calling file will be available within the called file, from that point forward. However, all functions and classes defined in the included file have the global scope.

Php include vs require

As we know PHP allows us to create various functions and various elements that are used multiple times in multiple pages. This can be avoided if we follow and use the concept of file inclusion which helps us to include various files including text or codes into a single program which saves the effort of writing the full function or code multiple times. This also provides another advantage. If we want to change any code then instead of editing it in all the files, we just need to edit the source file and all codes will be automatically changed. There are two functions that help us to include files:. PHP include function: This function is used to copy all the contents of a file called within the function, text wise into a file from which it is called. This happens before the server executes the code. Example : This example is using the include function in PHP. Now, try to include this file into another PHP file index. PHP require function: The require function performs same as the include function. It also takes the file that is required and copies the whole code into the file from where the require function is called. Example : This example is using the require function in PHP. Now, if we try to include this file using require function this file into a web page we need to use a index. We will see that the contents of both files are shown. Difference between include function vs require function : Both functions act as same and produce the same results, but if by any chance a fatal error arises, then the difference comes to the surface, which we will see following this example.

If you are including a file from your own site, do not php include vs require a URL however easy or tempting that may be. In this post, we started by talking about the importance of writing modularized and reusable code. Submit a Pull Request Report a Bug.

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In this tutorial, we are going to see the list of functions used in PHP to include an external file into a program. PHP provides various functions including external files. It is required if the current code dependency is on the external file to be included. For example, if we want to create an instance of a class defined in a separate class file, then it has to be included before creating an instance of it. The following list of functions is used to include an external file in a PHP program. In this tutorial, we are going to compare these functions with suitable examples. It accepts the external file path and checks if the file exists or not. If the file does not exist in the specified path, then the include will return a PHP warning. By including an external file by using the PHP include function, the variable, functions, and classes of the included file can be used in the program where it is included. The following code shows an example for including an external file using PHP include.

Php include vs require

The include expression includes and evaluates the specified file. The documentation below also applies to require. For example, if a filename begins with..

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This can immediately lead to a fatal error if the file you happen to be including multiple times contains a function declaration or a class declaration. The require function produces a fatal error and stops the script's execution if there is a problem loading a file. Software Development Course typically range from a few weeks to several months, with fees varying based on program and institution. Get Certified Document your knowledge. Scripting the same feature through several pages takes time and effort. Using the include function, include one PHP file into another one. Now that you know how to include files in your PHP code, go ahead and try to implement this in a personal project. View More. Improved By :. Example : This example is using the include function in PHP. What kind of Experience do you want to share? It allows developers to split code into reusable components that can be included in multiple files or projects. Tip: It is recommended to use the require statement if you're including the library files or files containing the functions and configuration variables that are essential for running your application, such as database configuration file.

In the world of web development, PHP Hypertext Preprocessor stands as a robust and versatile scripting language, powering a significant portion of the web. One of its most powerful features is the ability to include external files using the include and require functions. These functions might appear simple on the surface, but they hold incredible potential for enhancing code organization, modularity, and reusability.

Related Articles. Using the include function, include one PHP file into another one. How to remove duplicate values from array using PHP? Enhance the article with your expertise. Report issue Report. W3Schools offers a wide range of services and products for beginners and professionals, helping millions of people everyday to learn and master new skills. In case you have any questions for us, leave them in the comments section below, and our experts will get back to you! Solve Coding Problems. This also provides another advantage. Share This Article:. PHP require function: The require function performs same as the include function. HTML Examples. CSS Examples. We can then include these in our index web-page.