Php include vs require

Include in PHP helps one build various functions and elements that can be reused through several pages. Scripting the same feature through several pages takes time and effort.

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.

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.

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In the realms of computer science and software engineering, reusability and modularity are considered to be important design principles to keep in mind when building software programs. It is therefore advocated to break down your code into several smaller, atomic parts that are independent, reusable and replaceable. This makes projects easier to debug, reduces redundancy, saves an awful lot of memory and resources, and allows for localized, thus more stable updates. A very common example of this can be seen in any website you visit on the internet. Most websites share a very common abstract structure - each webpage has a navigation bar or header , a footer, and some content between the two. It is a common practice of web developers to reuse components like the header, footer, and many others across all the pages of the website. The virtues of reusability and modularity are not just restricted to web components - we can just as effectively compartmentalize and reuse external classes, functions, and variables.

Include in PHP helps one build various functions and elements that can be reused through several pages. Scripting the same feature through several pages takes time and effort. This can be avoided if we adopt and use the file inclusion principle, which allows us to combine several files, such as text or codes, into a single program, saving time and effort. PHP Include helps to include files in various programs and saves the effort of writing code multiple times. If we want to change a code, rather than editing it in all of the files, we can simply edit the source file, and all of the codes will be updated automatically.

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.. 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. Example 1 Basic include example. If the include occurs inside a function within the calling file, then all of the code contained in the called file will behave as though it had been defined inside that function.

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Connect with us on Facebook and Twitter for the latest updates. More about this function can be found on the PHP official documentation page. However, all functions and classes defined in the included file have the global scope. Previous Page Next Page. Please use proper input validation if you use variables in an include statement. My W3Schools Tutorials. In the Main. Easy Normal Medium Hard Expert. Please Login to comment Typing Speed Test your typing speed. However, for large-scale software systems, the counter-intuitive truth is that you would want your application to more strongly alert you about any potential inconsistency or inaccuracy in your code. This Post Graduate Program will help you boost your career as a software engineer. Suggest Changes. Suggest changes. Example 1 Basic include example.

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.

W3Schools is Powered by W3. Example 5 include and the return statement return. Did you find this article helpful or see something you disagree with or think should be improved? It will definitely save some trouble for those users who work under Windows and transport their applications to an Unix-based server. Exercise: Write a correct syntax to include a file named "footer. Build fast and responsive sites using our free W3. Code Editor Try it With our online code editor, you can edit code and view the result in your browser. Host your own website, and share it to the world with W3Schools Spaces. Move the includeFile s out of the document root of your project. Like Article Like. In the above example, we saw how we were able to execute a function defined in an external file from our main file. Is this website helpful to you? Apart from that, both functions work exactly the same.