Why does the browser only display code when writing PHP? How to deal with it?

In recent years, with the continuous development of the Internet and computer technology, Web technology has become an increasingly prosperous field. Among them, PHP, as a popular server-side scripting language, is widely used in web development. However, sometimes when we access a PHP page in a browser, we find that the page only displays the PHP code, but does not execute it, and has no corresponding functions. This phenomenon not only troubles us, but also brings various inconveniences to our work. Therefore, this article will explore the causes and solutions to this problem.

First, let us understand how PHP and the browser interact. In a general web application, the client sends a request to the server. After receiving the request, the server executes the corresponding PHP script and returns the result to the client. The client browser then parses and renders the result into the final page. Therefore, in theory, when accessing a PHP page in a browser, the content of the page should be displayed normally, rather than the source code of the page.

So, when only PHP code is displayed, we should first consider the following reasons:

1. PHP is not installed correctly

PHP is a server-side scripting language that needs to be run on the server to execute. If the PHP environment is not installed correctly on the server side, the browser will only return the PHP source code when accessing the PHP page.

2. The PHP file extension (.php) is not recognized correctly by the server

In most web servers, PHP scripts have the file extension .php. If the server side is not configured accordingly, that is, the .php extension is not associated with the PHP interpreter, then the browser will only return the PHP source code when accessing the PHP page.

3. PHP files are not processed and executed correctly

Sometimes, when we write PHP code, there may be syntax errors or logic errors, causing the PHP file to not be processed. Proper handling and execution. In this case, when accessing the PHP page, the browser will only display the PHP code.

So, for the above reasons, let’s introduce in detail how to solve this problem.

First of all, when PHP is not installed correctly, we need to install the PHP environment. The official PHP website provides PHP installation packages for various operating system environments such as Windows, Linux, Unix and Mac OS X. After the installation is complete, you need to place the corresponding PHP file in the root directory of the web server, and ensure that the extension of the PHP file is .php.

Secondly, when the PHP file extension is not correctly recognized by the server, we need to configure it accordingly. Taking the Apache server as an example, you can add the following code to the httpd.conf configuration file:

AddType application/x-httpd-php .php

In this way, the Apache server will associate the .php extension with the PHP interpreter and be able to correctly process PHP files. Likewise, Nginx and other web servers also have corresponding configuration methods.

Finally, when the PHP file cannot be processed and executed correctly, we need to debug and modify the PHP code. You can use debugging tools such as Xdebug and Zend Debugger to find errors in PHP files and make corresponding modifications. In addition, you can also use PHP's own error reporting mechanism to output error information to the browser or PHP log file for troubleshooting and repair.

To sum up, when the browser only displays PHP code, we need to handle it accordingly for different reasons. Only by correctly installing the PHP environment, configuring the web server, and debugging PHP files can we ensure that the PHP page can be displayed and executed correctly in the browser.

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