How to ensure your website runs properly after upgrading to PHP7.4

How to ensure that your website can run normally after upgrading to PHP7.4

With the continuous development of technology, PHP is also constantly updated and upgraded, PHP7.4 is one of the latest versions. Upgrading to PHP7.4 will not only get better performance and security, but also enjoy more new features and functions. However, for website administrators, upgrading PHP versions can pose some challenges, including ensuring that the website functions properly after the upgrade. This article will introduce some methods and sample code to help you ensure that your website can run normally after upgrading to PHP7.4.

1. Environment Check
   Before upgrading the PHP version, first check whether your server environment meets the requirements of PHP7.4. You can check by the following method:

<?php
phpinfo();
?>

Create an info.php file in the root directory of your website and copy and paste the above code into the file. Then access the info.php file in the browser, and you will see a page containing PHP version information and various configuration parameters. Make sure that the PHP version is 7.4 and above, and also check if there are other modules and extensions that are incompatible with PHP7.4.

2. Check code compatibility
   After upgrading the PHP version, there may be some code incompatibility issues. Here are some common situations that can cause problems and how to fix them.

a. Obsolete functions and methods
PHP7.4 has removed some obsolete functions and methods, which may cause problems on your website. You can use a coding tool like PHP CodeSniffer to check whether your code uses these outdated functions and methods. If so, you can use new replacement functions or methods to fix the code.

For example, the obsolete function money_format() in PHP7.4 can be replaced by number_format().

b. Remove global variables
In PHP7.4, some global variables have been removed, such as $HTTP_POST_VARS and $HTTP_GET_VARS. If these global variables are used in your code, you need to modify them accordingly.

c. Remove the reference symbols
In previous PHP versions, the reference symbols & were allowed to be used in function calls. But in PHP7.4, the called function cannot return a reference. Therefore, if there is a writing method similar to $value = &myFunction() in your code, you need to modify it to $value = myFunction().

d. Class name case issue
In previous PHP versions, class names were less case-sensitive. But in PHP7.4, class names are more case-sensitive. Therefore, if there is an inconsistency in the case of class names in your code, you need to make corresponding repairs.

3. Error handling and logging
   After upgrading the PHP version, some unknown problems and errors may occur. Here are some ways to handle errors and logging.

a. Error reporting
In the php.ini configuration file in the root directory of your website, find the two configurations error_reporting and display_errors item. Set error_reporting to E_ALL and display_errors to On. This will display error information on the web page and help you discover it in time. problem and fix it.

b. Error logging
You can record the error log to a file for later analysis. Find the error_log configuration item in the php.ini configuration file and set it to the file path where you want to record the error log. Make sure the file has write permissions.

<?php
error_reporting(E_ALL);
ini_set('display_errors', 'On');
ini_set('error_log', '/path/to/error_log.txt');
?>

c. Exception handling
Use the exception handling mechanism to better manage and handle errors. In your code, catch and handle exceptions through try-catch blocks.

try {
    // 你的代码
} catch (Exception $e) {
    // 异常处理
    error_log($e->getMessage());
}

4. Testing and Iteration
   After upgrading the PHP version, be sure to fully test the website. You can use methods such as unit testing, functional testing, and performance testing to verify whether your website is running properly on the new PHP version. If problems are found, fix them in time and retest until your website runs normally on PHP7.4.

Summary
Upgrading to PHP7.4 can bring better performance and security, and it is also a manifestation of advancing with the times. But before upgrading, be sure to perform environment checks, code compatibility checks, and error handling and logging settings. And conduct sufficient testing after the upgrade to ensure that your website can run normally on PHP7.4.

The above are some suggestions and sample codes on how to ensure that your website can run normally after upgrading to PHP7.4. Hope this helps!

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