Solution to PHP Fatal error: Uncaught Error: Call to undefined function stats_rand_gen_normal()

PHP is a widely used server-side scripting language, but various problems may arise when using PHP for development. This article will discuss one of the common problems: PHP Fatal error: Uncaught Error: Call to undefined function stats_rand_gen_normal(), and introduce its causes and solutions.

1. Problem Description

When we execute a piece of PHP code, we may encounter the following error message:

PHP Fatal error: Uncaught Error: Call to undefined function stats_rand_gen_normal()

This error message indicates that the undefined function stats_rand_gen_normal() was called, thus causing the error. This error often occurs on Windows servers using PHP installation packages, and in this case, the php_stats.dll dynamic link library is not loaded correctly.

2. Cause analysis

The error message indicates that PHP cannot find the function named stats_rand_gen_normal(), so the first step is to find where this function is where defined.

You can find it by searching the PHP manual. stats_rand_gen_normal() The function belongs to the Statistics extension of PHP and is used to generate a composite normal (Gaussian) distribution value. Typically, it is installed via the Statistics extension for PHP.

However, in some cases, the extension has been installed correctly but the error still occurs. This is usually caused by the extension not being loaded correctly.

3. Solution

Now that we have determined the cause of the problem, here are some possible solutions.

3.1 Make sure the extension has been installed correctly

To use the Statistics extension, you need to install it first. You can find the installation method of Statistics extension in [PHP Chinese Manual](https://www.php.net/manual/zh/book.stats.php).

If the extension has been installed correctly but you still get errors, consider it a loading issue and here are some things you can try.

3.2 Make sure the extension has been loaded

In PHP, you can enable the use of the Statistics extension through the following command in the php.ini file (modify as appropriate):

extension_dir = "C:phpext"
extension=php_stats.dll

Note that the extension_dir command needs to point to the directory where the PHP extension is installed, and the extension command must point to the php_stats.dll file, which should Same as PHP installation version.

If you still cannot find stats_rand_gen_normal() after writing the php.ini file in this way, you need to try the following methods.

3.3 Enabling the Statistics extension

In some cases, PHP attempts to use outdated extension numbers, which results in the extensions not being found or loaded. Therefore, extension numbers need to be specified directly to load and cache them. Code example:

extension=php_stats.dll

Where, php_stats.dll is the file name of the Statistics extension, add to this file name Path is enough.

3.4 Check PHP version

If the problem still cannot be solved even after updating the php.ini file according to the above steps, you need to make sure that the version of PHP has been updated to the correct version.

In some cases, it is necessary to use the latest version of PHP to resolve stats_rand_gen_normal() not found issues, as it may need to be in a new version of PHP to work properly.

4. Summary

Call to undefined function stats_rand_gen_normal in PHP will cause a fatal error, so when PHP Fatal error: Uncaught Error: Call to undefined function stats_rand_gen_normal (), we should first check whether the Statistics extension has been installed and loaded correctly. If these steps don't work, you can try specifying the extension number or updating your PHP version to resolve the issue.

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