The script generates the following error message: "Fatal error: Uncaught Error: Call to an undefined function count People() in C:\OpenServer\domain\vpohodenot\feedback.php:253". Despite the assertion that the function exists, there seems to be an issue. What could it be?

Functions can be used without prior definition, except in cases where they are conditionally defined, as seen in the two examples.
When a function is defined based on some condition, such as those shown in the examples, the description of the function must be processed before it is called.

PHP functions and classes can be accessed globally, regardless of whether they were defined inside or outside of a function.

Function overloading is not supported in PHP, and it is also impossible to override or delete a previously declared function.

The notice level errors are turned off, which is not recommended. The message "nothing was found" appears because the countPeople($result) function is called before querying the database and the $result variable is undefined.

Additionally, it's not ideal to have any HTML output inside a function, as it may create issues if the layout becomes more complex. Instead, forming an array of data and substituting it into the template is better. It's also possible to move functions to a separate file and include them.

In this case, for a simple search and to retrieve data from the database, using the GET method instead of POST is recommended.

How to solve error when it is not defined properly?
software development company

The error message you've provided indicates that the PHP script is unable to find the `countPeople()` function, which is being called on line 253 of the `feedback.php` file.

First, let's address the assertion that the function exists. It's possible that the function is defined elsewhere in the codebase, but the current file is unable to access it. This could be due to several reasons:

1. Scope and Visibility: Ensure that the `countPeople()` function is defined within the appropriate scope and visibility. If the function is defined within a class or namespace, you'll need to either call it using the correct scope resolution operator (e.g., `ClassName::countPeople()`) or import the class or namespace at the top of the `feedback.php` file.

2. Function Naming: Double-check the function name to ensure that it is spelled correctly and matches the way it's being called in the code. PHP is case-sensitive, so `countPeople()` and `CountPeople()` are considered different functions.

3. Function Signature: Verify that the function signature (the number and type of parameters) matches the way it's being called in the code. If the function expects a certain number or type of arguments, but they're not being passed correctly, the function call will fail.

4. Function Inclusion: Ensure that the file containing the `countPeople()` function definition is being properly included or required in the `feedback.php` file. Check the file paths and make sure the include or require statement is located before the function is being called.

5. Autoloading: If you're using an autoloader to load classes and functions, make sure the `countPeople()` function is being properly registered with the autoloader. Verify the autoloader configuration and ensure that the function can be located by the autoloader.

6. Unexpected Behavior: It's also possible that the `countPeople()` function is being defined, but it's exhibiting unexpected behavior or returning an unexpected value, leading to the "undefined function" error. In this case, you may need to step through the function's implementation and debug the issue.

To troubleshoot this problem, I'd recommend the following steps:

1. Carefully review the code in the `feedback.php` file and the file(s) where the `countPeople()` function is defined, checking for the issues mentioned above.
2. Add error reporting and debugging statements to the code to help identify the root cause of the problem. This can include using `var_dump()` or `print_r()` to inspect variable values, or adding `echo` statements to trace the execution flow.
3. If the function is defined in a separate file, try including or requiring that file directly in the `feedback.php` file to ensure that the function is available.
4. Consider using a debugger, such as the one provided by your IDE or a tool like XDebug, to step through the code and identify the exact point where the issue is occurring.
5. If you're still unable to resolve the issue, you may need to provide more context, such as the full codebase or a minimal reproducible example, so that I can further assist you in diagnosing and resolving the problem.