How can the PHP manual be utilized effectively to address coding issues?

Issue: To address coding issues effectively using the PHP manual, it is essential to first identify the problem within the code. Once the issue is understood, refer to the PHP manual to find relevant functions, methods, or syntax that can help resolve the problem. By carefully reading the documentation and examples provided in the manual, developers can implement the necessary changes to fix the coding issue. Example PHP code snippet:

// Issue: Need to convert a string to uppercase
$string = "hello world";
$uppercase_string = strtoupper($string);
echo $uppercase_string;