How can PHP documentation help in resolving issues related to string manipulation?

Issue: When working with string manipulation in PHP, it is common to encounter problems such as incorrect output, unexpected behavior, or errors in the code. To resolve these issues, referring to the PHP documentation can provide clarity on the correct syntax, functions, and methods to use for effective string manipulation. Code snippet:

// Example of using PHP documentation for string manipulation
$string = "Hello, World!";
$newString = strtoupper($string); // Convert the string to uppercase
echo $newString; // Output: HELLO, WORLD!