How can PHP developers leverage the PHP manual and other resources to improve their understanding of built-in functions and language features for string manipulation?

PHP developers can leverage the PHP manual and other resources by referring to the official PHP documentation for detailed explanations, examples, and usage of built-in functions and language features for string manipulation. By studying the documentation, developers can gain a deeper understanding of how to effectively use these functions in their code.

// Example of using the PHP manual to improve understanding of string manipulation functions
$string = "Hello, World!";
$substring = substr($string, 0, 5); // Returns "Hello"
echo $substring;