How can PHP developers optimize their code when working with string manipulation functions like str_word_count() and substr_count()?

When working with string manipulation functions like str_word_count() and substr_count(), PHP developers can optimize their code by minimizing the number of function calls and avoiding unnecessary string manipulations. One way to achieve this is by storing the result of the function calls in variables and then using those variables in subsequent operations, rather than calling the functions multiple times.

// Example of optimizing code with str_word_count() and substr_count()

$string = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
$wordCount = str_word_count($string);
$subCount = substr_count($string, 'o');

echo "Number of words: " . $wordCount . "<br>";
echo "Number of 'o' occurrences: " . $subCount;