In PHP, how do I index strings for production systems?

In PHP, indexing strings is crucial for production systems to efficiently access and manipulate string data. Below is an example of how to index strings utilizing the PHP programming language.


        <?php
        // Example of indexing a string in PHP
        $string = "Hello, World!";
        // Access the first character
        $firstCharacter = $string[0]; // H
        // Access the last character
        $lastCharacter = $string[strlen($string) - 1]; // !
        
        echo "First Character: " . $firstCharacter . "<br>";
        echo "Last Character: " . $lastCharacter;
        ?>