How can PHP developers optimize the performance of their code?

PHP developers can optimize the performance of their code by using efficient algorithms, minimizing database queries, caching data, and utilizing opcode caching. They can also improve performance by reducing unnecessary code execution, leveraging built-in PHP functions, and optimizing loops and conditionals.

// Example: Optimize loop performance by reducing unnecessary iterations
$limit = 1000;
for ($i = 0; $i < $limit; $i++) {
    // Code logic here
}