How can the use of the sleep function affect the performance of a PHP script?

Using the sleep function in a PHP script can cause delays in the execution of the script, which can impact performance, especially in scenarios where the script needs to run quickly or handle multiple requests simultaneously. To mitigate this issue, consider using asynchronous programming techniques or optimizing the script to reduce the reliance on sleep.

// Example of using asynchronous programming with promises to replace sleep function
$promises = [];
$promises[] = new React\Promise\Promise(function ($resolve, $reject) {
    // Perform asynchronous task here
    $resolve($result);
});

// Wait for all promises to resolve
React\Promise\all($promises)->then(function ($results) {
    // Handle results
});