What are the common pitfalls to avoid when trying to implement a loop with a delay in a PHP script?

One common pitfall when implementing a loop with a delay in a PHP script is using the sleep() function, which can pause the entire script and cause performance issues. To avoid this, you can use the usleep() function to introduce a delay without halting the script execution. 

// Avoid using sleep() function to introduce delay in a loop
for ($i = 0; $i < 10; $i++) {
    sleep(1); // This will pause the entire script for 1 second
    echo $i . "\n";
}

// Instead, use usleep() function to introduce a delay
for ($i = 0; $i < 10; $i++) {
    usleep(1000000); // This will introduce a 1 second delay without pausing the script
    echo $i . "\n";
}

Keywords

PHP loop delay sleep timing

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