High resolution timing in PHP

High resolution timing is frequently used in PHP to delay, postpone or filter various actions. The example below shows how to do so.

Simple example with usleep function in PHP

<?php
    usleep(10); // 10 microsecond
    $time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"]; // server time
    echo "Sleep time is: " . $time . " seconds.";
?>

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