What are the potential pitfalls of using microtime() in PHP, and how can developers ensure accurate time measurements in their code?

Using microtime() in PHP can be inaccurate due to system clock changes or variations in system load. To ensure accurate time measurements, developers can use the hrtime() function introduced in PHP 7.3, which provides a high-resolution timer that is not subject to system clock changes. 

$start = hrtime(true);

// Code to measure time for

$end = hrtime(true);
$elapsed = ($end - $start) / 1e+6; // Convert nanoseconds to milliseconds
echo "Elapsed time: $elapsed milliseconds";

Keywords

microtime time measurements accuracy precision PHP errors

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