How can the use of microtime() help in identifying bottlenecks in PHP scripts?

Using microtime() in PHP can help in identifying bottlenecks by measuring the execution time of specific parts of your script. By adding microtime() before and after a particular code block, you can calculate the time taken to execute that block. This allows you to pinpoint which parts of your script are taking the most time to execute and optimize them accordingly.

$start_time = microtime(true);

// Code block to measure

$end_time = microtime(true);
$execution_time = ($end_time - $start_time);
echo "Execution time: " . $execution_time . " seconds";