How Can I Measure PHP Script Execution Time Within the Script Itself?

Determining Script Execution Time in PHP

In PHP, the max_execution_time limit mandates that the amount of CPU time utilized by a script be tracked. This article explores if there's a mechanism for accessing this information within the script itself to facilitate logging of PHP CPU usage in test environments.

For Linux systems, a simple method exists to calculate the elapsed wall-clock time (rather than CPU time) of a script:

// Determine the script's starting time (in microseconds)
$time_start = microtime(true);

// Execute the desired script
// (Replace this block with the code you want to track)
for($i=0; $i<1000; $i++){
 // Perform actions
}

// Determine the script's end time (in microseconds)
$time_end = microtime(true);

// Calculate the execution time (default unit: seconds)
$execution_time = $time_end - $time_start;

// Output the execution time in minutes
echo '<b>

Note that this method includes non-PHP execution time, such as waiting for database or disk responses, which is not considered in max_execution_time calculations.

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