Accurate way to measure execution times of php scripts

Question

I want to know how many milliseconds a PHP for-loop takes to execute.

I know the structure of a generic algorithm, but no idea how to implement it in PHP:

Begin init1 = timer(); // where timer() is the amount of milliseconds from midnight the loop begin some code the loop end total = timer() - init1; End 

Answer 1

You can use the microtime function for this. From the documentation:

microtime — Return current Unix timestamp with microseconds

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If get_as_float is set to TRUE, then microtime() returns a float, which represents the current time in seconds since the Unix epoch accurate to the nearest microsecond.

Example usage:

$start = microtime(true); while (...) {  } $time_elapsed_secs = microtime(true) - $start;