PHP how to calculate function execution Time _php tutorial

How PHP calculates a function's execution time

This article mainly introduced the PHP computation function execution Time method, takes the MD5 function encryption run time as an example to analyze the PHP computation function running time the skill, needs the friend can refer to the next

This example describes how PHP calculates the execution time of a function. Share to everyone for your reference. Specific as follows:

We can record the start and end time respectively before and after the program, the two time difference is the execution of the program.

The code is as follows:

$long _str = "This is a test to see how much time MD5 function takes to execute over this string";
Start timing from here
$start = Microtime (true);
function to test
$MD 5 = MD5 ($long _str);
$elapsed = Microtime (True)-$start;
echo "That took $elapsed seconds.\n";
?>

The results of the operation are as follows:

That took 7.1525573730469E-6 seconds.

I hope this article is helpful to everyone's PHP programming.

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