How the execution time of the PHP script is calculated in segments

Many times we need to calculate the execution time of the PHP script to learn about the efficiency of the script, and so on. For example, there is a large section of PHP script, we need a fragment to get the script execution time method. First introduce the function to be used:

Timer function Runtime ($mode = 0) {static $t;     if (! $mode) {$t = Microtime (); return;     }     $t 1 = microtime ();     List ($m 0, $s 0) = Split ("", $t);    List ($m 1, $s 1) = Split ("", $t 1);    

　　

Microtime () function

The Microtime () function returns the current Unix timestamp and the number of microseconds.

Microtime (get_as_float), parameter get_as_float, if the get_as_float parameter is given and its value is equivalent to TRUE, the function returns a floating-point number.

<?phpecho (Microtime ());? >

　　

If called without optional arguments, this function returns a string in the format "msec sec", where the SEC is the number of seconds since the Unix era (0:00:00 January 1, 1970 GMT) and msec is the microsecond portion. The two parts of a string are returned in seconds.

Program output:

1	0.25139300 1138197510

Now it's time to compute the timephased execution of the PHP script.

How the execution time of the PHP script is calculated in segments