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The Sleep Scripting Project 2.1-b24 (Default branch)
04-30-2008
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MICROTIME(3) 1 MICROTIME(3) microtime - Return current Unix timestamp with microseconds SYNOPSIS
mixed microtime ([bool $get_as_float = false]) DESCRIPTION
microtime(3) returns the current Unix timestamp with microseconds. This function is only available on operating systems that support the gettimeofday() system call. PARAMETERS
o $get_as_float - If used and set to TRUE, microtime(3) will return a float instead of a string, as described in the return values section below. RETURN VALUES
By default, microtime(3) returns a string in the form "msec sec", where sec is the number of seconds since the Unix epoch (0:00:00 January 1,1970 GMT), and msec measures microseconds that have elapsed since sec and is also expressed in seconds. If $get_as_float is set to TRUE, then microtime(3) returns a float, which represents the current time in seconds since the Unix epoch accurate to the nearest microsecond. EXAMPLES
Example #1 Timing script execution with microtime(3) <?php /** * Simple function to replicate PHP 5 behaviour */ function microtime_float() { list($usec, $sec) = explode(" ", microtime()); return ((float)$usec + (float)$sec); } $time_start = microtime_float(); // Sleep for a while usleep(100); $time_end = microtime_float(); $time = $time_end - $time_start; echo "Did nothing in $time seconds "; ?> Example #2 Timing script execution in PHP 5 <?php $time_start = microtime(true); // Sleep for a while usleep(100); $time_end = microtime(true); $time = $time_end - $time_start; echo "Did nothing in $time seconds "; ?> Example #3 microtime(3) and REQUEST_TIME_FLOAT (as of PHP 5.4.0) <?php // Randomize sleeping time usleep(mt_rand(100, 10000)); // As of PHP 5.4.0, REQUEST_TIME_FLOAT is available in the $_SERVER superglobal array. // It contains the timestamp of the start of the request with microsecond precision. $time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"]; echo "Did nothing in $time seconds "; ?> SEE ALSO
time(3). PHP Documentation Group MICROTIME(3)