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time_sleep_until(3) [php man page]

TIME_SLEEP_UNTIL(3)							 1						       TIME_SLEEP_UNTIL(3)

time_sleep_until - Make the script sleep until the specified time

bool time_sleep_until (float $timestamp) DESCRIPTION
Makes the script sleep until the specified $timestamp. PARAMETERS
o $timestamp - The timestamp when the script should wake. RETURN VALUES
Returns TRUE on success or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | This function is now available on Windows plat- | | | forms. | | | | +--------+---------------------------------------------------+ ERRORS
/EXCEPTIONS If the specified $timestamp is in the past, this function will generate a E_WARNING. EXAMPLES
Example #1 A time_sleep_until(3) example <?php //returns false and generates a warning var_dump(time_sleep_until(time()-1)); // may only work on faster computers, will sleep up to 0.2 seconds var_dump(time_sleep_until(microtime(true)+0.2)); ?> NOTES
Note All signals will be delivered after the script wakes up. SEE ALSO
sleep(3), usleep(3), time_nanosleep(3), set_time_limit(3). PHP Documentation Group TIME_SLEEP_UNTIL(3)

Check Out this Related Man Page

MICROTIME(3)								 1							      MICROTIME(3)

microtime - Return current Unix timestamp with microseconds

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)
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