PHP | hrtime() Function Last Updated : 29 Aug, 2019 Comments Improve Suggest changes Like Article Like Report The hrtime() function is an inbuilt function in PHP which returns the high-resolution time of the system. Syntax: mixed hrtime( bool $is_num_return ); Parameter: This function accepts a single parameter as mentioned above and described below: $is_num_return: It is optional parameter of Boolean type. It specifies whether it return as a single number or array. If it set to TRUE then it returns as number or as an array of integers in case of FALSE. Default value is FALSE. Return Value: This function returns the nanoseconds or an array of integers. Note: This function is available for PHP 7.3.0 and newer version. Below programs illustrate the hrtime() function in PHP: Program 1: This program sets $is_num_return to TRUE. php <?php print_r(hrtime(TRUE)); ?> Output: 149632499993800 Program 2: This program does not set $is_num_return value. It means it takes the default value. php <?php print_r(hrtime()); ?> Output: Array ( [0] => 150389 [1] => 914027500 ) Reference: https://www.php.net/manual/en/function.hrtime.php Comment More infoAdvertise with us Next Article PHP | hrtime() Function G gekcho Follow Improve Article Tags : Web Technologies PHP PHP-function Similar Reads PHP | mktime() Function The mktime() function is an inbuilt function in PHP which is used to return the Unix timestamp for a date. The timestamp returns a long integer containing the number of seconds between the Unix Epoch (January 1, 1970, 00:00:00 GMT) and the time specified. The hour, minute, second, month, day and yea 2 min read PHP | microtime() Function The microtime() function is an inbuilt function in PHP which is used to return the current Unix timestamp with microseconds. The $get_as_float is sent as a parameter to the microtime() function and it returns the string microsec sec by default. Syntax: microtime( $get_as_float ) Parameters: This fun 2 min read PHP | gmstrftime() Function The gmstrftime() function is an inbuilt function in PHP which is used to format a GMT/UTC time/date according to local settings. The gmstrftime() function in PHP behaves in the same way as strftime() except that the time returned by the gmstrftime() function is Greenwich Mean Time (GMT). The $format 2 min read PHP | gmmktime() Function The gmmktime() function is an inbuilt function in PHP which is used to return the Unix timestamp for a GMT date. The $hour, $minute, $second, $month, $day, $year and $is_dst are sent as parameters to the gmmktime() function and it returns an integer Unix timestamp on success or False on error. Synta 2 min read PHP | localtime() Function The localtime() function is an inbuilt function in PHP which is used to return the local time. The array returned by the localtime() function is similar to the structure returned by the C function call. The $timestamp and $is_associative are sent as parameters to the localtime() function and it retu 2 min read Like