GETTIMEOFDAY(3) 1 GETTIMEOFDAY(3)gettimeofday - Get current timeSYNOPSIS
mixed gettimeofday ([bool $return_float = false])
DESCRIPTION
This is an interface to gettimeofday(2). It returns an associative array containing the data returned from the system call.
PARAMETERS
o $return_float
- When set to TRUE, a float instead of an array is returned.
RETURN VALUES
By default an array is returned. If $return_float is set, then a float is returned.
Array keys:
o "sec" - seconds since the Unix Epoch
o "usec" - microseconds
o "minuteswest" - minutes west of Greenwich
o "dsttime" - type of dst correction
CHANGELOG
+--------+-----------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+-----------------------------------------+
| 5.1.0 | |
| | |
| | The $return_float parameter was added. |
| | |
+--------+-----------------------------------------+
EXAMPLES
Example #1
gettimeofday(3) example
<?php
print_r(gettimeofday());
echo gettimeofday(true);
?>
The above example will output something similar to:
Array
(
[sec] => 1073504408
[usec] => 238215
[minuteswest] => 0
[dsttime] => 1
)
1073504408.23910
PHP Documentation Group GETTIMEOFDAY(3)
Check Out this Related Man Page
GETTIMEOFDAY(2) BSD System Calls Manual GETTIMEOFDAY(2)NAME
gettimeofday, settimeofday -- get/set date and time
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/time.h>
int
gettimeofday(struct timeval *tp, struct timezone *tzp);
int
settimeofday(const struct timeval *tp, const struct timezone *tzp);
DESCRIPTION
Note: timezone is no longer used; this information is kept outside the kernel.
The system's notion of the current Greenwich time and the current time zone is obtained with the gettimeofday() system call, and set with the
settimeofday() system call. The time is expressed in seconds and microseconds since midnight (0 hour), January 1, 1970. The resolution of
the system clock is hardware dependent, and the time may be updated continuously or in ``ticks''. If tp or tzp is NULL, the associated time
information will not be returned or set.
The structures pointed to by tp and tzp are defined in <sys/time.h> as:
struct timeval {
time_t tv_sec; /* seconds */
suseconds_t tv_usec; /* and microseconds */
};
struct timezone {
int tz_minuteswest; /* minutes west of Greenwich */
int tz_dsttime; /* type of dst correction */
};
The timezone structure indicates the local time zone (measured in minutes of time westward from Greenwich), and a flag that, if nonzero,
indicates that Daylight Saving time applies locally during the appropriate part of the year.
Only the super-user may set the time of day or time zone. If the system is running at securelevel >= 2 (see init(8)), the time may only be
advanced or retarded by a maximum of one second. This limitation is imposed to prevent a malicious super-user from setting arbitrary time
stamps on files. The system time can be adjusted backwards without restriction using the adjtime(2) system call even when the system is
secure.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
The following error codes may be set in errno:
[EFAULT] An argument address referenced invalid memory.
[EPERM] A user other than the super-user attempted to set the time.
SEE ALSO date(1), adjtime(2), clock_gettime(2), ctime(3), timeradd(3), clocks(7), timed(8)HISTORY
The gettimeofday() system call appeared in 4.2BSD.
BSD May 26, 1995 BSD