php function Microtime () Usage and description _php tutorial

Source: Internet
Author: User
Definition and usage
The PHP function Microtime () returns the current Unix timestamp and the number of microseconds.
php function Microtime () syntax
Microtime (Get_as_float)
php function microtime () parameter and description
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.
Description
PHP functions Microtime () are only available under operating systems that support Gettimeofday () system calls.
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.
Example
Copy CodeThe code is as follows:
Echo (Microtime ()); 0.25139300 1138197510

The PHP function Microtime () is typically used as follows:
Copy CodeThe code is as follows:
$mtime =explode (' ', Microtime ());
$startTime = $mtime [1]+ $mtime [0];
Echo $startTime; 1385976275.33

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