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 function accepts single parameter $get_as_float which is optional. If $get_as_float is set to TRUE then it specify that the function should return a float, instead of a string.

Return Value: It returns the string microsec sec by default, where sec is the number of seconds since the Unix Epoch (0:00:00 January 1, 1970, GMT), and microsec is the microseconds part. If the $get_as_float parameter is set to TRUE, it returns a float representing the current time in seconds since the Unix epoch accurate to the nearest microsecond.

Exceptions: The microtime() function is only available on operating systems that support the gettimeofday() system call.

Below programs illustrate the microtime() function in PHP:

Program 1:

<?php

// Displaying the micro time as a string
echo ("The micro time is :");
echo(microtime());
?>

Output:

The micro time is :0.51423700 1535452933

Program 2:

<?php

// Displaying the micro time as a float type
echo ("The micro time is :");
echo(microtime(true));
?>

Output:

The micro time is :1535452935.2589

Reference: http://php.net/manual/en/function.microtime.php