PHP - Function microtime()


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Syntax

mixed microtime ( [bool $get_as_float] );

Definition and Usage

This function returns the current Unix timestamp with microseconds. This function is only available on operating systems that support the gettimeofday() system call.

Parameters

Parameter Description
get_as_float

Optional. When called without the optional argument, this function returns the string "msec sec" where sec is the current time measured in the number of seconds since the Unix Epoch (0:00:00 January 1, 1970 GMT), and msec is the microseconds part.

If the optional get_as_float is set to TRUE then a float (in seconds) is returned.

Return Value

Explained in Definition.

Example

Following is the usage of this function −

<?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\n";
?>

This will produce the following result −

Did nothing in 0.0018141269683838 seconds

php_function_reference.htm

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