microtime

(PHP 4, PHP 5, PHP 7)

microtime — 锟斤拷锟截碉拷前 Unix 时锟斤拷锟斤拷锟轿拷锟斤拷锟�

说锟斤拷

microtime ([ bool $get_as_float ] ) : mixed

microtime() 锟斤拷前 Unix 时锟斤拷锟斤拷约锟轿拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街э拷锟� gettimeofday() 系统锟斤拷锟矫的诧拷锟斤拷系统锟铰匡拷锟矫★拷

锟斤拷锟斤拷锟斤拷锟绞憋拷锟斤拷锟斤拷锟窖★拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟� "msec sec" 锟侥革拷式锟斤拷锟斤拷一锟斤拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷 sec 锟斤拷锟斤拷 Unix 锟斤拷元锟斤拷0:00:00 January 1, 1970 GMT锟斤拷锟斤拷锟斤拷锟节碉拷锟斤拷锟斤拷锟斤拷msec 锟斤拷微锟诫部锟街★拷锟街凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街讹拷锟斤拷锟斤拷锟斤拷为锟斤拷位锟斤拷锟截的★拷

锟斤拷锟斤拷锟斤拷锟斤拷锟� get_as_float 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷值锟饺硷拷锟斤拷 TRUE锟斤拷microtime() 锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

Note: get_as_float 锟斤拷锟斤拷锟斤拷 PHP 5.0.0 锟铰加的★拷

Example #1 锟斤拷 microtime() 锟皆脚憋拷锟斤拷锟斤拷锟叫硷拷时


<?php
/**
 * Simple function to replicate PHP 5 behaviour
 */
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

$time_start = microtime_float();

// Sleep for a while
usleep(100);

$time_end = microtime_float();
$time = $time_end - $time_start;

echo "Did nothing in $time seconds\n";
?>

锟轿硷拷 time()锟斤拷