[PHP日期时间函数]⑤--microtime()、getdate()、gettimeofday()、checkdate()

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microtime()

echo microtime() . "
";//0.52176800 1503372062

//保留浮点数
echo microtime(true) . "
";//1503372110.551

$start = microtime(true);
for ($i = 0; $i <= 1000000; $i++) {
    $arr[] = $i;
}
$end = microtime(true);
echo '程序执行时间为:' . round($end - $start, 4);//程序执行时间为:0.2268

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getdate()

得到日期时间相关信息

gettimeofday()

得到当前的日期信息

checkdate()

验证日期的合法性

 int 8
 * 'minutes' => int 29
 * 'hours' => int 3
 * 'mday' => int 22
 * 'wday' => int 2
 * 'mon' => int 8
 * 'year' => int 2017
 * 'yday' => int 233
 * 'weekday' => string 'Tuesday' (length=7)
 * 'month' => string 'August' (length=6)
 * 0 => int 1503372548
 */

var_dump(gettimeofday());
/**
 * array
 * 'sec' => int 1503372590
 * 'usec' => int 915509
 * 'minuteswest' => int 0
 * 'dsttime' => int 0
 */

var_dump(checkdate(8, 12, 2016));//boolean true

var_dump(checkdate(2, 29, 2017));//boolean false


?>

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