php 获取时间详解

<?php  
/** 
 * php 获取时间(今天,昨天,三天内,本周,上周,本月,三年内,半年内,一年内,三年内) 
 * 
 * author:ihelloworld2010@gmail.com 
 * date:2012-06-28 16:00:01 
 */  
  
$q = $_GET['q'] ? intval($_GET['q']) : 0;  
  
$text = '';  
$now = time();  
  
if ($q === 1) {// 今天  
    $text = '今天';  
    $beginTime = date('Y-m-d 00:00:00', $now);  
    $endTime = date('Y-m-d 23:59:59', $now);  
} elseif ($q === 2) {// 昨天  
    $text = '昨天';  
    $time = strtotime('-1 day', $now);  
    $beginTime = date('Y-m-d 00:00:00', $time);  
    $endTime = date('Y-m-d 23:59:59', $now);  
} elseif ($q === 3) {// 三天内  
    $text = '三天内';  
    $time = strtotime('-2 day', $now);  
    $beginTime = date('Y-m-d 00:00:00', $time);  
    $endTime = date('Y-m-d 23:59:59', $now);  
} elseif ($q === 4) {// 本周  
    $text = '本周';  
    $time = '1' == date('w') ? strtotime('Monday', $now) : strtotime('last Monday', $now);  
    $beginTime = date('Y-m-d 00:00:00', $time);  
    $endTime = date('Y-m-d 23:59:59', strtotime('Sunday', $now));  
} elseif ($q === 5) {// 上周  
    $text = '上周';  
    // 本周一  
    $thisMonday = '1' == date('w') ? strtotime('Monday', $now) : strtotime('last Monday', $now);  
    // 上周一  
    $lastMonday = strtotime('-7 days', $thisMonday);  
    $beginTime = date('Y-m-d 00:00:00', $lastMonday);  
    $endTime = date('Y-m-d 23:59:59', strtotime('last sunday', $now));  
} elseif ($q === 6) {// 本月  
    $text = '本月';  
    $beginTime = date('Y-m-d 00:00:00', mktime(0, 0, 0, date('m', $now), '1', date('Y', $now)));  
    $endTime = date('Y-m-d 23:39:59', mktime(0, 0, 0, date('m', $now), date('t', $now), date('Y', $now)));  
} elseif ($q === 7) {// 三月内  
    $text = '三月内';  
    $time = strtotime('-2 month', $now);  
    $beginTime = date('Y-m-d 00:00:00', mktime(0, 0,0, date('m', $time), 1, date('Y', $time)));  
    $endTime = date('Y-m-d 23:39:59', mktime(0, 0, 0, date('m', $now), date('t', $now), date('Y', $now)));  
} elseif ($q === 8) {// 半年内  
    $text = '半年内';  
    $time = strtotime('-5 month', $now);  
    $beginTime = date('Y-m-d 00:00:00', mktime(0, 0,0, date('m', $time), 1, date('Y', $time)));  
    $endTime = date('Y-m-d 23:39:59', mktime(0, 0, 0, date('m', $now), date('t', $now), date('Y', $now)));  
}  elseif ($q === 9) {// 一年内  
    $text = '一年内';  
    $beginTime = date('Y-m-d 00:00:00', mktime(0, 0,0, 1, 1, date('Y', $now)));  
    $endTime = date('Y-m-d 23:39:59', mktime(0, 0, 0, 12, 31, date('Y', $now)));  
} elseif ($q === 10) {// 三年内  
    $text = '三年内';  
    $time = strtotime('-2 year', $now);  
    $beginTime = date('Y-m-d 00:00:00', mktime(0, 0, 0, 1, 1, date('Y', $time)));  
    $endTime = date('Y-m-d 23:39:59', mktime(0, 0, 0, 12, 31, date('Y')));  
}  
  
echo $text;  
echo '<br />';  
echo $beginTime;  
echo '<br />';  
echo $endTime;