php 时间转换 （几分钟前、几小时前、几天前）

/**
 * 判断今天昨天前天
 *
 * @param [type] $targetTime
 * @return void
 */
function get_time($targetTime)
{
    // 今天最大时间
    $todayLast=strtotime(date('Y-m-d 23:59:59'));
    $agoTimeTrue = time() - $targetTime;
    $agoTime = $todayLast - $targetTime;
    $agoDay = floor($agoTime / 86400);

    if ($agoTimeTrue < 60) {
        $result = '刚刚';
    } elseif ($agoTimeTrue < 3600) {
        $result = (ceil($agoTimeTrue / 60)) . '分钟前';
    } elseif ($agoTimeTrue < 3600 * 12) {
        $result = (ceil($agoTimeTrue / 3600)) . '小时前';
    } elseif ($agoDay == 0) {
        $result = '今天 ' . date('H:i', $targetTime);
    } elseif ($agoDay == 1) {
        $result = '昨天 ' . date('H:i', $targetTime);
    } elseif ($agoDay == 2) {
        $result = '前天 ' . date('H:i', $targetTime);
    } elseif ($agoDay > 2 && $agoDay < 16) {
        $result = $agoDay . '天前 ' . date('H:i', $targetTime);
    } else {
        $format = date('Y') != date('Y', $targetTime) ? "Y-m-d H:i" : "m-d H:i";
        $result = date($format, $targetTime);
    }
    
    return $result;
}