php 怎么获取几分钟前

function tranTime($time) { 
    $rtime = date("m-d H:i",$time); 
    $htime = date("H:i",$time); 
      
    $time = time() - $time; 
  
    if ($time < 60) { 
        $str = '刚刚'; 
    } 
    elseif ($time < 60 * 60) { 
        $min = floor($time/60); 
        $str = $min.'分钟前'; 
    } 
    elseif ($time < 60 * 60 * 24) { 
        $h = floor($time/(60*60)); 
        $str = $h.'小时前 '.$htime; 
    } 
    elseif ($time < 60 * 60 * 24 * 3) { 
        $d = floor($time/(60*60*24)); 
        if($d==1) 
           $str = '昨天 '.$rtime; 
        else 
           $str = '前天 '.$rtime; 
    } 
    else { 
        $str = $rtime; 
    } 
    return $str; 
}

floor(number);