php 计算多长时间之前的函数示例

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<?php 
/**
 * php计算多长时间之前的函数
 *
 * @param 
 * @author php教程 www.idcnote.com
 **/
function prettyDate($date){ 
	$time = strtotime($date); 
	$now = time(); 
	$ago = $now - $time; 
	if($ago < 60){ 
		$when = round($ago); 
		$s = ($when == 1)?"second":"seconds"; 
		return "$when $s ago"; 
	}elseif($ago < 3600){ 
		$when = round($ago / 60); 
		$m = ($when == 1)?"minute":"minutes"; 
		return "$when $m ago"; 
	}elseif($ago >= 3600 && $ago < 86400){ 
		$when = round($ago / 60 / 60); 
		$h = ($when == 1)?"hour":"hours"; 
		return "$when $h ago"; 
	}elseif($ago >= 86400 && $ago < 2629743.83){ 
		$when = round($ago / 60 / 60 / 24); 
		$d = ($when == 1)?"day":"days"; 
		return "$when $d ago"; 
	}elseif($ago >= 2629743.83 && $ago < 31556926){ 
		$when = round($ago / 60 / 60 / 24 / 30.4375); 
		$m = ($when == 1)?"month":"months"; 
		return "$when $m ago"; 
	}else{ 
		$when = round($ago / 60 / 60 / 24 / 365); 
		$y = ($when == 1)?"year":"years"; 
		return "$when $y ago"; 
	} 
}
echo prettyDate("2012-07-22 12:23:45")."<br />"; 
echo prettyDate("2010-11-12 22:25:45")."<br />"; 
echo prettyDate("2012-01-01 01:00:00")."<br />"; 
echo prettyDate("2001-05-30 00:00:00")."<br />";


/***   来自php教程（www.idcnote.com）   ***/

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