php将日期格式转换成xx天前的格式

// convert a date into a string that tells how long ago // that date was.... eg: 2 days ago, 3 minutes ago. function ago($d) { $c = getdate(); $p = array('year', 'mon', 'mday', 'hours', 'minutes', 'seconds'); $display = array('year', 'month', 'day', 'hour', 'minute', 'second'); $factor = array(0, 12, 30, 24, 60, 60); $d = datetoarr($d); for ($w = 0; $w < 6; $w++) { if ($w > 0) { $c[$p[$w]] += $c[$p[$w-1]] * $factor[$w]; $d[$p[$w]] += $d[$p[$w-1]] * $factor[$w]; } if ($c[$p[$w]] - $d[$p[$w]] > 1) { return ($c[$p[$w]] - $d[$p[$w]]).' '.$display[$w].'s ago'; } } return ''; } // you can replace this if need be. // This converts my dates returned from a mysql date string // into an array object similar to that returned by getdate(). function datetoarr($d) { preg_match("/([0-9]{4})(\\-)([0-9]{2})(\\-)([0-9]{2})([0-9]{2})(\\:)([0-9]{2})(\\:)([0-9]{2})/",$d,$matches); return array( 'seconds' => $matches[10], 'minutes' => $matches[8], 'hours' => $matches[6], 'mday' => $matches[5], 'mon' => $matches[3], 'year' => $matches[1], ); }