方法1：
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$from_unix_time = mktime(0, 0, 0, $month, $day, $year); $day_before = strtotime("yesterday", $from_unix_time); $formatted = date('Y-m-d', $day_before); |
方法2：
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$date = '2012-11-08'; $day_before = date( 'Y-m-d', strtotime( $date . ' -1 day' ) ); |
方法3：
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$days_ago = date('Y-m-d', strtotime('-5 days', strtotime('2008-12-02'))); |