10，PHP取月初月末日期

取月初月末

>>> $a = date('Y-m-01')
=> "2017-12-01"
>>> $b = date('t',strtotime($a))
=> "31"
>>> 

取上一个月

>>> strtotime('-1 months',strtotime('2017-01-02'))
=> 1480608000
>>> date('Y-m-d' ,1480608000)
=> "2016-12-02"

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