<?php 
    $StartMonth   = '2014-08-12'; //开始日期
    $EndMonth     = '2015-10-20'; //结束日期
    $ToStartMonth = strtotime( $StartMonth ); //转换一下
    $ToEndMonth   = strtotime( $EndMonth ); //一样转换一下
    $i            = false; //开始标示
    while( $ToStartMonth < $ToEndMonth ) {
      $NewMonth = !$i ? date('Y-m', strtotime('+0 Month', $ToStartMonth)) : date('Y-m', strtotime('+1 Month', $ToStartMonth));
      $ToStartMonth = strtotime( $NewMonth );
      $i = true;
      echo $NewMonth, '';
    }
    ?>