PHP：常用的方法

1. 数组的键值倒序

    array_reverse($list,true);

倒序前：
    array (size=3)
      0 => 
        array (size=2)
          "id" => string "1" (length=1)
          "name" => string "abc" (length=3)
      1 => 
        array (size=2)
          "id" => string "2" (length=1)
          "name" => string "def" (length=3)
      2 => 
        array (size=2)
          "id" => string "3" (length=1)
          "name" => string "ghi" (length=3)
倒序后：
    array (size=3)
      2 => 
        array (size=2)
          "id" => string "3" (length=1)
          "name" => string "ghi" (length=3)
      1 => 
        array (size=2)
          "id" => string "2" (length=1)
          "name" => string "def" (length=3)
      0 => 
        array (size=2)
          "id" => string "1" (length=1)
          "name" => string "abc" (length=3)