lower case;upper case

1

The array_change_key_case () function returns an array with all array KEYS in lower case or upper case .

函数的作用是：返回字符串键名全为小写或大写的数组说明。
2

Trees in all shapes and sizes Small letters are sometimes called lower case and large letters upper case .

大大小小形状各异的树小写字母有时被称作小写字母盘，大写字母为大写字母盘。
3

Small letters are sometimes called lower case and large letters upper case . Mixing : Having more than one typeface , style or size in one line of text .

字体混合：在一字行内，有多过一种字体、字款和字大小的情况。