列标字符转化
数字转字符
var_dump(\Vtiful\Kernel\Excel::stringFromColumnIndex(0)); // A
var_dump(\Vtiful\Kernel\Excel::stringFromColumnIndex(28)); // AC
字符转数字
var_dump(\Vtiful\Kernel\Excel::columnIndexFromString('A')); // 0
var_dump(\Vtiful\Kernel\Excel::columnIndexFromString('AC')); // 28
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