PHPExcel循环读取excel,列数超过z,比较出有关问题

PHPExcel循环读取excel,列数超过z,比较出问题

PHP code

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for($currentColumn= 'A';$currentColumn

------解决方案--------------------
for($i='A'; $i!='AP'; $i++) echo $i;

ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAFAGAHAIAJAKALAMANAO