excel的列生成算法

echo '<pre>';
$i = 1;
while($i < 703){

$char1 = floor($i / 26);
$char2 = $i % 26;
if($i % 26 == 0)$char1--;
if($i > 1 && $i % 26 == 1)     echo '<br/>';
if($char2 == 0) $char2 = 26;

if($i <= 26){
echo ' '.chr(64 + $char2). ' ';
}else{
echo chr(64 + $char1) . chr(64 + $char2) . ' ';
}

$i++;
}
echo '</pre>';

/**
* 根据当前列号,返回列字符
* @param int $i
* @return string
*/
function get_excel_row_name($i){

$char1 = floor($i / 26);
$char2 = $i % 26;
if($i % 26 == 0) $char1--;
if($char2 == 0) $char2 = 26;

if($i <= 26){
return chr(64 + $char2);
}else{
return chr(64 + $char1) . chr(64 + $char2);
}

}