php生成excel中的列序号

/**
* 用php代码生成excel或csv文件中的序列号
*/
public function loop(){
$loop = 0;
$charnum = 65;
for(; $loop < 150; $loop++){
$quotient = intval($loop / 26);
$remainder = $loop % 26;
$f = $quotient>0? chr($charnum+$quotient-1) : '';
$s = $remainder>=0? chr($charnum+$remainder) : '';
echo $loop .' | '. $quotient .' | '. $remainder .' | '. $f . $s ."
";
} // bbs.it-home.org
}