生成excel 列序号

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 ."
";
			
			
		}
	}