怎样用for循环使变量名称递增？

$insertSQL="INSERT INTO yx_tab2_m (id,
qj_date,
Customer_num,
Customer_name,
kanyang,
print,
xiupian,
tiaose,
tx_tiaose,
design,
check_m,
other)  
VALUES('$table_id',
'$_POST[qj_date1]',
'$_POST[Customer_num1]',
'$_POST[Customer_name1]',
'$_POST[kanyang1]',
'$_POST[print1]',
'$_POST[xiupian1]',
'$_POST[tiaose1]',
'$_POST[tx_tiaose1]',
'$_POST[design1]',
'$_POST[check1]',
'$_POST[other1]')";

for($i=0;$i<100;$i++){
echo $_POST[&#39;qj_date&#39;.$i];
}