求助：關於php一段簡單代碼

php

這是php和mysql web開發書中一個例子，目的就是把檔案儲存的訂單資訊炸開，用表格顯示。我運行時為什麼只顯示表頭，沒有表格式資料呢。
orders.txt中就是訂單資訊，用Tab分隔的，已正確讀取到$orders中。貌似是後邊的for迴圈中有問題。

Bob's Auto Parts - Customer Orders

Bob's Auto Parts

Customer Orders

//Read the entire file
//Each order becomes an element in the array
$orders = file("./orders.txt");

//count the number of orders in the array$number_of_orders = count($orders);if($number_of_orders = 0) {    echo "
No orders pending. Please try again later.
";}echo "
   
    \n";echo "
    ";for($i = 0; $i < $number_of_orders; $i++) { //Split up each line $line = explode("\t", $orders[$i]); //keep only the number of items ordered $line[1] = intval($line[1]); $line[2] = intval($line[2]); $line[3] = intval($line[3]); //output each other echo "
     ";}echo "
    

     

      
Order Date
 
      
Tires
 
      
Oil
 
      
Spark plugs
 
      
Total
 
      
Address
 
     
 
      
".$line[0]."
 
      
".$line[1]."
 
      
".$line[2]."
 
      
".$line[3]."
 
      
".$line[4]."
 
      
".$line[5]."
 
     
   
";

?>

