$line[1] = intval($line[1]); //这个这样写是什么意思?
<?php //create short variable name $DOCUMENT_ROOT = $_SERVER['DOCUMENT_ROOT'];?><html><head> <title>Bob's Auto Parts - Customer Orders</title></head><body><h1 id="Bob-s-nbsp-Auto-nbsp-Parts">Bob's Auto Parts</h1><h2 id="Customer-nbsp-Orders">Customer Orders</h2><?php //Read in the entire file. //Each order becomes an element in the array $orders= file("$DOCUMENT_ROOT/../orders/orders.txt"); // count the number of orders in the array $number_of_orders = count($orders); if ($number_of_orders == 0) { echo "<p><strong>No orders pending. Please try again later.</strong></p>"; } echo "<table border=\"1\">\n"; echo "<tr><th bgcolor=\"#CCCCFF\">Order Date</th> <th bgcolor=\"#CCCCFF\">Tires</th> <th bgcolor=\"#CCCCFF\">Oil</th> <th bgcolor=\"#CCCCFF\">Spark Plugs</th> <th bgcolor=\"#CCCCFF\">Total</th> <th bgcolor=\"#CCCCFF\">Address</th> <tr>"; for ($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 order echo "<tr> <td>".$line[0]."</td> <td align=\"right\">".$line[1]."</td> <td align=\"right\">".$line[2]."</td> <td align=\"right\">".$line[3]."</td> <td align=\"right\">".$line[4]."</td> <td>".$line[5]."</td> </tr>"; } echo "</table>";?></body></html>$line[1] = intval($line[1]); //这个这样写是什么意思? intval手册是这样描述intval通过使用特定的进制转换（默认是十进制），返回变量 var 的 integer 数值。但是将这个integer数值赋给$line[1]起到什么作用?
回复讨论(解决方案)
intval() 变量转成整数类型$line[1] = intval($line[1]); $line[2] = intval($line[2]);$line[3] = intval($line[3]);转化成整数类型的变量重新组合数组$line你也可以这样,重新赋值给变量$line_a = intval($line[1]); $line_b = intval($line[2]);$line_c = intval($line[3]);那么你的模板显示，对应的需要变动。
$line[1] = intval($line[1]);
的作用是：确保最终的 $line[1] 的值是整数
何况原作者已经做了说明
38行有 keep only the number of items ordered
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