$line[1] = intval($line[1]); //这个这样写是什么意思?-PHP Tutorial-php.cn

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$line[1] = intval($line[1]); //这个这样写是什么意思?

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Jun 23, 2016 pm 02:38 PM

<?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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