php数组学习图书信息遍历

2020-04-08

一个简单二维数组遍历的实例。

1.新建一个shuzu.php文件用来存储图书信息和排序方法

源代码：

<?php
$book1 = array("name" => "php", "author" => "tom", "price" => 18.9);
$book2 = array("name" => "java", "author" => "mike", "price" => 6.7);
$book3 = array("name" => "c语言", "author" => "jim", "price" => 8.4);
$book4 = array("name" => "操作系统", "author" => "abel", "price" => 9.1);
$book5 = array("name" => "编译原理", "author" => "kvein", "price" => 23);
$mybooks = array($book1, $book2, $book3, $book4, $book5);
//书的种类个数
$n = count($mybooks);
//按价格升序排列
function cmp_price($v1,$v2){
    return $v1["price"]-$v2["price"];
//    if ($v1["price"]==$v2["price"]) return 0;
//    return $v1["price"]>$v2["price"]?1:-1;
}
//按作者姓名排序
function cmp_author($v1,$v2){
    return strcasecmp($v1["author"],$v2["author"]);
}
//按书的名字排序
function cmp_name($v1,$v2){
    return strcasecmp($v1["name"],$v2["name"]);
}

新建一个mybooks.php的文件用来做页面处理和信息的输出

源代码：

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>mybooks</title>
    <style>
        table {
            width: 400px;
            border: #000000 1px solid;
            border-collapse: collapse;
            text-align: center;
        }

        td, th {
            border: #000000 1px solid;
        }
    </style>
</head>
<body>
<?php
include_once "shuzu.php";
?>
<h2>本书房有<?= $n ?>本书</h2>
<?php
$str = "";
if (isset($_GET["by_what"])) :
    switch ($_GET["by_what"]) {
        case "author":
            $str = "按作者排序的结果是：";
            usort($mybooks, "cmp_author");
            break;
        case "name":
            $str = "按书名排序的结果是：";
            usort($mybooks, "cmp_name");
            break;
        case "price":
            $str = "按价格排序的结果是：";
            usort($mybooks, "cmp_price");
            break;
    }
endif;
?>
<div>
    <?= $str ?>
</div>
<table>
    <tr>
        <th>序号</th>
        <th>图书信息</th>
    </tr>
    <?php
    foreach ($mybooks as $k => $v) :
        ?>
        <tr>
            <td rowspan="3"><?= $k + 1 ?></td>
            <td>书名：<?= $v["name"] ?></td>
        </tr>
        <tr>
            <td>作者：<?= $v["author"] ?></td>
        </tr>
        <tr>
            <td>价格：<?= $v["price"] ?></td>
        </tr>
    <?php
    endforeach;
    ?>
</table>
请选择排序方式
<form action="#" method="get">
    <select name="by_what" id="">
        <option value="select">请选择</option>
        <option value="author">作者</option>
        <option value="name">书名</option>
        <option value="price">价格</option>
    </select>
    <input type="submit" value="提交">
</form>
</body>
</html>

演示效果：

本文作者： nowfitness
本文链接： https://www.nowfitness.top/archives/2040c2c6.html
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