Php 创建下一个/上一个分页链接

我在一个公文包网站上工作，所有项目都在数组中，我创建了一个项目模板页面，该页面使用GET变量设置当前项目，并将适当的内容加载到页面中。我试图在底部添加链接，链接到下一个和上一个项目，但无法找到正确的方法来编写链接

以下是阵列的外观：

$projects = array();

$projects["Beeston-Residence"] = array(
 "name" => "Beeston House",
 "heroClass" => "hero-beeston",
 "mainImg" => BASE_URL ."images/beeston_main.jpg",
 "previewImg" => BASE_URL ."images/beeston_preview.jpg",
 "year" => "2014",
 "yearClass" => "twenty14",
 "location" => "Brisbane, Australia",
 "photographer" => "Rachel Cruz",
 "detailOne" => BASE_URL ."images/beeston_detail1.jpg",
 "detailTwo" => BASE_URL ."images/beeston_detail2.jpg",
 "detailThree" => BASE_URL ."images/beeston_detail3.jpg",
 "detailFour" => BASE_URL ."images/beeston_detail4.jpg",
 "description" => "lorem ipsum and shit",
 "detailOneSum" => "lorem ipsum detail 1",
 "detailTwoSum" => "lorem ipsum detail 2",
 "detailThreeSum" => "lorem ipsum detail 3",
 "detailFourSum" => "Lorem ipsum detail 4",
 "materials" => array("matOne","matTwo","matThree"),
 "materialImg" => array(BASE_URL ."images/beeston_mat1.jpg",BASE_URL   ."images/beeston_mat2.jpg",BASE_URL ."images/beeston_mat3.jpg"),
 "testamonialImg" => BASE_URL ."images/client.jpg",
 "testamonial" => "Cabin Is Great!"
);

$projects["Book-Tower-Residence"] = array(
 "name" => "Book Tower House",
 "heroClass" => "hero-bookTower",
 "mainImg" => BASE_URL ."images/bookTower_main.jpg",
 "previewImg" => BASE_URL ."images/bookTower_preview.jpg",
 "year" => "2012",
 "yearClass" => "twenty12",
 "location" => "London, United Kingdom",
 "photographer" => "Rachel Cruz",
 "detailOne" => BASE_URL ."images/bookTower_detail1.jpg",
 "detailTwo" => BASE_URL ."images/bookTower_detail2.jpg",
 "detailThree" => BASE_URL ."images/bookTower_detail3.jpg",
 "detailFour" => BASE_URL ."images/bookTower_detail4.jpg",
 "description" => "lorem ipsum and shit",
 "detailOneSum" => "lorem ipsum",
 "detailTwoSum" => "lorem ipsum",
 "detailThreeSum" => "lorem ipsum",
 "detailFourSum" => "Lorem ipsum",
 "materials" => array("matOne","matTwo","matThree"),
 "materialImg" => array(BASE_URL ."images/bookTower_mat1.jpg",BASE_URL ."images/bookTower_mat2.jpg",BASE_URL ."images/bookTower_mat3.jpg"),
 "testamonialImg" => BASE_URL ."images/client.jpg",
 "testamonial" => "Cabin Is Great!"
);
$projects["1917-Bungalow"] = array(
 "name" => "1917 Bungalow",
 "heroClass" => "hero-bungalow",
 "mainImg" => BASE_URL ."images/bungalow_main.jpg",
 "previewImg" => BASE_URL ."images/bungalow_preview.jpg",
 "year" => "2013",
 "yearClass" => "twenty13",
 "location" => "Autstin, Texas",
 "photographer" => "Rachel Cruz",
 "detailOne" => BASE_URL ."images/bungalow_detail1.jpg",
 "detailTwo" => BASE_URL ."images/bungalow_detail2.jpg",
 "detailThree" => BASE_URL ."images/bungalow_detail3.jpg",
 "detailFour" => BASE_URL ."images/bungalow_detail4.jpg",
 "description" => "lorem ipsum and shit",
 "detailOneSum" => "lorem ipsum",
 "detailTwoSum" => "lorem ipsum",
 "detailThreeSum" => "lorem ipsum",
 "detailFourSum" => "Lorem ipsum",
 "materials" => array("matOne","matTwo","matThree"),
 "materialImg" => array(BASE_URL ."images/bungalow_mat1.jpg",BASE_URL ."images/bungalow_mat2.jpg",BASE_URL ."images/bungalow_mat3.jpg"),
 "testamonialImg" => BASE_URL ."images/client.jpg",
 "testamonial" => "Cabin Is Great!"
);

等等。。。该阵列共有15个项目

项目筛选到的项目模板设置如下：

<?php
require_once("../includes/config.php");
require_once(ROOT_PATH . "includes/projectInfo.php");
$project_id = $_GET["id"];
$project = $projects[$project_id];
include (ROOT_PATH . "includes/header-project-page.php");

?>


    <section class="l-col-group project-intro">
    <h2 class="project-title"><?php echo $project["name"]; ?> </h2>
    <aside class="project-info">
    <ul class="project-brief">
        <li class="pb-heading">STATUS </li>
        <li class="pb-info">Complete <?php echo $project["year"];?></li>
        <li class="pb-heading">LOCATION</li>
        <li class="pb-info"><?php echo $project["location"];?></li>
        <li class="pb-heading">PHOTOGRAPHER</li>
        <li class="pb-info"><?php echo $project["photographer"];?></li>
    </ul>
    </aside>
    <p class="project-summary">
        <?php echo $project["description"];?>
    </p>
</section>


<section>
    <figure class="l-col-group">

        <figcaption class= "left">
            <h3>VISION</h3>
                <p><?php echo $project["detailOneSum"];?></p>
        </figcaption>
        <img class="project-detail-img right" src="<?php echo $project["detailOne"];?>" alt="">
    </figure>


    <figure class="l-col-group">

        <figcaption class="right">
            <h3>DESIGN</h3>
                <p><?php echo $project["detailTwoSum"];?></p>
        </figcaption>
        <img  class="project-detail-img left" src="<?php echo $project["detailTwo"];?>" alt="">
    </figure>

    <figure class="l-col-group left">   

        <figcaption class="left">
            <h3>DEVELOPMENT</h3>
                <p><?php echo $project["detailThreeSum"];?></p>
        </figcaption>
        <img class="project-detail-img right" src="<?php echo $project["detailThree"];?>" alt="">
    </figure>

    <figure class="l-col-group">

        <figcaption class="right">
            <h3>TEAM</h3>
                <p><?php echo $project["detailFourSum"];?></p>
        </figcaption>
            <img class="project-detail-img left" src="<?php echo $project["detailFour"];?>" alt="">

    </figure>
</section>
<section class="testamonial">
    <img class="testamonial-image" src="<?php echo BASE_URL; ?>images/testamonial.png" alt="testamonial">
    <h3 class="testamonial-client">DAVID WALSH</h3>
    <p class="testamonial-quote">Cabin surpassed went above and beyond my wildest dreams! Customer service at its best.</p>

</section>
include (ROOT_PATH . "includes/contact.php");
include (ROOT_PATH . "includes/footer.php");
?>

我很幸运地使用以下命令检索了阵列中的当前项目位置：

 <?php $key = array_search($project, $projects); 
    $offset = array_search($key, array_keys($projects));
    $next = $offset + 1;
    $prev = $offset - 1;
    ?>

但是我很难弄清楚如何使用这些信息来创建指向阵列中下一个项目的链接

我试着这样做，但不知道把什么作为链接

    <?php if ($prev > 0): ?>
        <a style ="color:black" href="">Previous</a>
    <?php endif; ?>

    <?php

提前谢谢你的帮助。

---

干杯。

传递索引而不是ID可能更好、更简单：

// get project id
$lst_ids = array_keys($project);
$i = !empty($_GET["i"]) ? $_GET["i"] : 0;
$project_id = $lst_ids[$i];

// show previous and next links, as applicable
$l = count($projects);    // should give 15
$html = '';
if ($i) {
    $i_prev = $i - 1;
    $label = "← Previous";
    $html .= "<a href='?i=$i_prev'>$label</a>";
}

if ($i < ($l - 1)) {
    $i_next = $i + 1;
    $label = "Next&nbsp;&rarr;";
    $html .= "&nbsp;<a href='?i=$i_next'>$label</a>";
}
echo $html;

或者，如果要传递ID：

$l = count($projects);    // should give 15
$lst_ids = array_keys($project);
$project_id = !empty($_GET["id"]) ? $_GET["id"] : NULL;
$index = $project_id ? array_search($project_id, $lst_ids) : 0;

$html = '';
if ($index) {
    $id_prev = $lst_ids[$index - 1];
    $label = "← Previous";
    $html .= "<a href='?id=$id_prev'>$label</a>";
}

if ($index < ($l - 1)) {
    $id_next = $lst_ids[$index + 1];
    $label = "Next&nbsp;&rarr;";
    $html .= "&nbsp;<a href='?id=$id_next'>$label</a>";
}
echo $html;

---

您真的需要使用项目名称作为数组键吗？你可以只使用数字，这样就更容易实现你想要的。我使用项目名称作为数组键，因为这是我发现最容易通过重写清理url的方式，例如，项目的url将是/projects/Beeston-Residence，我还在学习php的过程中，一次只做一个问题的决策，而没有考虑它会对以后的其他事情产生什么影响。如果没有数字作为关键，实现起来会困难得多吗？谢谢Stefan，但不幸的是它不起作用。之前的Href最终以@VinceBrown的形式出现：好的，我做了一些编辑-试试看？Stefan抱歉，我没有回复你！感谢您的尝试，但不幸的是，这些都没有工作。这一切都是为了一个学校项目，最后期限很快就要到了，所以现在我只是把它放在次要位置，继续前进。如果你还有其他想法，我愿意接受你的建议。再次感谢你的帮助