创建下一个/上一个分页链接

Question

我在一个投资组合网站上工作，并将所有项目放在数组中，我创建了一个项目模板页面，该页面使用 GET 变量来设置当前项目并将适当的内容加载到页面中。我正在尝试在底部添加链接到下一个和上一个项目的链接，但无法找出编写链接的正确方法

数组如下所示：

$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...数组共有15个项目

项目被过滤到的项目模板是这样设置的：

<?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方法检索了当前项目在数组中的位置：

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

但是在弄清楚如何使用这些信息来创建指向数组中下一个项目的链接时遇到了麻烦

我正在尝试这样的事情，但不知道该放什么作为链接

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

    <?php

提前感谢您的帮助。 干杯。

Answer 1

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;

或者如果你想传递 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;