Question

我正在使用这个PHP从RSS提取标题列表：

<?php require_once( magpie/rss_fetch.inc );
$rss = fetch_rss( http://live.visitmix.com/Sessions/RSS );

foreach ($rss->items as $item) { 
    $cat = $item[ category ];
    $title = $item[ title ];
        echo  <li class=" .$cat. "> .$title. </li> ;
}

?>

我想使用<category>将其添加为类，但是每个<item>都会出现<category>元素，具体取决于标题出现1,2,3,4次或更多。如果有多个类别，我该如何将类别元素分开并用空格分隔？

Answer 1

把分类积累到一个数组中，然后将该数组合并起来怎么样？

$categoriesArray = array();

foreach ($rss->items as $item) { 
    array_push($categoriesArray, $item[ category ]);
}
$categories = implode(" ", $categoriesArray);

编辑添加

如果累积了类别，你可以尝试像这样做：

$categoriesByTitle = array();

foreach ($rss->items as $item) { 
        $currentTitle = $item[ title ];
        $categories = $categoriesByTitle[$currentTitle];
        if ($categories == NULL) {
            $categories = array();
            $categoriesByTitle[$currentTitle] = $categories;
        }
        if (!in_array($item[ category ], $categories)) {
            array_push($categories, $item[ category ]);
        }
}
foreach ($categoriesByTitle as $title=>$category) {
    // use implode for each title
    $categoryString = implode(" ", $category);
    echo  <li class=" .$categoryString. "> .$title. </li> ;
}

请查看数组的参考资料，它在处理这类问题时非常有用。

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