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现在我已经创建类别并且创建帖子成功但是当我编辑我的帖子时我有问题如果编辑我的帖子我会丢失我的类别..我需要在表格中获取我的类别并且我可以更改它

<?php

$sql = "SELECT catid, catname, parentid FROM categories";
$res = mysql_query($sql);

// initialize $categories to make sure it is an array
$categories = array();
while ($row = mysql_fetch_assoc($res)) {
$parent = intval($row['parentid']);
$categories[$parent][] = $row;
    }
    ?>
    <table border="0" cellpadding="10" cellspacing="0">
    <tr>
    <td valign="top">

    <?php
    $category_string = "";
    function build_categories_options($parent, $categories, $level) {
        global $category_string;
        if (isset($categories[$parent]) && count($categories[$parent])) {
            $level .= " - ";
            foreach ($categories[$parent] as $category) {
                $opt_value = substr($level.$category['catname'],3);
                $category_string .= '<option value=""></option><option value="'.$category['catid'].'">'.$opt_value.'</option>';
                build_categories_options($category['catid'], $categories, $level);
            }
            $level = substr($level, -3);
        }
        return $category_string;
    }
    $category_options = build_categories_options(0, $categories, '');
    $category_options = '<select class="chosen" name="categories" id="categories">'.$category_options.'</select>';
    echo $category_options; 
    ?>
</td>

我的问题位于第 25 行

$category_string .= '<option value=""></option><option value="'.$category['catid'].'">'.$opt_value.'</option>';

我需要首先获得我的类别并显示其余结果。

4

1 回答 1

0

对于每个类别,您将显示两个选项,一个空选项和一个带有类别信息的选项:

$category_string .= '<option value=""></option><option value="'.$category['catid'].'">'.$opt_value.'</option>';

这是在你的循环内。因此,每次循环迭代时,都会创建两个选项。一个空白的一个和一个与您的类别。我打赌你只需要<select>. 我想这就是你想要的:

// notice we are initializing $category_string with an empty option here
$category_string = '<option value=""></option>';

function build_categories_options($parent, $categories, $level) {
    global $category_string;
    if (isset($categories[$parent]) && count($categories[$parent])) {
        $level .= " - ";
        foreach ($categories[$parent] as $category) {
            $opt_value = substr($level.$category['catname'],3);

            // removed extra empty category and put it in $category_string initialization
            $category_string .= '<option value="'.$category['catid'].'">'.$opt_value.'</option>';
            build_categories_options($category['catid'], $categories, $level);
        }
        $level = substr($level, -3);
    }
    return $category_string;
}

此外,正如@MoeTsao 在评论中提到的那样,尽量避免使用mysql_*函数,因为 PHP 不鼓励使用它们。相反,使用mysqli_*or PDO

于 2012-10-01T12:41:01.840 回答