How Can i use $_get with build_categories_options function

问题

Now I have create categories and create post is successful but when I edit my post I have problem if edit my post I will lose my category .. I need to get my category in table and I can change it

<?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>

My problem located in line 25

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

I need to get my category in first and show the rest of the results.

回答1:

For each category, you are displaying two options, an empty option and one with the category information:

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

This is inside your loop. So every time your loop iterates, two options will be created. A blank one and one with your category. I'm betting you just need one blank option at the very beginning of the <select>. I think this is what you wanted:

// 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;
}

Also, as @MoeTsao mentioned in the comments, try to avoid using mysql_* functions, as their use is discouraged by PHP. Instead, use mysqli_* or PDO.

来源：https://stackoverflow.com/questions/12650424/how-can-i-use-get-with-build-categories-options-function

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