从多个PHP数组中下拉选项组 [英] Drop Down Option Groups from Multiple PHP Arrays

问题描述

我有一个简单的问题，希望这是一个容易回答的问题:

I have a quick question, and hopefully this is an easy one to answer:

我目前有以下PHP代码(可以正常工作):

I currently have the following PHP code (which works fine):

<? 
    $teams = array ('Team 1' => 'T1', 'Team 2' => 'T2', 'Team 3' => 'T3');

    foreach ($teams as $team_name => $team_code) {
        if ($row['db_code'] == $team_code) {          // This is from a MySQL query
            echo "<option value=\"$team_code\" selected>$team_name</option>";
        }
        else {
            echo "<option value=\"$team_code\">$team_name</option>";
        }
    }
?>

如何在我的foreach语句中添加一个附加数组，然后细分为<optgroups>?

How can I add an additional array into my foreach statement, and then divy up into <optgroups>?

$colors = array('Color 1' => 'C1', 'Color 2' => 'C2', 'Color 3' => 'C3');

这样，它将在HTML中显示如下:

This way, it would show up like this in the HTML:

<select id="some_id">
    <optgroup label="Teams">
        <option value="T1">Team 1</option>
        <option value="T2">Team 2</option>
        <option value="T3">Team 3</option>
    <optgroup label="Colors">
        <option value="C1">Color 1</option>
        <option value="C2">Color 2</option>
        <option value="C3">Color 3</option>
</select>

推荐答案

foreach($drop_down_options as $group_name => $group){
    echo "<optgroup label=\"$group_name\">";

    foreach($group as $value => $name){
        echo "<option value=\"$value\" selected>$name</option>";
    }

    echo "</optgroup>";
}     

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