从多维数组创建下拉列表

Question

I got this array:

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => tomato
        )

    [1] => Array
        (
            [id] => 2
            [name] => carrot
        )

    [2] => Array
        (
            [id] => 3
            [name] => apple
        )

)

I want to print each key/value pair in an HTML form, like so:

<select>
    <option value="1">tomato</option>
    <option value="2">carrot</option>
    <option value="3">apple</option>
</select>

So, I'm using a foreach loop to iterate over the three items in the outer array and then try to print the items in the inner array on a single line. I'm stuck with the last bit. The closest I've got so far is this:

foreach ($food_opts as $key => $value) {
    foreach ($value as $k => $v) {
        echo '<pre>' . $v . '</pre>';
    }
}

This retrieves the data I need but not in a usable format:

1
tomato
2
carrot
3
apple

In short, how do you target individual items in an inner array? Something like:

foreach ($food_opts as $key => $value) {
    foreach ($value as $k => $v) {
        echo '<pre>' . $v[0] . ' - ' . $v[1] . '</pre>';
    }
}

I understand why the above code doesn't work but can't figure out how to get the data how I want it.

Answer 1

You don't need a nested foreach here. Just do:

foreach ($food_opts as $key => $arr) {
    echo '<option value="'.$arr['id'].'">'.$arr['name'].'</option>', PHP_EOL;
}

Or, you can use printf() for a more cleaner approach:

foreach ($food_opts as $key => $arr) {
    printf('<option value="%s">%s</option>', $arr['id'], $arr['name']).PHP_EOL;
}

The printf() family of functions uses % character as a placeholder. %s means "take the next argument and print it as a string". Similarly, %d means "take the next argument and print it as an int".