使用php显示精确的数组元素

Question

I am able to display all the array elements using the code below but I would like to know how can I display several array elements only (for example 4th, 6th and 11th). Could you please help me.

$rates = $data->Rates->ExchangeRate;

    if (is_array($rates) && count($rates) > 0) {
        echo '<table><tr><th>ISO</th><th>Rate</th></tr>';

        foreach ($rates as $rate) {
            echo '<tr>';

            echo '<td>' . $rate->ISO . '</td><td>' . $rate->Rate . '</td></tr>';

            echo '</tr>';
        }

        echo '</table>';
    }

Answer 1

Just make an array of allowable key values and everytime check if the current key is included:

$rates = $data->Rates->ExchangeRate;
$allow = array(4,6,11);
    if (is_array($rates) && count($rates) > 0) {
        echo '<table><tr><th>ISO</th><th>Rate</th></tr>';

        foreach ($rates as $key => $rate) {
            if(!in_array($key, $allow){
                continue;//if not allowed, go to next iteration
            }
            echo '<tr>';

            echo '<td>' . $rate->ISO . '</td><td>' . $rate->Rate . '</td></tr>';

            echo '</tr>';
        }

        echo '</table>';
    }