编写一个PHP代码来打印以下数字模式

<?php
// 定义要打印的数字模式
$pattern = [
    [1, 2, 3, 4, 5],
    [6, 7, 8, 9, 10],
    [11, 12, 13, 14, 15],
    [16, 17, 18, 19, 20]
];

// 打印数字模式
foreach ($pattern as $row) {
    foreach ($row as $number) {
        echo $number . " ";
    }
    echo "\n";
}
?>

1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20