PHP melaksanakan gelung sementara untuk mencetak berlian pepejal

<?php
// 设置菱形的大小
$size = 5;

// 打印上半部分菱形
$row = 1;
while ($row <= $size) {
    $col = 1;
    while ($col <= $size - $row) {
        echo " ";
        $col++;
    }
    $col = 1;
    while ($col <= 2 * $row - 1) {
        echo "*";
        $col++;
    }
    echo "
";
    $row++;
}

// 打印下半部分菱形
$row = $size - 1;
while ($row >= 1) {
    $col = 1;
    while ($col <= $size - $row) {
        echo " ";
        $col++;
    }
    $col = 1;
    while ($col <= 2 * $row - 1) {
        echo "*";
        $col++;
    }
    echo "
";
    $row--;
}
?>