PHP中使用循环实现的金字塔图形_php技巧

for ($i=1;$i         switch ($i){
            case 1:
                echo "  "."*"."  ";
                break;
            case 2:
                echo "     ";
                break;
            case 3:
                echo " "."*"." "."*"." ";
                break;
            case 4:
                echo "     ";
                break;
            case 5:
                echo "*"." "."*"." "."*";
                break; 
        }
    echo "
";