PHP流程控制

switch(变量){
    case 1:
        echo "";
        break;
    case 2:
    case 3:
    case 4:
        echo "";
        break;    
    ....
    default[可省]:
        echo "";
        break;
}

for($a=1,$b=1;$a<=9;){
    echo $a.'x'.$b.'='.$a*$b.'&nbsp&nbsp&nbsp&nbsp';
    if($a==$b){
        $a++;
        $b=0;
        echo "
";
    }
    $b++;
}