PHP學習之制作乘法口訣表

進入學習php語言狀態。昨日看了一天視頻。才能夠把這個小口訣表實現。好難啊。

里面有個口訣表的函數、        

<?php
echo "=============================================<br/>";
for ($a=1;$a<=9;$a++){ //循環輸出a a默認值是1 a的值不會大于9 且不斷加一
                           
        for ($b=1;$b<=$a;$b++){//{b默認值是1  且b值不能大于a值 也就是九  加一運算
/*一開始a等于1的，滿足$a<=9  往下運行，b=1，滿足$b<=$a，輸出echo "$b x $a = $c"  ; 當b加一運算后，，不能滿足$b<=$a，跳出循環，運行echo "<br/>"  回到$a 循環，a加一 運算  此時a=2  滿足$a<=9  。往下運行，b=1，滿足$b<=$a，輸出echo "$b x $a = $c"，輸出后 b加一運算了  等于2還是滿足$b<=$a ，繼續往下運行，b=2，滿足$b<=$a，輸出echo "$b x $a = $c"
*/
        $c=$a*$b;           //定義變量C的值
    echo "$b x $a = $c"  ; //輸出變量b x 變量a 等于變量c 
    echo "              ";  //空格
        }
                           
    echo "<br/>";  //回車
    }
/*以上幾句代碼實現99乘法表
1 x 1 = 1
1 x 2 = 2 2 x 2 = 4
1 x 3 = 3 2 x 3 = 6 3 x 3 = 9
1 x 4 = 4 2 x 4 = 8 3 x 4 = 12 4 x 4 = 16
1 x 5 = 5 2 x 5 = 10 3 x 5 = 15 4 x 5 = 20 5 x 5 = 25
1 x 6 = 6 2 x 6 = 12 3 x 6 = 18 4 x 6 = 24 5 x 6 = 30 6 x 6 = 36
1 x 7 = 7 2 x 7 = 14 3 x 7 = 21 4 x 7 = 28 5 x 7 = 35 6 x 7 = 42 7 x 7 = 49
1 x 8 = 8 2 x 8 = 16 3 x 8 = 24 4 x 8 = 32 5 x 8 = 40 6 x 8 = 48 7 x 8 = 56 8 x 8 = 64
1 x 9 = 9 2 x 9 = 18 3 x 9 = 27 4 x 9 = 36 5 x 9 = 45 6 x 9 = 54 7 x 9 = 63 8 x 9 = 72 9 x 9 = 81
*/
?>
<?php
echo "=============================================<br/>";
for ($x=9;$x>=1;$x-- ){
  for ($y=9;$y>=$x;$y--){
      $z=$x*$y;
      echo "$y X $x =$z";
      echo "         ";
  }
   echo "<br/>";
}
 ?>
<?php                                                //******乘法表函數*********
echo "=============================================<br/>";
function cheng($a,$b=9){ 
                                                    //a是一個乘數；b是另一個乘數，初始值是9
    for ($x=$a;$x<=$b;$x++){
                               
        for ($y=1;$y<=$x;$y++){
            $z=$y*$x;
            echo "$y X $x =$z";
            echo "  ";
        }
    echo "<br/>";
    }
}
echo cheng(3,7);  調用了函數
echo "=============================================<br/>";
echo cheng(1 );
//**********乘法表函數*********
?>