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Home  >  Article  >  Backend Development  >  Find a recursive function to return the displayed data in data form

Find a recursive function to return the displayed data in data form

WBOY
WBOYOriginal
2016-07-06 13:53:04925browse

<code>        function strToLeft($num,$arr){
            $i = $arr[$num];
            unset($arr[$num]);
            array_push($arr,$i);
            return $arr;
        }

        function combine_increase($arr, $start, $result, $count, $NUM, $arr_len)  
        {  
          $i = 0; 
          for ($i = $start; $i < $arr_len + 1 - $count; $i++)  
          {  
            $result[$count - 1] = $i;  
            if ($count - 1 == 0)  
            {  
              $tmp=array();
              for ($j = $NUM - 1; $j >= 0; $j--)  {
                //if ($j!=0){echo($arr[$result[$j]].",");  }else{echo($arr[$result[$j]]);  }
                array_push($tmp, $arr[$result[$j]]);
              }
              var_dump(strToLeft(rand(0,$NUM-1),$tmp));
              echo("<br/>");  

            }  
            else  { combine_increase($arr, $i + 1, $result, $count - 1, $NUM, $arr_len);  }
          }  
        } 
        
         $arr = array('a1','b2','c3','d4','e5','x1','y1','z1');
         $num = 3;  
         $result[$num]=array();
         echo "('a1','b2','c3','d4','e5','x1','y1','z1')";
         echo "<br/>";
         combine_increase($arr, 0, $result, $num, $num, count($arr));</code>

The above code can generate array('a1','b2','c3','d4','e5','x1','y1','z1'); three elements in this array For different combinations, you can execute it through laravel (written with this framework) or php (it may need to be slightly modified), and take a look at the displayed results. The results should be as follows:

('a1','b2','c3','d4','e5','x1','y1','z1')
array(3) { [0]=> string(2) "a1" [2]=> string(2) "c3" [3]=> string(2) "b2" }
array(3) { [0]=> string( 2) "a1" [2]=> string(2) "d4" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) "e5" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "a1 " [1]=> string(2) "b2" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "a1" [ 2]=> string(2) "y1" [3]=> string(2) "b2" }
array(3) { [1]=> string(2) "b2" [2] => string(2) "z1" [3]=> string(2) "a1" }
array(3) { [0]=> string(2) "a1" [2]=> ; string(2) "d4" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [2]=> string (2) "e5" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [1]=> string(2 ) "c3" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) " y1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) "e5" [3 ]=> string(2) "d4" }
array(3) { [1]=> string(2) "d4" [2]=> string(2) "x1" [3]= > string(2) "a1" }
array(3) { [0]=> string(2) "a1" [1]=> string(2) "d4" [3]=> string(2) "y1" }
array(3) { [1]=> string(2) "d4" [2]=> string(2) "z1" [3]=> string( 2) "a1" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "x1" [3]=> string(2) "a1" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "a1 " }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "a1" }
array(3) { [0]=> string(2) "a1" [1]=> string(2) "x1" [3]=> string(2) "y1" }
array(3) { [1]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "a1" }
array (3) { [0]=> string(2) "a1" [2]=> string(2) "z1" [3]=> string(2) "y1" }
array(3 ) { [1]=> string(2) "c3" [2]=> string(2) "d4" [3]=> string(2) "b2" }
array(3) { [1]=> string(2) "c3" [2]=> string(2) "e5" [3]=> string(2) "b2" }
array(3) { [0 ]=> string(2) "b2" [2]=> string(2) "x1" [3]=> string(2) "c3" }
array(3) { [0]= > string(2) "b2" [1]=> string(2) "c3" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "b2" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string( 2) "b2" [1]=> string(2) "d4" [3]=> string(2) "e5" }
array(3) { [1]=> string(2) "d4" [2]=> string(2) "x1" [3]=> string(2) "b2" }
array(3) { [1]=> string(2) "d4 " [2]=> string(2) "y1" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "b2" [ 2]=> string(2) "z1" [3]=> string(2) "d4" }
array(3) { [0]=> string(2) "b2" [2] => string(2) "x1" [3]=> string(2) "e5" }
array(3) { [0]=> string(2) "b2" [1]=> ; string(2) "e5" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "b2" [1]=> string (2) "e5" [3]=> string(2) "z1" }
array(3) { [0]=> string(2) "b2" [1]=> string(2 ) "x1" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "b2" [2]=> string(2) " z1" [3]=> string(2) "x1" }
array(3) { [1]=> string(2) "y1" [2]=> string(2) "z1" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3 ]=> string(2) "e5" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3]= > string(2) "x1" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3]=> string( 2) "z1" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "x1" [3]=> string(2) "c3" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "c3 " }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "c3" [2]=> string(2) "y1" [3]=> string(2) "x1" }
array(3) { [1]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "c3" [2]=> string(2) "z1" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "d4" [2]=> string(2) "x1" [3]=> string(2) "e5" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "d4" }
array(3) { [0]=> string(2) "d4" [1]=> string(2) "e5" [3]=> string(2) "z1" }
array(3) { [0]=> string(2) "d4" [2]=> string(2) "y1" [3]=> string(2) "x1" }
array(3) { [1]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "d4" }
array(3) { [1]=> string(2) "y1" [2]=> string(2) "z1" [3]=> string(2) "d4" }
array(3) { [0]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "y1" }

array(3) { [0]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "y1" }

每次生成的结果每行可能有变化，但是行数不变

**

这个函数虽然能列印出来这个结果，但是我想通过return把以上n行一维数组以一个整体的二维数组返回并可以调用对比等，一直没人能解答，苦苦求问！！！

**

Reply content: 

<code>        function strToLeft($num,$arr){
            $i = $arr[$num];
            unset($arr[$num]);
            array_push($arr,$i);
            return $arr;
        }

        function combine_increase($arr, $start, $result, $count, $NUM, $arr_len)  
        {  
          $i = 0; 
          for ($i = $start; $i < $arr_len + 1 - $count; $i++)  
          {  
            $result[$count - 1] = $i;  
            if ($count - 1 == 0)  
            {  
              $tmp=array();
              for ($j = $NUM - 1; $j >= 0; $j--)  {
                //if ($j!=0){echo($arr[$result[$j]].",");  }else{echo($arr[$result[$j]]);  }
                array_push($tmp, $arr[$result[$j]]);
              }
              var_dump(strToLeft(rand(0,$NUM-1),$tmp));
              echo("<br/>");  

            }  
            else  { combine_increase($arr, $i + 1, $result, $count - 1, $NUM, $arr_len);  }
          }  
        } 
        
         $arr = array('a1','b2','c3','d4','e5','x1','y1','z1');
         $num = 3;  
         $result[$num]=array();
         echo "('a1','b2','c3','d4','e5','x1','y1','z1')";
         echo "<br/>";
         combine_increase($arr, 0, $result, $num, $num, count($arr));</code>

The above code can generate array('a1','b2','c3','d4','e5','x1','y1','z1'); three elements in this array For different combinations, you can execute it through laravel (written with this framework) or php (it may need to be slightly modified), and take a look at the displayed results. The results should be as follows:

('a1','b2','c3','d4','e5','x1','y1','z1')
array(3) { [0]=> string(2) "a1" [2]=> string(2) "c3" [3]=> string(2) "b2" }
array(3) { [0]=> string( 2) "a1" [2]=> string(2) "d4" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) "e5" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "a1 " [1]=> string(2) "b2" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "a1" [ 2]=> string(2) "y1" [3]=> string(2) "b2" }
array(3) { [1]=> string(2) "b2" [2] => string(2) "z1" [3]=> string(2) "a1" }
array(3) { [0]=> string(2) "a1" [2]=> ; string(2) "d4" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [2]=> string (2) "e5" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [1]=> string(2 ) "c3" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) " y1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "a1" [2]=> string(2) "e5" [3 ]=> string(2) "d4" }
array(3) { [1]=> string(2) "d4" [2]=> string(2) "x1" [3]= > string(2) "a1" }
array(3) { [0]=> string(2) "a1" [1]=> string(2) "d4" [3]=> string(2) "y1" }
array(3) { [1]=> string(2) "d4" [2]=> string(2) "z1" [3]=> string( 2) "a1" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "x1" [3]=> string(2) "a1" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "a1 " }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "a1" }
array(3) { [0]=> string(2) "a1" [1]=> string(2) "x1" [3]=> string(2) "y1" }
array(3) { [1]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "a1" }
array (3) { [0]=> string(2) "a1" [2]=> string(2) "z1" [3]=> string(2) "y1" }
array(3 ) { [1]=> string(2) "c3" [2]=> string(2) "d4" [3]=> string(2) "b2" }
array(3) { [1]=> string(2) "c3" [2]=> string(2) "e5" [3]=> string(2) "b2" }
array(3) { [0 ]=> string(2) "b2" [2]=> string(2) "x1" [3]=> string(2) "c3" }
array(3) { [0]= > string(2) "b2" [1]=> string(2) "c3" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "b2" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string( 2) "b2" [1]=> string(2) "d4" [3]=> string(2) "e5" }
array(3) { [1]=> string(2) "d4" [2]=> string(2) "x1" [3]=> string(2) "b2" }
array(3) { [1]=> string(2) "d4 " [2]=> string(2) "y1" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "b2" [ 2]=> string(2) "z1" [3]=> string(2) "d4" }
array(3) { [0]=> string(2) "b2" [2] => string(2) "x1" [3]=> string(2) "e5" }
array(3) { [0]=> string(2) "b2" [1]=> ; string(2) "e5" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "b2" [1]=> string (2) "e5" [3]=> string(2) "z1" }
array(3) { [0]=> string(2) "b2" [1]=> string(2 ) "x1" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "b2" [2]=> string(2) " z1" [3]=> string(2) "x1" }
array(3) { [1]=> string(2) "y1" [2]=> string(2) "z1" [3]=> string(2) "b2" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3 ]=> string(2) "e5" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3]= > string(2) "x1" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "c3" [1]=> string(2) "d4" [3]=> string( 2) "z1" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "x1" [3]=> string(2) "c3" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "c3 " }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "c3" [2]=> string(2) "y1" [3]=> string(2) "x1" }
array(3) { [1]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "c3" }
array(3) { [0]=> string(2) "c3" [2]=> string(2) "z1" [3]=> string(2) "y1" }
array(3) { [0]=> string(2) "d4" [2]=> string(2) "x1" [3]=> string(2) "e5" }
array(3) { [1]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "d4" }
array(3) { [0]=> string(2) "d4" [1]=> string(2) "e5" [3]=> string(2) "z1" }
array(3) { [0]=> string(2) "d4" [2]=> string(2) "y1" [3]=> string(2) "x1" }
array(3) { [1]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "d4" }
array(3) { [1]=> string(2) "y1" [2]=> string(2) "z1" [3]=> string(2) "d4" }
array(3) { [0]=> string(2) "e5" [2]=> string(2) "y1" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "x1" }
array(3) { [0]=> string(2) "e5" [2]=> string(2) "z1" [3]=> string(2) "y1" }

array(3) { [0]=> string(2) "x1" [2]=> string(2) "z1" [3]=> string(2) "y1" }

每次生成的结果每行可能有变化，但是行数不变

**

这个函数虽然能列印出来这个结果，但是我想通过return把以上n行一维数组以一个整体的二维数组返回并可以调用对比等，一直没人能解答，苦苦求问！！！

**

这是个递归函数。。其实你要是在Larvae里面用，某个控制器，或者你自己写的class。反正一定要是个类里面，就可以这样

首先在顶端声明一个变量

<code>var $res_array;
</code>

然后在初始化里面去填空这个数组

<code>$this->res_array = [];
</code>

然后在下面你的Function里面，不要输出，而是放到数组里。

<code>        function combine_increase($arr, $start, $result, $count, $NUM, $arr_len)  
        {  
          $i = 0; 
          for ($i = $start; $i < $arr_len + 1 - $count; $i++)  
          {  
            $result[$count - 1] = $i;  
            if ($count - 1 == 0)  
            {  
              $tmp=array();
              for ($j = $NUM - 1; $j >= 0; $j--)  {
                //if ($j!=0){echo($arr[$result[$j]].",");  }else{echo($arr[$result[$j]]);  }
                array_push($tmp, $arr[$result[$j]]);
              }
              $this->res_array[] = strToLeft(rand(0,$NUM-1),$tmp);

            }  
            else  { combine_increase($arr, $i + 1, $result, $count - 1, $NUM, $arr_len);  }
          }  
        }
        </code>

最后调用的时候

<code> $arr = array('a1','b2','c3','d4','e5','x1','y1','z1');
 $num = 3;  
 $result[$num]=array();
 echo "('a1','b2','c3','d4','e5','x1','y1','z1')";
 echo "<br/>";
 combine_increase($arr, 0, $result, $num, $num, count($arr));
 $res = $this->res_array; //就是你要的东西了
 </code>

不过这里注意，一定是个类才能这么玩，PHP也有种办法，其实就是声明一个全局变量，然后把你所有echo数组的那里变成存入这个变量。最后取这个变量就行了。。。

或者。你如果不想用全局变量。那么就传递吧。

<code>        function combine_increase($arr, $start, $result, $count, $NUM, $arr_len, &$res_arr)  
        {  
          $i = 0; 
          for ($i = $start; $i < $arr_len + 1 - $count; $i++)  
          {  
            $result[$count - 1] = $i;  
            if ($count - 1 == 0)  
            {  
              $tmp=array();
              for ($j = $NUM - 1; $j >= 0; $j--)  {
                //if ($j!=0){echo($arr[$result[$j]].",");  }else{echo($arr[$result[$j]]);  }
                array_push($tmp, $arr[$result[$j]]);
              }
              $res_arr[] = strToLeft(rand(0,$NUM-1),$tmp);

            }  
            else  { combine_increase($arr, $i + 1, $result, $count - 1, $NUM,  $arr_len,$res_arr);  }
          }  
        } 
        </code>

调用的时候

<code> $arr = array('a1','b2','c3','d4','e5','x1','y1','z1');
 $num = 3;  
 $result[$num]=array();
 echo "('a1','b2','c3','d4','e5','x1','y1','z1')";
 echo "<br/>";
 combine_increase($arr, 0, $result, $num, $num, count($arr), $res_arr);
 var_dump($res_arr); //$res_arr就你要的那个</code>

你可以去看看这个函数array_combine()，他拥有自动排序的功能

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