PHP is a combination of 1 to 9 numbers equals 20 method, PHP permutation combined _php Tutorial

PHP is a combination of 1 to 9 numbers equal to 20 of the method, the PHP permutation

This example describes how PHP can add 1 to 9 numbers equal to 20 by arranging combinations. Share to everyone for your reference. The implementation method is as follows:

<?phpset_time_limit (0);/* Function Description: Huoqu_zhuhe ($eq, $jiashu, $isone =0) parameter description: $eq---sum of several numbers; $jiashu-------addend array: $ Jiashu=array (1,2,3,4,5,6,7,8,9), which can be used addend; $isone---whether to use a different addend each time, uniqueness, 1 is 0 no, the default 1 return type: array, number with + concatenated string: [0] = = 3+8+9 [1] = > 4+7+9 Test Results: 1: For the addend array is small, the speed can, too big, some slow; 2: Each time you can use a different addend, the process will be slow to use the method is: to generate all possible permutations, filtering on the arrangement of duplicate, get the combination */function huoqu_ Zhuhe ($eq, $jiashu, $isone =1) {if (empty ($jiashu) | |! Is_array ($jiashu)) {echo ' ERROR: Addend must array '; return false;} $feishu =0;for ($i =0; $i
 
  $EQ) Break;else if (($nowhe + $jiashu [$j]) = = $eq) {$savearr []= $savestr;} else{$newarr [$k]= $savestr; $k + +;}} End for ($j =0; $j
  
   
  
 

The results of the operation are as follows:

Array (  [0] = 3+8+9  [1] = 4+7+9  [2] = 5+6+9  [3] = = 5+7+8  [4] = = 1+2+8+9  [5] => ; 1+3+7+9  [6] = 1+4+6+9  [7] = 1+4+7+8  [8] = = 1+5+6+8  [9] = = 2+3+6+9  [ten] = 2+3+7+8< C11/>[11] = 2+4+5+9  [[] = 2+4+6+8  [] = 2+5+6+7  [+] = 3+4+5+8  [] = 3+4+6+7< C16/>[16] = 1+2+3+5+9  [+] = 1+2+3+6+8  [+] = 1+2+4+5+8  [+] = 1+2+4+6+7  [+] = 1+3+4+5+7  [+] = 2+3+4+5+6)

I hope this article is helpful to everyone's PHP programming.

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