组合第二弹问题求助..

黄袍披身 2011-05-31 05:04:29

11 22 33
44 55 66
77 88 99

要得到

11 44 77
11 44 88
11 44 99
11 55 77
11 55 88
11 55 99
...
22 44 77
22 44 88
...
33 44 77
..

如此类推的函数...感冒了,脑子动不了了...感谢.

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ulpyuxa 2011-06-04

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其实就是用几个循环就OK了。

wbandzlhgod 2011-05-31

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哈哈哈学习啦!!!

记住 ---- 笛卡儿积

一起混吧 2011-05-31

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        $arr1=array('11','22','33');

	$arr2=array('44','55','66');

	$arr3=array('77','88','99');

 function get($arr1,$arr2,$arr3){

	foreach($arr1 as $val){

	    foreach($arr2 as $val2){

		   foreach($arr3 as $val3){

                       $newarr[]=array($val,$val2,$val3);	

		   } 

	    }

	

	}

	foreach($newarr as $v){

	    $arr[]=join(' ',$v);

	}

	return $arr;

 }

	print_r(get($arr1,$arr2,$arr3));

Array
(
[0] => 11 44 77
[1] => 11 44 88
[2] => 11 44 99
[3] => 11 55 77
[4] => 11 55 88
[5] => 11 55 99
[6] => 11 66 77
[7] => 11 66 88
[8] => 11 66 99
[9] => 22 44 77
[10] => 22 44 88
[11] => 22 44 99
[12] => 22 55 77
[13] => 22 55 88
[14] => 22 55 99
[15] => 22 66 77
[16] => 22 66 88
[17] => 22 66 99
[18] => 33 44 77
[19] => 33 44 88
[20] => 33 44 99
[21] => 33 55 77
[22] => 33 55 88
[23] => 33 55 99
[24] => 33 66 77
[25] => 33 66 88
[26] => 33 66 99
)

黄袍披身 2011-05-31

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[Quote=引用 3 楼 xuzuning 的回复:]

这是一个求笛卡尔积的题目，比你第一问描述的清楚的多
PHP code
$a = array(11, 22, 33);
$b = array(44, 55, 66);
$c = array(77, 88, 99);

function Descartes($a, $b) {
$r = array();
if(is_array($a)) foreach($a as $v) $r =……
[/Quote]
小弟不才，受教了

xuzuning 2011-05-31

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这是一个求笛卡尔积的题目，比你第一问描述的清楚的多

$a = array(11, 22, 33);

$b = array(44, 55, 66);

$c = array(77, 88, 99);





function Descartes($a, $b) {

  $r = array();

  if(is_array($a)) foreach($a as $v) $r = array_merge($r, Descartes($v, $b));

  elseif(is_array($b)) foreach($b as $v) $r = array_merge($r, Descartes($a, $v));

  else $r[] = "$a $b";

  return $r;

}

print_r( Descartes( Descartes($a, $b), $c ) );

乌镇程序员 2011-05-31

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$a = array(11,22,33);

$b = array(44,55,66);

$c = array(77,88,99);

$str = '';

echo "<pre>";

foreach($a as $v1) {

   foreach($b as $v2) {

      foreach($c as $v3) $str .= "{$v1} {$v2} {$v3}\n";

   }

}

echo $str;