PHP数组:将每个子数组连接在一起(概率) [英] PHP Array: join each sub-array together (Probability)

问题描述

我只想找到更好的方法来做到这一点:

I want simply to find-out better way to do this:

$array = array(
    array('a', 'b', 'c'),
    array('e', 'f', 'g'),
    array('h', 'i', 'j', 'k', 'l')
);

目标是打印如下内容:

a e h
a e i
a e j
a e k
a e l

a f h
a f i
a f j
a f k
a f l

a g h
a g i
a g j
a g k
a g l

然后对b和c做同样的事情.

Then doing same for b and c.

foreach ($array[0] as $val1) {
    foreach ($array[1] as $val2) {
        foreach ($array[2] as $val3) {
            echo "$val1  $val2  $val3 \n";
        }
        echo "--------\n";
    }
}

我还试图动态创建上述代码，并使用eval执行它:

I also tried to create above code dynamically and execute it with eval:

$eval         = '
     $data =array();
     ';
$eval_blocks  = '';
$eval_foreach = '';
$eval_data    = '
    $data[] = ';
$looplength   = count($array);

for ($i = 0; $i < $looplength; $i++) {
    $eval_foreach .= '
     foreach($array[' . $i . '] as $val' . ($i + 1) . '){
     ';
    if (($i + 1) == $looplength) {
        $eval_data .= ' $val' . ($i + 1) . ';';
    } else {
        $eval_data .= ' $val' . ($i + 1) . ' ." ".';
    }
    $eval_blocks .= '
     }
     ';
}
$eval = $eval . $eval_foreach . $eval_data . $eval_blocks;
eval($eval);
print_r($data);

但是，我仍然希望找到更好的方法来做到这一点.

更新:

注意:$array是动态的，它可能包含两个或更多个子数组

Note: the $array is dynamic, It might contain two sub-array or more

推荐答案

这可以帮助您尝试这样

    class Test {
    // holds the combinations


     var $combinations= array(); 



    function getCombinations($batch, $elements, $i)  {
        if ($i >= count($elements)) {
            $this->combinations[] = $batch;
        } else {     
            foreach ($elements[$i] as $element) {
                $this->getCombinations(array_merge($batch, $element), $elements, $i + 1);
            }                       
        }
    }
}  

//测试一下！

$traits = array (
    array(
        array('Happy'),
        array('Sad'),
        array('Angry'),
        array('Hopeful')
    ),
    array(
        array('Outgoing'),
        array('Introverted')
    ),
    array(
        array('Tall'),
        array('Short'),
        array('Medium')
    ),
    array(
        array('Violent'),
        array('Quiet'),
        array('Psychotic')
    ),
    array(
        array('Handsome'),
        array('Plain'),
        array('Ugly')
    )
);

$test = new Test();
$start = array();
$test->getCombinations($start, $traits, 0);   
print_r($test->combinations);   

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