doumeng3345
2017-04-30 20:24
浏览 89
已采纳

具有动态参数长度的array_intersect（）

I've got an array of arrays that may have a different count of elements when the script is run. 

$strict = [
    [0] => ['one', 'two', 'three', 'four'],
    [1] => ['one', 'two', 'four', 'eight'],
    [2] => ['two', 'four', 'ten', 'twenty'],
 /* [x] => [. . .] */
];

$result = array_intersect($strict[0], $strict[1], $strict[2]);
print_r($result); //shows ['two', 'four'];

I want to do something like this though: 

$result = array_intersect($strict);

Where I pass in a dynamic length array of arrays and array_intersect will go through each one and take only the common entries.

Doing array_intersect($strict) does not work, because the function requires at least two arguments.

Maybe something like

array_intersect(function ($array) {
    $list = '';
    foreach ($array as $el) {
        $list .= $el.',';
    }

    $list = rtrim($list, ',');

    return eval($list);
});

though this particular method still throws the error

Warning: array_intersect(): at least 2 parameters are required, 1 given

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我有一个数组数组，在运行脚本时可能有不同的元素数。 

  $ strict = [
 [0] =＆gt;  ['one'，'two'，'three'，'four']，
 [1] =＆gt;  ['one'，'two'，'four'，'eight']，
 [2] =＆gt;  ['two'，'four'，'ten'，'twenty']，
 / * [x] =＆gt;  [  。  。] * / 
]; 
 
 $ result = array_intersect（$ strict [0]，$ strict [1]，$ strict [2]）; 
print_r（$ result）;  //显示['two'，'four']; 
   
 
 
我想做类似这样的事情： 
 
 
   $ result = array_intersect（$ strict）; 
   
 
 
我传入一个动态长度的数组数组，而 array_intersect 将会去 通过每一个，只采取共同的条目。   
 
 
执行 array_intersect（$ strict）不起作用，因为该函数至少需要两个参数。   
 
 
可能像 
 
 
  array_intersect（function（$ array）{
 $ list =''; 
 foreach（$ array） 如$ el）{
 $ list。= $ el。'，'; 
} 
 
 $ list = rtrim（$ list，'，'）; 
 
返回eval（$ list）; \  n}）; 
   
 
 
虽然这个特殊的方法仍然会抛出错误 
 
 
 
 
警告：array_intersect（）  ：至少需要2个参数，1 
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2条回答 默认 最新

  • duanhe8280 2017-04-30 20:35
    已采纳

    You can use call_user_func_array:

    Call a callback with an array of parameters

    So your callback would be array_intersect, and you could pass your array like this:

    $result = call_user_func_array('array_intersect', $strict);
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  • douhuang9886 2017-04-30 20:52

    You can take advantage of modern PHP's array packing/unpacking features - aka variadics, or the so-called "splat" (...) operator - as well:

    $result = array_intersect(...$strict);
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