PHP - 访问多维数组的数据

Question

我试图访问多维数组中的数据。我需要获取这些数据(EC000001, EG000017, EN, EF007220)的值，但我在PHP中的foreach循环中苦苦挣扎，尤其是当需要嵌套foreach时，请你帮我解决一下访问想要的数据吗？

我需要循环遍历所有$ c然后循环以获取所有需要的数据。这是我之前收集的值EC000001，但我相信有更好的解决方案。

   foreach ($c as $classCodes => $value) {

    $classCode = key($c[$classCodes]); //classCode -> EC000001
}

阵列结构：

Array
(
    **[EC000001]** => Array
        (
            [0] => **EG000017**
            [1] => Array
                (
                    [0] => Array
                        (
                            [0] => **EN**
                            [1] => Busbar terminal
                        )
                    [1] => Array
                        (
                            [0] => **nl-NL**
                            [1] => Aansluitklem stroomrail
                        )
                )

            [2] => Array
                (
                    [0] => Array
                        (
                            [0] => **EF007220**
                            [1] => EU570448
                            [2] => Array
                                (
                                )
                        )

                    [1] => Array
                        (
                            [0] => EF007219
                            [1] => EU570448
                            [2] => Array
                                (
                                )
                        )

                    [2] => Array
                        (
                            [0] => EF000073
                            [1] => 
                            [2] => Array
                                (
                                    [0] => EV009241
                                    [1] => EV009472
                                )
                        )

                    [3] => Array
                        (
                            [0] => EF007092
                            [1] => EU570448
                        )

                    [4] => Array
                        (
                            [0] => EF004969
                            [1] => EU570126     
                        )
                )
        )

)

Answer 1

我无法测试它，但你可以在循环中尝试这个：

$value[0];       // -> 1
$value[1][0][0]; // -> 2
$value[1][1][1]; // -> 3

Answer 2

$EG000002Array[0][EG000001][0]

$EG000002Array[0][EG000001][1][0]

$EG000002Array[0][EG000001][1][1][1]

Answer 3

有很多方法可以从多维数组中获取数组值

例如使用foreach（）：

    $flavors = array('Japanese' => array('hot' => 'wasabi',
                                     'salty' => 'soy sauce'),
                 'Chinese'  => array('hot' => 'mustard',
                                     'pepper-salty' => 'prickly ash'));

// $culture is the key and $culture_flavors is the value (an array)
foreach ($flavors as $culture => $culture_flavors) {

    // $flavor is the key and $example is the value
    foreach ($culture_flavors as $flavor => $example) {
        print "A $culture $flavor flavor is $example.\n";
    }
}

或使用for（）：

$specials = array( array('Chestnut Bun', 'Walnut Bun', 'Peanut Bun'),
                   array('Chestnut Salad','Walnut Salad', 'Peanut Salad') );

// $num_specials is 2: the number of elements in the first dimension of $specials
for ($i = 0, $num_specials = count($specials); $i < $num_specials; $i++) {
    // $num_sub is 3: the number of elements in each sub-array
    for ($m = 0, $num_sub = count($specials[$i]); $m < $num_sub; $m++) {
        print "Element [$i][$m] is " . $specials[$i][$m] . "\n";
    }
}

输出应该像：

Element [0][0] is Chestnut Bun
Element [0][1] is Walnut Bun
Element [0][2] is Peanut Bun
Element [1][0] is Chestnut Salad
Element [1][1] is Walnut Salad
Element [1][2] is Peanut Salad

Answer 4

您可以使用递归和正则表达式检查它是否加粗:)

请注意，我们将&放入$classCodes以通过引用传递它，而不是通过值传递它。

功能：

function get_bolded_data($c, &$classCodes = array()){
    foreach($c as $k1 => $v1){
        if(is_array($v1)){
            //If $v1 is an array we call get_bolded_data() again and pass 
            //$v1 and $classCode
            get_bolded_data($v1,$classCodes);
        }else if(preg_match("/(\*\*).*(\*\*)/", $v1)){
            $classCodes[] = $v1;
        }
    }
}

用法：

$classCodes = array();
$c = array(
    0 => array(
        '**EC000001**' => array(
            0 => '**EG000017**',
            1 => array(
                0 => array(
                    0 => '**EN**',
                    1 => 'Busbar terminal'
                ) ,
                1 => array(
                    0 => '**nl-NL**',
                    1 => 'Aansluitklem stroomrail'
                )
            ) ,
            2 => array(
                0 => array(
                    0 => '**EF007220**',
                    1 => 'EU570448',
                    2 => array()
                ) ,
                1 => array(
                    0 => 'EF007219',
                    1 => 'EU570448',
                    2 => array()
                ) ,
                2 => array(
                    0 => 'EF000073',
                    1 => '',
                    2 => array(
                        0 => 'EV009241',
                        1 => 'EV009472'
                    )
                ) ,
                3 => array(
                    0 => 'EF007092',
                    1 => 'EU570448'
                ) ,
                4 => array(
                    0 => 'EF004969',
                    1 => 'EU570126'
                )
            )
        )
    )
);
//Call our function
get_bolded_data($c, $classCodes);

这是var_dump的结果：

array(4) {
  [0]=>
  string(12) "**EG000017**"
  [1]=>
  string(6) "**EN**"
  [2]=>
  string(9) "**nl-NL**"
  [3]=>
  string(12) "**EF007220**"
}