在 explode() 创建的多维数组上插入重复值

Question

这是我的脚本及其背后的逻辑

////There's some more stuff right here but it's not really relevant. Right now 
////Because I'm doing tests i'm doing I'm limiting it to 3 posts in `$my_query`

//create empty arrays before loop to initialize array
$array = array();

//start loop (each contains a my way of getting a new url)
while ($my_query->have_posts()) : $my_query->the_post();

//misc stuff to get the URL, SKU and ID
$post_id = get_the_ID();
$product = wc_get_product(get_the_ID());
$title = $product->get_title();
$sku = $product->get_sku();
$sku_id = $sku . '_' . $post_id;
$urltitle = urlencode($title);

//assign url
$url = 'http://www.example.com/search?=' . $urltitle;

//Using CURL to get HTML from $url
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, surl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$html = curl_exec($ch);
curl_close($ch);

$dom = new DOMDocument();

@$dom->loadHTML($html);

//retreive links from loaded html
foreach($dom->getElementsByTagName('a') as $link) {

//search nodeValue's for something specific in string
if (strpos($link->nodeValue, 'Over $') !== false) {

    //nodeValue found. Start counter and make $f not empty
    $f = 1;
                                                  }
        //$f is now not empty
        if (!empty($f)) {

                //Starting at nodeValue's immediately after 'Over $'
                if ($f > 1) {

                        //Put nodeValue's in $array along with corresponding $sku and $id
                        $array[] .= $link->nodeValue . '|' . $sku_id;

                            }
//increment $f by +1 once $f is not empty
$f++;
}

//we only want the first 4 values after the searched text was found ($f = 2, 3, 4 and 5)
if ($f == 6) {
                        break;
}

//end foreach loop         
}

//make $f empty again so it remains false at beginning of while loop (don't completely understand this but I was having issues without it)
$f = NULL;

//end loop. Start again.
endwhile;

循环后数组存储我获得的值并输出正常。

Array
(
    [0] => Motor Vehicle Wheel Parts|SKU1_9545
    [1] => Motor Vehicle Suspension Parts|SKU1_9545
    [2] => CarParts.com|SKU1_9545
    [3] => Auto Parts Train|SKU1_9545
    [4] => Automotive Rims & Wheels|SKU2_8564
    [5] => Motor Vehicle Suspension Parts|SKU2_8564
    [6] => Under 16 inch|SKU2_8564
    [7] => 16 – 18 inch|SKU2_8564
    [8] => Motor Vehicle Wheel Parts|SKU3_7589
    [9] => Motor Vehicle Suspension Parts|SKU3_7589
    [10] => McGard|SKU3_7589
    [11] => Rugged Ridge|SKU3_7589
)

因为我在两边都有重复的键和值，所以我需要把它变成一个多维数组，以 $sku_id 作为父数组。

这是我收集的：

foreach ($array as $key => $level):
        $explode = explode('|', $level);
       foreach ($itemprods as $k =>$attribute):
           $explode = explode('|', $attribute);
             $variables[$explode[1]][] = $explode[0];
       endforeach;
endforeach;

这似乎有点效果，因为 $variables 的输出是

有没有更有效的方法来做到这一点？多维数组中的所有值都是正确的，我只需要想办法去除每个维度中的重复值。

我希望实现的最终结果如下所示

Array
(
    [SKU1_9545] => Array
        (
            [0] => Motor Vehicle Wheel Parts
            [1] => Motor Vehicle Suspension Parts
            [2] => CarParts.com
            [3] => Auto Parts Train
        )

    [SKU2_8564] => Array
        (
            [0] => Automotive Rims & Wheels
            [1] => Motor Vehicle Suspension Parts
            [2] => Under 16 inch
            [3] => 16 – 18 inch
        )

    [SKU3_7589] => Array
        (
            [0] => Motor Vehicle Wheel Parts
            [1] => Motor Vehicle Suspension Parts
            [2] => McGard
            [3] => Rugged Ridge
        )

)

Answer 1

所以这个位：

foreach ($itemprods as $k =>$attribute):
    $explode = explode('|', $attribute);
    $variables[$explode[1]][] = $explode[0];

添加签到

foreach ($itemprods as $k =>$attribute):
    $explode = explode('|', $attribute);
    if( !isset($variables[$explode[1]]) || array_search($explode[0], $variables[$explode[1]]) === false)
         $variables[$explode[1]][] = $explode[0];

http://php.net/manual/en/function.array-search.php

array_search — Searches the array for a given value and returns the first corresponding key if successful

请注意 === false 这意味着（额外 =）还要检查类型。这是必要的，因为 array_search returns 可以是 0 和 0 的索引也是 false 但它不是 "boolean" false .所以这会阻止添加项目，如果搜索表明它是数组中的第一个元素，即索引 0.

文档中给出了这个警告：

Warning This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

或者你可以运行 array_unique但这需要在编译多维数组后进行循环。

  foreach( $variables as &$array){
     $array = array_unique($array);
  }

as &$array中的&是通过引用传递的，所以我们可以在不创建新数组的情况下更新数组。

最后一种方法 是滥用键是唯一的这一事实，并使用与其值匹配的键创建嵌套数组：

foreach ($itemprods as $k =>$attribute):
    $explode = explode('|', $attribute);
    if(!isset($variables[$explode[1]]) || !isset($variables[$explode[1]][$explode[0]]))
         $variables[$explode[1]][$explode[0]] = $explode[0];

最后一个是最快的，因为 isset 不执行函数调用。但是你最终得到这样一个数组：

[SKU1_9545] => Array
    (
        [Motor Vehicle Wheel Parts] => Motor Vehicle Wheel Parts
        [Motor Vehicle Suspension Parts] => Motor Vehicle Suspension Parts
        [CarParts.com] => CarParts.com
        [Auto Parts Train] => Auto Parts Train
    )

您可以使用 array_values 像 array_values($array['SKU1_9545']) 那样删除键，但这有点违背了目的。

更新

正如您在评论中提到的，对于我提到的第一种也是最后一种方式，您应该首先检查是否设置了主数组。

 if( !isset($variables[$explode[1]]) || ... )

当 PHP 看到 OR 的第一部分为真时，它不会评估第二部分，因为整个条件都为真。所以先检查那个然后再检查另一个很重要。所以我们可以检查OR，因为如果没有设置主嵌套数组，肯定其中的元素还不能重复。

Answer 2

假设这是输入数组：

$array = Array(
                "0" => "Motor Vehicle Wheel Parts|SKU1_9545",
                "1" => "Motor Vehicle Suspension Parts|SKU1_9545",
                "2" => "CarParts.com|SKU1_9545",
                "3" => "Auto Parts Train|SKU1_9545",
                "4" => "Automotive Rims & Wheels|SKU2_8564",
                "5" => "Motor Vehicle Suspension Parts|SKU2_8564",
                "6" => "Under 16 inch|SKU2_8564",
                "7" => "16 – 18 inch|SKU2_8564",
                "8" => "Motor Vehicle Wheel Parts|WS49X4_9874",
                "9" => "Motor Vehicle Suspension Parts|WS49X4_9874",
                "10" => "McGard|WS49X4_9874",
                "11" => "Rugged Ridge|WS49X4_9874"
               );

然后您可以像这样使用 result array 和 array_key_exists()：

$results = array();     // array to keep results

foreach($array as $key => $value)
{
    $explode = explode('|', $value);             // exlpode the value

    if(!array_key_exists($explode[1], $results)) // check if key already exists in results
    {
        $results[$explode[1]] = array();       // if not make a new key
    }

    array_push($results[$explode[1]], $explode[0]);  // push a value to the key
}

print_r($results);

将输出：

Array ( 
        [SKU1_9545] => Array ( [0] => Motor Vehicle Wheel Parts 
                               [1] => Motor Vehicle Suspension Parts 
                               [2] => CarParts.com 
                               [3] => Auto Parts Train
                             )
        [SKU2_8564] => Array ( [0] => Automotive Rims & Wheels
                               [1] => Motor Vehicle Suspension Parts
                               [2] => Under 16 inch [3] => 16 – 18 inch
                             )
        [WS49X4_9874] => Array([0] => Motor Vehicle Wheel Parts
                               [1] => Motor Vehicle Suspension Parts
                               [2] => McGard
                               [3] => Rugged Ridge
                              )
      )

Answer 3

第二部分不需要两个循环。这对我有用：

$variables=[];
foreach ($myArray as $row){
     $explode = explode('|', $row);
     if (!in_array($explode[1],array_keys($variables))){
         $variables[$explode[1]]=[];
     }
     $variables[$explode[1]][] = $explode[0];
}

在 explode() 创建的多维数组上插入重复值

Duplicate Values Being Inserted on explode() created Multidimensional Array

php

arrays

curl

domdocument