如何從多維數組按鍵值獲取數組數據？

Question

我在我的php變量中有一個多維數組，例如，

Array
(
    [type] => salesrule/rule_condition_combine
    [attribute] => 
    [operator] => 
    [value] => 1
    [is_value_processed] => 
    [aggregator] => any
    [conditions] => Array
        (
            [0] => Array
                (
                    [type] => salesrule/rule_condition_combine
                    [attribute] => 
                    [operator] => 
                    [value] => 1
                    [is_value_processed] => 
                    [aggregator] => all
                    [conditions] => Array
                        (
                            [0] => Array
                                (
                                    [type] => salesrule/rule_condition_address
                                    [attribute] => postcode
                                    [operator] => >
                                    [value] => 00999
                                    [is_value_processed] => 
                                )

                            [1] => Array
                                (
                                    [type] => salesrule/rule_condition_address
                                    [attribute] => postcode
                                    [operator] => <
                                    [value] => 96200
                                    [is_value_processed] => 
                                )
                        )
                )
            [1] => Array
                (
                    [type] => salesrule/rule_condition_combine
                    [attribute] => 
                    [operator] => 
                    [value] => 1
                    [is_value_processed] => 
                    [aggregator] => all
                    [conditions] => Array
                        (
                            [0] => Array
                                (
                                    [type] => salesrule/rule_condition_address
                                    [attribute] => postcode
                                    [operator] => >=
                                    [value] => 97000
                                    [is_value_processed] => 
                                )

                            [1] => Array
                                (
                                    [type] => salesrule/rule_condition_address
                                    [attribute] => postcode
                                    [operator] => <
                                    [value] => 99500
                                    [is_value_processed] => 
                                )
                        )
                )
        )
)

在這里，數組的長度可以很長。 現在，我只想從數組中獲取郵政編碼值，例如，

Array(
     [0]=>Array
          ( 
             [0] => Array
                 (
                    [attribute] => postcode
                    [operator] => >
                    [value] => 00999
                  )
             [1] => Array
                 (
                    [attribute] => postcode
                    [operator] => <
                    [value] => 96200
                  )
          )
     [1]=>Array
          ( 
             [0] => Array
                 (
                    [attribute] => postcode
                    [operator] => >=
                    [value] => 97000
                  )
             [1] => Array
                 (
                    [attribute] => postcode
                    [operator] => <
                    [value] => 99500
                  )
          )
    )

我有多個循環和條件來執行此操作。

foreach( $conditions['conditions'] as $_conditions ):
    foreach( $_conditions['conditions'] as $_condition ):
        $counter++;
        $loopCounter++; 
        foreach($_condition['conditions'] as $condition ):
            if($condition['attribute'] == 'postcode'){ $postcodes[$counter][$condition['operator']] = $condition['value']; }
            $loopCounter++;
        endforeach;
    endforeach;
endforeach;

這行得通，但是我認為這不是正確的方法。 我還嘗試使用array_map()和array_column()以及其他一些方式，但是它們僅在我們具有一級子數組的情況下才有效。 基本上，我只想從此數組中獲取郵政編碼數據，而不使用多級循環。 任何幫助是極大的贊賞。

Answer 1

必需：從以數組形式保存的tree提取某些標識為“郵政編碼”的leaf nodes 。

有一個問題：

1）輸入數組“ root”是一個關聯的數組（“ condition”），而不是像樹的其余部分一樣的“ conditions”數組。 這說明了為什么我使用array（$ sourceData）而不是$ sourceData來開始處理。

evel.in上的演示Pastebin.com上的 源代碼

掃描數組的功能

/**
 * function recurse the array looking for post codes...
 *
 * @param array $conditions
 * @param array $postcodes by reference
 * @return void
 */
function getPostcodes($conditions, &$postcodes) {

    $currentPostcodes = array();

    foreach ($conditions as $condition) {

        if (!empty($condition['conditions'])) { // recurse...
           getPostcodes($condition['conditions'], $postcodes);
           continue; // process next entry...
        }

        // extract the postcodes...  
        if (   isset($condition['attribute'])
             && $condition['attribute']  === 'postcode') {
            $currentPostcodes[] = $condition;
        }
    }

    if (!empty($currentPostcodes)) {
        $postcodes[] = $currentPostcodes;
    }
    return;
}

運行：

// output in here
$postcodes = array();

// note: input needs to be an array that looks like a `condition_combine`

getPostcodes(array($a),  $postcodes);

echo 'output start', PHP_EOL;
print_r($postcodes);
echo 'output end', PHP_EOL;
exit;

輸出：

output start
Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [type] => salesrule/rule_condition_address
                    [attribute] => postcode
                    [id] => lvl__2--0
                    [operator] => >
                    [value] => 00999
                    [is_value_processed] => 
                )

            [1] => Array
                (
                    [type] => salesrule/rule_condition_address
                    [attribute] => postcode
                    [id] => lvl__2--1
                    [operator] => <
                    [value] => 96200
                    [is_value_processed] => 
                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [type] => salesrule/rule_condition_address
                    [attribute] => postcode
                    [operator] => >=
                    [id] => lvl__2--3
                    [value] => 97000
                    [is_value_processed] => 
                )

            [1] => Array
                (
                    [type] => salesrule/rule_condition_address
                    [attribute] => postcode
                    [id] => lvl__2--4
                    [operator] => <
                    [value] => 99500
                    [is_value_processed] => 
                )
        )
)
output end