Q35178357/how-to-get-array-data-by-key-value

<?php // http://stackoverflow.com/questions/35178357/how-to-get-array-data-by-key-value-from-multidimensional-array
// include __DIR__ .'/__bootstrap__.php';

$a = Array(
    "type" => "salesrule/rule_condition_combine",
    'id' => 'root',
    "attribute" => "",
    "operator" => "",
    "value" => "1",
    "is_value_processed" => "",
    "aggregator" => "any",
    "conditions" => Array
        (
            "0" => Array
                (
                    "type" => "salesrule/rule_condition_combine",
                    "attribute" => "",
                    'id' => 'lvl__1--0',
                    "operator" => "",
                    "value" => "1",
                    "is_value_processed" => "",
                    "aggregator" => "all",
                    "conditions" => 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
                (
                    "type" => "salesrule/rule_condition_combine",
                    "attribute" => "",
                     'id' => 'lvl__1--1',
                    "operator" => "",
                    "value" => "1",
                    "is_value_processed" => "",
                    "aggregator" => "all",
                    "conditions" => 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" => "",
                                )
                        )
                )
        )
);

echo 'test data start', PHP_EOL;
print_r($a);
echo 'test data end', PHP_EOL;

// 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;
// --------------------------------------------------------------------------

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

        if (   isset($condition['attribute'])
             && $condition['attribute']  === 'postcode') {
            $currentPostcodes[] = $condition;
        }
    }

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