如何过滤多维数组并创建一个新数组

Question

我有这种数组，基于页面 ID，例如：32,143。

我想搜索数组键position中是否有两个值，然后忽略prepend和append值，只考虑这两个值。

如果该数组没有两个值和多个前置和append值，那么它将根据priority键考虑。

$sort_result = Array
(
    [32] => Array
        (
            [0] => Array
                (
                    [page] => 32
                    [position] => append
                    [priority] => 1
                )

            [1] => Array
                (
                    [page] => 32
                    [position] => append
                    [priority] => 2
                )

            [2] => Array
                (
                    [page] => 32
                    [position] => prepend
                    [priority] => 3
                )

            [3] => Array
                (
                    [page] => 32
                    [position] => both
                    [priority] => 3
                )

            [4] => Array
                (
                    [page] => 32
                    [position] => prepend
                    [priority] => 4
                )

        )

    [143] => Array
        (
            [0] => Array
                (
                    [page] => 143
                    [position] => prepend
                    [priority] => 19
                )
            [1] => Array
                (
                    [page] => 143
                    [position] => prepend
                    [priority] => 18
                )
            [2] => Array
                (
                    [page] => 143
                    [position] => append
                    [priority] => 18
                )

        )

)

我尝试了以下代码，但无法正常工作：

<?php 
foreach ( $modify_array as $key => $value ) {
    foreach( $value as $k1 => $v1) {
        if ( array_search( "both", $v1 ) ) {
            $final_array[$key][$k1] = $v1;
        } else{
            if ( array_search( "prepend", $v1 ) ) {
                $final_array[$key][$k1] = $v1;
            }
            if ( array_search( "append", $v1 ) ) {
                $final_array[$key][$k1] = $v1;
            }
           
        }
     break;
    }
}

我期待 output 像这样：

Array
(
    [32] => Array
        (
            
            [3] => Array
                (
                    [page] => 32
                    [position] => both
                    [priority] => 3
                )

        )

    [143] => Array
        (
            [1] => Array
                (
                    [page] => 143
                    [position] => prepend
                    [priority] => 18
                )
            [2] => Array
                (
                    [page] => 143
                    [position] => append
                    [priority] => 18
                )

        )

)

编辑1：

我设法工作，使用这段代码

$modify_array = array();
foreach ( $sort_result as $sort_result_key => $sort_result_value ) {  
    $modify_array[$sort_result_value['page']][] = $sort_result_value;
}

foreach ( $modify_array as $key => $value ) {

    $filter_array[$key]['both_yes'] = array_keys(array_column($value, 'position'),'both');
    $filter_array[$key]['prepend_yes'] = array_keys( array_column($value, 'position'),'prepend');
    $filter_array[$key]['append_yes'] = array_keys(array_column($value, 'position'),'append');

} 
    

foreach ( $filter_array as $filter_array_key => $filter_array_value ) {
    if ( ! empty( $filter_array_value['both_yes'])) {
        $a = $filter_array_value['both_yes'][0];
        $final_array[] = $modify_array[$filter_array_key][$a];
        
    } else {
        if ( ! empty( $filter_array_value['prepend_yes'])) {
            $b = $filter_array_value['prepend_yes'][0];
            $final_array[] = $modify_array[$filter_array_key][$b];
        }
        if ( ! empty( $filter_array_value['append_yes'])) {
            $c = $filter_array_value['append_yes'][0];
            $final_array[] = $modify_array[$filter_array_key][$c];
        }
    }
}

编辑 2： var_export

 array ( 32 => array ( 0 => array ( 'page' => '32', 'position' => 'append', 'priority' => '1', ), 1 => array ( 'page' => '32', 'position' => 'append', 'priority' => '2', ), 2 => array ( 'page' => '32', 'position' => 'prepend', 'priority' => '3', ), 3 => array ( 'page' => '32', 'position' => 'both', 'priority' => '3', ), 4 => array ( 'page' => '32', 'position' => 'prepend', 'priority' => '4', ), ), 143 => array ( 0 => array ( 'page' => '143', 'position' => 'prepend', 'priority' => '18', ), 1 => array ( 'page' => '143', 'position' => 'append', 'priority' => '18', ), 2 => array ( 'page' => '143', 'position' => 'prepend', 'priority' => '19', ), ), )

Answer 1

我认为我可以将此任务归结为使用输入数组的 1 个完整循环，然后使用嵌套循环的分组数据循环来隔离具有最低优先级值的行的最低时间复杂度。

第一个循环进行分组，并可能为节省 memory 的微不足道的费用而摆脱毫无价值non-both行。

第二个循环迭代page组，然后内部循环支持both行，如果没有两行，则仅使用non-both both行。 if和elseif确保仅保留具有最低优先级编号的行。 我添加了一个rsort()调用，假设您希望在prepend行之前append行。 如果不需要优先考虑 position 值，则省略包含rsort()调用的条件块。

代码：（演示）

$array = [
    ['page' => '32', 'position' => 'append', 'priority' => '1'],
    ['page' => '32', 'position' => 'append', 'priority' => '2'],
    ['page' => '32', 'position' => 'prepend', 'priority' => '3'],
    ['page' => '32', 'position' => 'both', 'priority' => '3'],
    ['page' => '32', 'position' => 'prepend', 'priority' => '4'],
    ['page' => '143', 'position' => 'prepend', 'priority' => '18'],
    ['page' => '143', 'position' => 'append', 'priority' => '18'],
    ['page' => '143', 'position' => 'prepend', 'priority' => '19'],
];

$result = [];
foreach ($array as $row) {
    if (!isset($result[$row['page']])) {
        $result[$row['page']] = ['both' => [], 'non-both' => []];
    }
    if ($row['position'] !== 'both') {
        if ($result[$row['page']]['both']) {
            continue; // nothing worth doing in this case, ignore the row
        } else {
            $result[$row['page']]['non-both'][] = $row;
        }
    } else {
        $result[$row['page']]['both'][] = $row;
    }
}

foreach ($result as $page => $rows) {
    $keep = [];
    foreach ($rows['both'] ?: $rows['non-both'] as $row) {
        if (!$keep || $row['priority'] < $keep[0]['priority']) {
            $keep = [$row];
        } elseif ($row['priority'] === $keep[0]['priority']) {
            $keep[] = $row;
        }
    }
    if ($keep[0]['position'] !== 'both') {
        rsort($keep);  // assuming you need prepend to occur before append
    }
    $result[$page] = $keep;
}
var_export($result);