那些遇到过的问题

PHP - 在给定childs键名时,递归地将每个数组元素的键设置为子元素的值

Tar*_*nes 12 php arrays recursion pass-by-reference multidimensional-array

我将首先展示一个非递归的例子

非递归示例 

$given_key_name = 'site_id';

$rows[] = array(
    'site_id' => '0',
    'language_id' => '1',
    'name' => 'sitename',
    'description' =>'site desc',
);

$results = array();
foreach($rows as $row){
    $key_value = $row[$given_key_name];
    unset($row[$given_key_name]);
    $results[$key_value] = $row;
}

//  OR This method is faster than the forloop

$results = array_combine(array_column($rows, $given_key_name),$rows);
foreach($results as &$row){
    unset($row[$given_key_name]); 
}
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$results 等于

$results[0] = array( 
    'language_id' => '1',
    'name' => 'sitename',
    'description' =>'site desc',
);
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很简单,键名已设置为给定子元素的值.但我希望能够通过使用多个键名来嵌套和删除.

例

$given_key_names = array('site_id', 'language_id');

在这种情况下,所需的结果将是.

$results[0][1] = array( 'name' => 'sitename', 'description' =>'site desc', );

说明

第一个键值已用作$ results数组中的第一个键,并创建一个新的空数组作为其值. $results[0] = array();

由于存在第二个键,因此将其值设置为新创建的数组的键,其值也是新的空数组.$results[0][1] = array();

由于没有其他键,空数组将填充其余值

$results[0][1] = array( 'name' => 'sitename', 'description' =>'site desc', );

所以我想要两个功能nestByKeyNames和unNestByKeyName.

NestByKeyNames函数

基督徒答案解决了这个问题

function nestByKeyNames($arrayRows, $arrayKeyOrder){

    // Prepare resulting array
    $arrayResult = array();

    // Cycle the input array
    foreach($arrayRows as $someRow){
        // We will acomplish this using references
        $current = &$arrayResult;

        // get the current level
        foreach($arrayKeyOrder as $someKey){
            $someValue = $someRow[$someKey];
            if(isset($current[$someValue])){
                $current = &$current[$someValue];
            }else{
                $current[$someValue] = array();
                $current = &$current[$someValue];
            }
            unset($someRow[$someKey]);
        }
        $current = $someRow;
    }
    return $arrayResult;
}
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我想知道是否array_combine(array_column($arrayRows, $key_name),$arrayRows);可以使用而不是第一次迭代来提高性能？

这表示mysql select语句的结果.

$rows = array(
    array(
        'pri_id_1' =>1,
        'pri_id_2' =>1,
        'pri_id_3' =>1,
        'col_1' =>'col_value_1111',
        'col_2' =>'col_value_1112',
        'col_3' =>'col_value_1113',
    ),
    array(
        'pri_id_1' =>1,
        'pri_id_2' =>2,
        'pri_id_3' =>1,
        'col_1' =>'col_value_1211',
        'col_2' =>'col_value_1212',
        'col_3' =>'col_value_1213',
    ),
    array(
        'pri_id_1' =>1,
        'pri_id_2' =>3,
        'pri_id_3' =>1,
        'col_1' =>'col_value_1311',
        'col_2' =>'col_value_1312',
        'col_3' =>'col_value_1313',
    )
);

$keyNames = array('pri_id_1','pri_id_2','pri_id_3');
$results = nestByKeyNames($rows, $keyNames);
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生成以下输出 

Array
(
    [1] => Array
        (
            [1] => Array
                (
                    [1] => Array
                        (
                            [col_1] => col_value_1111
                            [col_2] => col_value_1112
                            [col_3] => col_value_1113
                        )

                )

            [2] => Array
                (
                    [1] => Array
                        (
                            [col_1] => col_value_1211
                            [col_2] => col_value_1212
                            [col_3] => col_value_1213
                        )

                )

            [3] => Array
                (
                    [1] => Array
                        (
                            [col_1] => col_value_1311
                            [col_2] => col_value_1312
                            [col_3] => col_value_1313
                        )

                )

        )

)
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UnNestByKeyNames函数

unNestByKeyNames应该能够获取此输出并将其转换回原始数组,前提是它被赋予了键名. 基督徒答案并没有解决这个问题,因为它不能用一个关键名称,但我可以告诉它非常接近.

function unNestByKeyNames($arrayRows, $arrayKeyOrder){


}

$keyNames = array('pri_id_1','pri_id_2','pri_id_3');
$rows = unNestKeyNames($results, $keyNames);
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我的真正目标是从MYSQL SELECT语句中获取结果,并使用相同的命名约定填充表单nestByKeyNames.

例如

<input name="rows[1][1][1][col_1]" value="col_value_1" />
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然后INSERT首先使用将$ _POST请求转换回MYSQL 语句unNestByKeyNames.

从此我将创建一个INSERT声明.

function returnValues($rows, $column_names){

    //validation has been removed for clarity

    $implode_VALUES = array();

    foreach ($rows as $key => $row) {
        $implode_row_values = array();
        foreach ($column_names as $column_name) {
            $implode_row_values[$column_name] = $row[$column_name];
        }
        if($implode_row_values){
            $implode_VALUES[] = " ('" . implode("','", $implode_row_values) . "') ";
        }
    }
    return $implode_VALUES;
}

$implode_COLUMNS = array('pri_id_1','pri_id_2','pri_id_3','col_1','col_2','col_3');

$implode_VALUES = returnValues($rows, $implode_COLUMNS)

$sql = "INSERT INTO table_name (" . implode(',', $implode_COLUMNS) . ") VALUES " . implode(',', $implode_VALUES);
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最终的结果应该像这样生成一个sql语句

INSERT INTO table_name (pri_id_1,pri_id_2,pri_id_3,col_1,col_2,col_3) VALUES ('1','1','1','NEW_value_1111','NEW_value_1112','NEW_value_1113') , ('1','2','1','NEW_value_1211','NEW_value_1212','NEW_value_1213') , ('1','3','1','NEW_value_1311','NEW_value_1312','NEW_value_1313')

我想要什么

  • 关于'nestByKeyNames'功能的改进建议(性能/是否有错误)
  • 帮助生成'unNestByKeyNames'代码
  • 关于我的'$ rows to mysql INSERT'方法的改进建议
  • 我如何使我的任何代码表现更好的例子.

Chr*_*ian 5

这比我想象的要棘手,但我相信我有一个凌乱的解决方案.

首先,这是我正在使用的数据.dumpr是一种格式var_dump更好的自定义功能.

$arrayKeyOrder = array(
    'site_id',
    'language_id'
);

$original = array(
    array(
        'site_id' => '0',
        'language_id' => '1',
        'name' => 'sitename',
        'description' =>'site desc',
    ),

    array(
        'site_id' => '0',
        'language_id' => '2',
        'name' => 'sitename',
        'description' =>'site desc',
    ),

    array(
        'site_id' => '1',
        'language_id' => '1',
        'name' => 'sitename',
        'description' =>'site desc',
    ),

    array(
        'site_id' => '2',
        'language_id' => '1',
        'name' => 'sitename',
        'description' =>'site desc',
    ),
);

$zipped = doZip($original, $arrayKeyOrder);
$unzipped = unZip($zipped, $arrayKeyOrder);

dumpr($original);
dumpr($zipped);
dumpr($unzipped);
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这是zip和unzip功能:

function doZip($arrayRows, $arrayKeyOrder){

    // Prepare resulting array
    $arrayResult = array();

    // Cycle the input array
    foreach($arrayRows as $someRow){
        // We will acomplish this using references
        $current = &$arrayResult;

        // get the current level
        foreach($arrayKeyOrder as $someKey){
            $someValue = $someRow[$someKey];
            if(isset($current[$someValue])){
                $current = &$current[$someValue];
            }else{
                $current[$someValue] = array();
                $current = &$current[$someValue];
            }
            unset($someRow[$someKey]);
        }

        $current = $someRow;
    }

    return $arrayResult;
}


function unZip($arrayRows, $arrayKeyOrder, $arrayValues = array(), $depth = 0){

    $arrayResults = array();

    if($depth < count($arrayKeyOrder)){
        foreach($arrayRows as $key => $value){
            $arrayValues[$depth] = $key;
            $arrayResults[] =  unZip($value, $arrayKeyOrder, $arrayValues, $depth + 1);
        }
    }else{
        $extra = array_combine($arrayKeyOrder, $arrayValues);
        $result = array_merge($extra, $arrayRows);
        return $result;
    }

    if($depth == 0){
        for($i = 1; $i < count($arrayKeyOrder); $i++){
            $arrayResults = call_user_func_array('array_merge', $arrayResults);
        }        
    }

    return $arrayResults;
}
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最后,这是输出.让我知道这是否是你要求的,以及它是否适用于更大的数据集.

/vhost/virtual/sandbox/public/index.php:54
array(4) {
    [0] = array(4) {
        [site_id] = string(1) "0"
        [language_id] = string(1) "1"
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
    [1] = array(4) {
        [site_id] = string(1) "0"
        [language_id] = string(1) "2"
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
    [2] = array(4) {
        [site_id] = string(1) "1"
        [language_id] = string(1) "1"
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
    [3] = array(4) {
        [site_id] = string(1) "2"
        [language_id] = string(1) "1"
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
}

/vhost/virtual/sandbox/public/index.php:55
array(3) {
    [0] = array(2) {
        [1] = array(2) {
            [name] = string(8) "sitename"
            [description] = string(9) "site desc"
        }
        [2] = array(2) {
            [name] = string(8) "sitename"
            [description] = string(9) "site desc"
        }
    }
    [1] = array(1) {
        [1] = array(2) {
            [name] = string(8) "sitename"
            [description] = string(9) "site desc"
        }
    }
    [2] = array(1) {
        [1] = array(2) {
            [name] = string(8) "sitename"
            [description] = string(9) "site desc"
        }
    }
}

/vhost/virtual/sandbox/public/index.php:56
array(4) {
    [0] = array(4) {
        [site_id] = int(1) 0
        [language_id] = int(1) 1
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
    [1] = array(4) {
        [site_id] = int(1) 0
        [language_id] = int(1) 2
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
    [2] = array(4) {
        [site_id] = int(1) 1
        [language_id] = int(1) 1
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
    [3] = array(4) {
        [site_id] = int(1) 2
        [language_id] = int(1) 1
        [name] = string(8) "sitename"
        [description] = string(9) "site desc"
    }
}
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