PHP - 重新格式化多维数组以插入 MYSQL？答案

【问题标题】：PHP - reformat multidimensional array to insert into MYSQL?PHP - 重新格式化多维数组以插入 MYSQL？
【发布时间】：2011-03-22 16:26:39
【问题描述】：

我怎样才能像这样解析 php 数组：

$cars= array(
    "Ford"=>array("C-Max"=>array("length"=>"4333","width"=>"1825","height"=>"1560"),"Escape"=>array("length"=>"4480","width"=>"1845","height"=>"1730")
    ,"Explorer"=>array("length"=>"4912","width"=>"1872","height"=>"1849"),"Fiesta"=>array("length"=>"3950","width"=>"1973","height"=>"1433")
    ,"Focus"=>array("length"=>"4488","width"=>"1840","height"=>"1497"),"Fusion"=>array("length"=>"4013","width"=>"1724","height"=>"1543")
    ,"Galaxy"=>array("length"=>"4820","width"=>"1854","height"=>"1723"),"Kuga"=>array("length"=>"4443","width"=>"1842","height"=>"1677")
    ,"Mondeo"=>array("length"=>"4844","width"=>"1886","height"=>"1500"),"Ranger"=>array("length"=>"5075","width"=>"1805","height"=>"1745")
    ,"S-Max"=>array("length"=>"4768","width"=>"1854","height"=>"1658"),
    "Hummer"=>array("H2"=>array("length"=>"5170","width"=>"2063","height"=>"2012"),"H3"=>array("length"=>"4782","width"=>"1989","height"=>"1872")));

像这样插入 MySQL 表：

CREATE TABLE IF NOT EXISTS `cars_dimensions` (
  `id` int(10) NOT NULL auto_increment,
  `brand` varchar(120) character set utf8 NOT NULL,
  `model` varchar(120) character set utf8 NOT NULL,
  `length` varchar(5) character set utf8 NOT NULL,
  `width` varchar(5) character set utf8 NOT NULL,
  `height` varchar(5) character set utf8 NOT NULL,
  KEY `id` (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;

当我使用foreach 和$cars["Hummer"]["H2"]["length"]; 时，我不知何故无法获得另一个数组维度并同时缓存实际的品牌/型号......不过，我的实际数组在第一个维度中大约有 3000 个项目（品牌）。

【问题讨论】：

到目前为止，每个答案都假定悍马与福特处于同一水平，但在您的示例中并非如此，也许这只是一个错字。如果是他们的代码将起作用，如果不是，到目前为止的 3 个答案都不合适。
是的，抱歉，我只是以错误的方式复制粘贴了代码 :)

标签： php mysql arrays multidimensional-array

【解决方案1】：

您需要两个循环，一个用于品牌，一个用于他们的模型：

foreach ($cars as $brand => $models) {
    foreach ($models as $model => $specs) {
        $query = "INSERT INTO cars_demensions (brand, model, length, weight, height)
                  VALUES ('$brand', '$model', {$specs['length']}, {$specs['width']}, {$specs['height']});";
    }
}

【讨论】：

【解决方案2】：

foreach ( $cars as $brandname => $carinfo  )
{
foreach ( $carinfo  as $modelname => $car )
{
// brand = $brandname
// model = $modelname
// length = $car['length']
// do insert query here
}
}

【讨论】：

【解决方案3】：


$rows = '';
foreach($cars AS $brand) {
  foreach($brand AS $model) {
    if(!empty($rows)) $rows .= ', ';
    $rows = "({$car['width']},...)";
  }
}

$sql = "INSERT INTO cars_dimensions (width,...) VALUES $rows";

【讨论】：

【解决方案4】：

完整的可执行代码和测试。这是执行此操作的更有效和更快的方法。使用这种方式，您可以使用单个插入查询插入多行。

<?php 
$col = [];
foreach ($cars as $brand => $models) {
    foreach ($models as $model => $specs) {
        if (isset($specs['length']) || isset($specs['width']) || isset($specs['height'])) {
            $length = $specs['length'];
            $width = $specs['width'];
            $height = $specs['height'];
        } else {
            foreach ($specs as $k => $v) {
                $length = $v['length'];
                $width = $v['width'];
                $height = $v['height'];
            }
        }
        $col[] = "('" . $brand . "', '" . $model . "', '" . $length . "', '" . $width . "', '" . $height . "')";
    }
}
$query = "INSERT INTO `cars_dimensions`(`brand`, `model`, `length`, `width`, `height`) VALUES" . implode(',', $col) . ";";

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "test";
try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $conn->exec($query);
} catch (PDOException $e) {
    echo $e->getMessage();
}
?>

希望对您有所帮助。谢谢。

【讨论】：