在foreach中对数组进行排序

Question

我正在尝试在foreach中对数组进行排序。 以下是我的代码：

<?php $_images = Mage::getModel('catalog/product')->load($_product->getId())->getMediaGalleryImages(); ?>
<?php $i = 0; foreach ($_images as $_image){ $i++; ?>
<img src="<?php echo $this->helper('catalog/image')->init($_product, 'thumbnail', $_image->getFile())->resize(300,300); ?>" style="width:50px;height:50px;">
<?php } ?>

我需要以正确的顺序打印图像。它应按以下值排序：

$_image[position_default]

我尝试过使用Ksort：

<?php $_images = Mage::getModel('catalog/product')->load($_product->getId())->getMediaGalleryImages(); ?>
<?php $i = 0; foreach ($_images as $_image){ $i++; ?>
<img src="<?php echo $this->helper('catalog/image')->init($_product, 'thumbnail', $_image->getFile())->resize(300,300); ?>" style="width:50px;height:50px;">
<?php ksort($_image['position']);  ?>
<?php } ?>

但它根本不对它们进行排序。也许我没有正确使用它？ 有什么建议？ ：）

$ _image的一些输出：

[224] => Varien_Object Object
                (
                    [_data:protected] => Array
                        (
                            [value_id] => 224
                            [file] => /s/a/salty_fred_kn_kket.jpg
                            [label] => 
                            [position] => 2
                            [disabled] => 0
                            [label_default] => 
                            [position_default] => 2
                            [disabled_default] => 0
                            [url] => http://webshop.simplychocolate.dk/media/catalog/product/s/a/salty_fred_kn_kket.jpg
                            [id] => 224
                            [path] => /home/www/webshop.simplychocolate.dk/media/catalog/product/s/a/salty_fred_kn_kket.jpg
                        )

                    [_hasDataChanges:protected] => 
                    [_origData:protected] => 
                    [_idFieldName:protected] => 
                    [_isDeleted:protected] => 
                    [_oldFieldsMap:protected] => Array
                        (
                        )

                    [_syncFieldsMap:protected] => Array
                        (
                        )

                )

            [247] => Varien_Object Object
                (
                    [_data:protected] => Array
                        (
                            [value_id] => 247
                            [file] => /i/m/image_150.jpg
                            [label] => 
                            [position] => 3
                            [disabled] => 0
                            [label_default] => 
                            [position_default] => 1
                            [disabled_default] => 0
                            [url] => http://webshop.simplychocolate.dk/media/catalog/product/i/m/image_150.jpg
                            [id] => 247
                            [path] => /home/www/webshop.simplychocolate.dk/media/catalog/product/i/m/image_150.jpg
                        )

                    [_hasDataChanges:protected] => 
                    [_origData:protected] => 
                    [_idFieldName:protected] => 
                    [_isDeleted:protected] => 
                    [_oldFieldsMap:protected] => Array
                        (
                        )

                    [_syncFieldsMap:protected] => Array
                        (
                        )

                )

            [258] => Varien_Object Object
                (
                    [_data:protected] => Array
                        (
                            [value_id] => 258
                            [file] => /a/v/avatar.png
                            [label] => 
                            [position] => 3
                            [disabled] => 0
                            [label_default] => 
                            [position_default] => 3
                            [disabled_default] => 0
                            [url] => http://webshop.simplychocolate.dk/media/catalog/product/a/v/avatar.png
                            [id] => 258
                            [path] => /home/www/webshop.simplychocolate.dk/media/catalog/product/a/v/avatar.png
                        )

                    [_hasDataChanges:protected] => 
                    [_origData:protected] => 
                    [_idFieldName:protected] => 
                    [_isDeleted:protected] => 
                    [_oldFieldsMap:protected] => Array
                        (
                        )

                    [_syncFieldsMap:protected] => Array
                        (
                        )

                )

Answer 1

您需要使用自定义排序功能，因为您需要与每个图像的某个“属性”的值进行比较。 （见http://www.php.net/manual/en/function.usort.php） 所以在循环之前，放：

function cmp($a, $b)
{
    return strcasecmp($a['_data']['position_default'], $b['_data']['position_default']);
}

usort($_images, "cmp");

编辑：我从uksort改为usort，在那里犯了错误。

Edit2：鉴于您添加的$ _images的输出，position-default属性更深一层，所以我添加了['_data']。

Answer 2

乍一看，看起来ksort应该在foreach循环之前发生。

<?php ksort($_images);  ?>
<?php $i = 0; foreach ($_images as $_image){ $i++; ?>
<img src="<?php echo $this->helper('catalog/image')->init($_product, 'thumbnail', $_image->getFile())->resize(300,300); ?>" style="width:50px;height:50px;">
<?php } ?>

试一试。让我知道它是怎么回事！