遍历数组，将值与对象值进行比较，并根据这些值定义一个新数组答案

【问题标题】：Loop through array, compare values with object values and define a new array, based on those values遍历数组，将值与对象值进行比较，并根据这些值定义一个新数组
【发布时间】：2021-02-23 11:19:29
【问题描述】：

我将图像保存在数据库和服务器上。我必须从数据库中获取图像并将它们与服务器上的图像进行比较。如果匹配，则显示图像（使用匹配的图像名称创建新数组并在浏览器中获取它们）

例子：

$db_image_array

 Array
 (
 [0] => Array
    (
        [id] => 14
        [eid] => 27
        [stype_id] => 1  // folder1
        [ihash] => oOYvcSEGeUjDpL2a.jpg
    )

[1] => Array
    (
        [id] => 19
        [eid] => 27
        [stype_id] => 3  // folder3 
        [ihash] => XYmpP49Z5ye2OTL8.jpg
    )

[2] => Array
    (
        [id] => 20
        [eid] => 27
        [stype_id] => 1 // folder1
        [ihash] => uqF6whY6F6zNmdC7.jpg
    )

[3] => Array
    (
        [id] => 21
        [eid] => 27
        [stype_id] => 1 // folder1
        [ihash] => KXuYIidPpHrkZc96.jpg
    )

)

$serverFolderArray

 Array
 (
   [folder1] => Array
    (
        [0] => SplFileInfo Object
            (
                [pathName:SplFileInfo:private] => /var/www/vhosts/img/1629973f75566aed/folder1/uqF6whY6F6zNmdC7.jpg
                [fileName:SplFileInfo:private] => uqF6whY6F6zNmdC7.jpg
            )
        [1] => SplFileInfo Object
            (
                [pathName:SplFileInfo:private] => /var/www/vhosts/img/1629973f75566aed/folder1/oOYvcSEGeUjDpL2a.jpg
                [fileName:SplFileInfo:private] => oOYvcSEGeUjDpL2a.jpg
            )
        [2] => SplFileInfo Object
            (
                [pathName:SplFileInfo:private] => /var/www/vhosts/img/1629973f75566aed/folder1/KXuYIidPpHrkZc96.jpg
                [fileName:SplFileInfo:private] => KXuYIidPpHrkZc96.jpg
            )
    )

[folder2] => Array
    (
    )
[folder3] => Array
    (
        [0] => SplFileInfo Object
            (
                [pathName:SplFileInfo:private] => /var/www/vhosts/img/1629973f75566aed/folder3/XYmpP49Z5ye2OTL8.jpg
                [fileName:SplFileInfo:private] => XYmpP49Z5ye2OTL8.jpg
            )
    )

[folder4] => Array
    (
    )
 )

我的第一次尝试是这段代码：

 if ($db_image_array) {
     foreach ($serverFolderArray as $arrayName => $serverImageArray) {
       if ( ! empty($serverImageArray)) {
           for ($y = 0; $y < count($db_image_array); $y++) {
               for ($x = 0; $x < count($serverImageArray); $x++) {
                   if ($serverImageArray[$x]->getFilename() === $db_image_array[$y]['ihash']) {
                       $arr[$x] = $db_image_array[$y]['ihash'];
                       $chunked_array[$arrayName] = array_chunk($arr, 4);
                   }
               }
           }
       }
   }

}

还有第二次尝试 foreach 循环：

    if ( ! empty($serverImageArray)) {
        for ($x = 0; $x < count($serverImageArray); $x++) {
            foreach ($db_image_array as $key => $val) {
                if ($serverImageArray[$x]->getFilename() === $val['ihash']) {
                    $arr[$x] = $val['ihash'];
                    $chunked_array[$arrayName] = array_chunk($arr, 4);
                    break;
                }
            }
        }
    }

两种方式都给我错误的图像排序chunked_array：

Array
(
  [folder1] => Array
    (
        [0] => Array
            (
                [0] => oOYvcSEGeUjDpL2a.jpg
                [1] => uqF6whY6F6zNmdC7.jpg
                [2] => KXuYIidPpHrkZc96.jpg
            )
    )
  [folder3] => Array
    (
        [0] => Array
            (
                [0] => oOYvcSEGeUjDpL2a.jpg // this one has not to be here
                [1] => XYmpP49Z5ye2OTL8.jpg 
                [2] => KXuYIidPpHrkZc96.jpg // and this one also doesn't have to be in this array
            )
      )
)

您如何看待这种情况？逻辑错误在哪里？

【问题讨论】：

标签： php arrays sorting object compare

【解决方案1】：

所以，在这个 bug 上苦苦挣扎了好几个小时，但是在创建这个主题 30 分钟后发现了一个逻辑 bug，每次新数组名称出现时我都必须清除 $arr：

$arr=[];  //  <----  !!!
if ( ! empty($serverImageArray)) {
    for ($x = 0; $x < count($serverImageArray); $x++) {
        foreach ($db_image_array as $key => $val) {
            if ($serverImageArray[$x]->getFilename() === $val['ihash']) {
                $arr[$x] = $val['ihash'];
                $chunked_array[$arrayName] = array_chunk($arr, 4);           
            }
        }
    }
}

【讨论】：