由于未定义索引，无法从数组1分配值到数组2

Question

$new_stock_array具有以下价值：

$new_stock_array = Array
(
    "VRX1600/380" => 0,
    "NEFOM" => 1,
    "PZ1000-840" => 4,
    "CU1000TNG" => 1,
    "SST-91" => 0,
    "BEER3" => 12,
    "L09125N" => 1,
    "B15GFA" => 0,
    "IBM20" => 8,
    "FGDG1500LS-3" => 0,
    "BD550S" => 2,
    "GNX1400TNG" => 1,
    "SH3000-800" => 6,
    "SLX3100TN" => 1,
    "FGOR1000LC" => 7,
    "ITR50" => 2,
    "SH2000-800" => 1,
    "FGOR1200LC" => 1,
    "TRAYS66LGLASS" => 1,
    "B215G" => 1,
    "SD520Q" => 7,
    "ST1200-NG" => 1,
    "BD650S" => 6,
    "GFC400-LPG" => 1,
    "CH300-LPG" => 1,
    "B318G" => 5,
    "CST400-LPG" => 1,
    "TC12" => 2,
    "STAND6LTRAYS" => 2,
    "SLX2100TN" => 0,
    "STGR300" => 4,
    "SH2000-700" => 5,
    "SLX4100TN" => 0,
    "BTS120L" => 16,
    "HX-1S" => 1,
    "PAX2100TNG" => 2,
    "BTS160L" => 19,
    "GNX1400TN" => 1,
    "VRX1200/380" => 2,
    "GFC400-NG" => 1,
    "GN400TNV" => 2,
    "CST400-NG" => 1,
    "AGGF-3-NG" => 14,
    "CGR400-NG" => 1,
    "GNX2100TNG" => 2,
    "GNX2100TN" => 2,
    "BC05" => 2,
    "ST1200-LPG" => 2,
    "GR300-LPG" => 2,
    "AGGF-3-LPG" => 0,
    "CGR400-LPG" => 2,
    "TRAYS6GLASS" => 3,
    "BEER3SS" => 3,
    "GNX650TN" => 3,
    "GNX4100TNG" => 3,
    "PAX3100TNG" => 2,
    "SH3000-700" => 3,
    "STAND6TRAYS" => 3,
    "TRAYS6LGLASS" => 3,
    "B1400TNV" => 2,
    "PZ2000-840" => 3,
    "4OVST-LPG" => 3,
    "AGGF-5-LPG" => 3,
    "ST600-NG" => 3,
    "CH600-NG" => 3,
    "WS540BTG" => 3,
    "BASE300" => 3,
    "SP18G" => 4,
    "CH900-NG" => 4,
    "WS1900BTG" => 4,
    "BASE1200" => 4,
    "BD700S" => 4,
    "GNX2100BT" => 5,
    "IBM30" => 5,
    "PZ3000-840" => 6,
    "CH600-LPG" => 6,
    "6OVST-LPG" => 5,
    "GNX3100TN" => 6,
    "GNX3100BT" => 6,
    "GNX3100TNG" => 5,
    "GNX4100TN" => 8,
    "DSA420TGO" => 9,
    "AGGF-4-LPG" => 7,
    "EASY50" => 9,
    "AGGF-4-NG" => 9
);

下面是$all_rows的一个极小的摘录：

$all_rows = array(
0 => Array
    (
        "web-scraper-order" => "web-scraper-order",
        "web-scraper-start-url" => "web-scraper-start-url",
        "top_category_links" => "top_category_links",
        "top_category_links-href" => "top_category_links-href",
        "product_links" => "product_links",
        "product_links-href" => "product_links-href",
        "title" => "title",
        "mpn" => "mpn",
        "rrp_price_inc" => "rrp_price_inc",
        "stock" => "stock",
        "desc" => "desc",
        "primary_img_large" => "primary_img_large",
        "breadcrumb_categories" => "breadcrumb_categories",
        "stock_commentary" => "stock_commentary",
        "next_page" => "next_page",
        "next_page-href" => "next_page-href",
        "rrp_price_ex" => "rrp_price_ex",
        "full_img" => "full_img",
        "grouped_src_3_loaded_only" => "grouped_src_3_loaded_only",
        "grouped_src_3_loaded_only-src" => "grouped_src_3_loaded_only-src",
        "ETA_label" => "ETA_label",
        "pagination_gallery" => "pagination_gallery",
        "div_href_img" => "div_href_img",
        "manual" => "manual",
        "collected_images" => "collected_images"
    ),

1 => Array
    (
        "web-scraper-order" => "1661506781-1480",
        "web-scraper-start-url" => "https://www.agequipment.com.au/",
        "top_category_links" => "",
        "top_category_links-href" => "https://www.agequipment.com.au/food-processing/",
        "product_links" => "12 Inch (300mm) Meat Slicer",
        "product_links-href" => "https://www.agequipment.com.au/12inch-300mm-meat-slicer/",
        "title" => "12 Inch (300mm) Meat Slicer",
        "mpn" => "VRX1600/380",
        "rrp_price_inc" => "999.00",
        "stock" => "PRE ORDER",
        "desc" => "",
        "primary_img_large" => "",
        "breadcrumb_categories" => "",
        "stock_commentary" => "Pre-Order now for next shipment 9/9/2022",
        "next_page" => "",
        "next_page-href" => "",
        "rrp_price_ex" => "$908.18",
        "full_img" => "https://www.agequipment.com.au/pub/media/catalog/product/cache/10fe8d9df2d769f1f80c003a45c2fe8b/1/0/10x.jpg",
        "grouped_src_3_loaded_only" => "",
        "grouped_src_3_loaded_only-src" => "",
        "ETA_label" => "ETA 9/9/2022",
        "pagination_gallery" => "",
        "div_href_img" => "",
        "manual" => "",
        "collected_images" => ""
    ),

2 => Array
    (
        "web-scraper-order" => "1661576256-1882",
        "web-scraper-start-url" => "https://www.agequipment.com.au/",
        "top_category_links" => "",
        "top_category_links-href" => "https://www.agequipment.com.au/gas/",
        "product_links" => "Commercial Gas Fryer - 3 Burner (LPG)",
        "product_links-href" => "https://www.agequipment.com.au/commercial-gas-fryer-3-burner-lpg./",
        "title" => "Commercial Gas Fryer - 3 Burner (LPG)",
        "mpn" => "AGGF-3-LPG",
        "rrp_price_inc" => "1,599.00",
        "stock" => "Out Of Stock",
        "desc" => "",
        "primary_img_large" => "",
        "breadcrumb_categories" => "",
        "stock_commentary" => "Pre-Order now for next shipment, arriving in several weeks",
        "next_page" => "",
        "next_page-href" => "",
        "rrp_price_ex" => "$1,453.64",
        "full_img" => "https://www.agequipment.com.au/pub/media/catalog/product/cache/10fe8d9df2d769f1f80c003a45c2fe8b/a/g/aggf-3-6_1.jpg",
        "grouped_src_3_loaded_only" => "",
        "grouped_src_3_loaded_only-src" => "",
        "ETA_label" => "",
        "pagination_gallery" => "",
        "div_href_img" => "",
        "manual" => "",
        "collected_images" => ""
    )
);

下面是我试图运行的循环，以便从第一个数组中获取$val1值，并将它们分配给第二个数组中的$row['mpn']：

foreach ($new_stock_array as $key1 => $val1){
foreach ($all_rows as &$row) {

  $row['stock_count'] = '';

   if ($key1 == $row['mpn'] ){
     $row['stock_count'] = $val1;
   }
}
}

结果是$row['stock_count'] = '';被添加到$all_rows数组中，但是当存在这样的值时，来自$new_stock_array的股票值$val1无法分配给$row['stock_count']。

不管是否相关-不清楚-但我也收到了通知：

注意:未定义的索引: /opt/lampp/htdocs/agequipment/reconsolidate_img_arrays.php中的mpn行322

Answer 1

我得到了

注意:第322行/opt/lampp/htdocs/agequipment/reconsolidate_img_arrays.php中未定义的索引: mpn

因为在实际数据中(相对于这里给出的最小数据摘录)，有些数据没有被设置，因为数据有空白的数据单元格。

Answer 2

引申是众所周知的引起问题，最好避免。

嵌套循环在外部循环的每一个迭代中的每一行上设置$row['stock_count'] = '';。这只会导致$new_stock_array中最后一个mpn的行具有不同的值。您只需要循环一次$all_rows，并使用该行的mpn查找值$new_stock_array[$row['mpn']]。检查以确保数组键在赋值之前存在。

foreach ($all_rows as $r_key => $row) {
  $all_rows[$r_key]['stock_count'] = (array_key_exists('mpn', $row) && array_key_exists($row['mpn'], $new_stock_array)) ?
    $new_stock_array[$row['mpn']] : '';
}

在行动中看到它：https://onlinephp.io/c/20ebc