PHP 注意:未定义的属性:stdClass::$results 在 Analyst.php 第 23 行

Question

我试图获取 json 中的价格，然后将其上传到 mysql 表，但我收到此错误:

PHP 注意:未定义的属性:stdClass::$results 在 Analyst.php 第 23 行

第 23 行是:

$items_count = count($items->results);

s

$db = new db(DB_USER, DB_PASS, DB_HOST, DB_NAME, array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'));
if($db) echo "   => Connected!\n";
else exit("   => ERROR! Aborting!\n");

echo "=> Getting new pricelist from analyst\n";
if( $curl = curl_init() ) {
        curl_setopt($curl, CURLOPT_URL, "http://analyst.x-se.ru/");
        curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);
        $urljson = curl_exec($curl);
        curl_close($curl);
}
if($urljson) echo "   => Completed!\n";
else exit("   => Failed! Aborting!\n");

$items = (object)json_decode($urljson);
$items_count = count($items->results);
$percent = 0;
echo "   => Downloaded $items_count items\n";
if($items_count < 2000) exit("=> Incorrect array of items, aborting!\n");

Answer 1

$items 对象来自 $urljson 变量。如果$urljson不存在，很明显它会显示关于该变量的NOTICE。因此，根据我的说法，当您检查 if($urljson){ 时，您可以仅将这 2-3 行代码放置在此范围内。

$urljson 在其他条件下未初始化。

如果存在 $urljson，您的代码将进一步进行。否则，else 将被执行。

更新代码

$db = new db(DB_USER, DB_PASS, DB_HOST, DB_NAME, array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'));
if($db){
  echo "   => Connected!\n";
} else {
  exit("   => ERROR! Aborting!\n");
}

echo "=> Getting new pricelist from analyst\n";
if( $curl = curl_init() ) {
  curl_setopt($curl, CURLOPT_URL, "http://analyst.x-se.ru/");
  curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);
  $urljson = curl_exec($curl);
  curl_close($curl);
}

if($urljson){
  echo "   => Completed!\n";

  $items = (object)json_decode($urljson);
  $items_count = count($items->results);
  $percent = 0;
  echo "   => Downloaded $items_count items\n";
  if($items_count < 2000){
    exit("=> Incorrect array of items, aborting!\n");
  }

} else {
  exit("   => Failed! Aborting!\n");
}