PHP中高效查找对象数组：避免循环覆盖与优化搜索策略

$entries = array(
  (object) [
    "uid" => "1234",
    "item" => "x",
    "text_prefix" => "x",
    "text_suffix" => "x",
    "prize_link" => "x",
    "data_captcher" => true
  ],
  (object) [
    "uid" => "5678",
    "item" => "x",
    "text_prefix" => "x",
    "text_suffix" => "x",
    "prize_link" => "x",
    "data_captcher" => false
    ],
);

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $code = isset($_POST['code']) ? $_POST['code'] : '';
  $value = 'false'; // 初始值，用于在没有匹配时返回

  for ($x = 0; $x < count($entries); $x++) {
    if ($entries[$x]->uid == $code) {
      $value = [
        "uid" => $entries[$x]->uid,
        "item" => $entries[$x]->item,
        "text_prefix" => $entries[$x]->text_prefix,
        "text_suffix" => $entries[$x]->text_suffix,
        "prize_link" => $entries[$x]->prize_link,
        "data_captcher" => $entries[$x]->data_captcher,
      ];
    } else {
      // 这里的逻辑是问题的根源
      // 如果当前元素不匹配，即使之前有匹配，也会被重置为'false'
      $value = 'false'; 
    }
  }

  echo json_encode($value);
}

// ... (前略：$entries 数组定义)

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $code = isset($_POST['code']) ? $_POST['code'] : '';
  $value = 'false'; // 初始值，用于在没有匹配时返回

  for ($x = 0; $x < count($entries); $x++) {
    if ($entries[$x]->uid == $code) {
      $value = [
        "uid" => $entries[$x]->uid,
        "item" => $entries[$x]->item,
        "text_prefix" => $entries[$x]->text_prefix,
        "text_suffix" => $entries[$x]->text_suffix,
        "prize_link" => $entries[$x]->prize_link,
        "data_captcher" => $entries[$x]->data_captcher,
      ];
      break; // <== 找到匹配项后立即停止循环
    }
    // else { // 移除此处的else分支，因为不匹配时$value保持原样或不进行操作
    //   $value = 'false'; 
    // }
  }

  echo json_encode($value);
}

// ... (前略：$entries 数组定义)

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $code = isset($_POST['code']) ? $_POST['code'] : '';
  $value = 'false'; // 初始值

  foreach ($entries as $entry) { // 直接迭代对象
    if ($entry->uid == $code) {
      $value = [
        "uid" => $entry->uid,
        "item" => $entry->item,
        "text_prefix" => $entry->text_prefix,
        "text_suffix" => $entry->text_suffix,
        "prize_link" => $entry->prize_link,
        "data_captcher" => $entry->data_captcher,
      ];
      break; // 找到匹配项后立即停止循环
    }
  }

  echo json_encode($value);
}

// ... (前略：$entries 数组定义)

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $code = isset($_POST['code']) ? $_POST['code'] : '';

  $filteredEntries = array_filter($entries, function($entry) use ($code) {
    return $entry->uid == $code;
  });

  if (!empty($filteredEntries)) {
    // 如果找到多个匹配，通常我们只关心第一个
    $matchedEntry = reset($filteredEntries); 
    $value = [
      "uid" => $matchedEntry->uid,
      "item" => $matchedEntry->item,
      "text_prefix" => $matchedEntry->text_prefix,
      "text_suffix" => $matchedEntry->text_suffix,
      "prize_link" => $matchedEntry->prize_link,
      "data_captcher" => $matchedEntry->data_captcher,
    ];
  } else {
    $value = 'false';
  }

  echo json_encode($value);
}

// ... (前略：$entries 数组定义)

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $code = isset($_POST['code']) ? $_POST['code'] : '';

  // 提取所有对象的uid属性到一个新数组
  $uids = array_column($entries, 'uid');

  // 检查$code是否存在于$uids数组中
  if (in_array($code, $uids)) {
    // 如果需要获取匹配的完整对象，仍然需要遍历原始数组或使用array_filter
    // 这里的in_array只判断是否存在，不返回对象本身
    $value = ['message' => 'UID found', 'uid' => $code]; // 示例，实际可能需要进一步处理
  } else {
    $value = 'false';
  }

  echo json_encode($value);
}

/**
 * 在对象数组中根据指定属性查找第一个匹配的对象。
 *
 * @param array $objects 对象数组。
 * @param string $property 要匹配的属性名。
 * @param mixed $value 要匹配的属性值。
 * @return object|null 找到的第一个匹配对象，如果没有找到则返回null。
 */
function findObjectInArray(array $objects, string $property, $value): ?object
{
    foreach ($objects as $object) {
        if (isset($object->$property) && $object->$property == $value) {
            return $object;
        }
    }
    return null;
}

// ... (前略：$entries 数组定义)

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $code = isset($_POST['code']) ? $_POST['code'] : '';

  $matchedEntry = findObjectInArray($entries, 'uid', $code);

  if ($matchedEntry) {
    $value = [
      "uid" => $matchedEntry->uid,
      "item" => $matchedEntry->item,
      "text_prefix" => $matchedEntry->text_prefix,
      "text_suffix" => $matchedEntry->text_suffix,
      "prize_link" => $matchedEntry->prize_link,
      "data_captcher" => $matchedEntry->data_captcher,
    ];
  } else {
    $value = 'false';
  }

  echo json_encode($value);
}