PHP implements method of querying different elements in two arrays

The example in this article describes how PHP implements querying different elements in two arrays. Share it with everyone for your reference, the details are as follows:

<&#63;php
  $a = array(
  "max_allow_dialogs",
  "livechat_server_ip",
  "livechat_service_time",
  "abort_zh_cn",
  "abort_zh_tw",
  "abort_en_usa",
  "welcome_zh_cn",
  "welcome_zh_tw",
  "welcome_en_usa",
  "timeout_zh_cn",
  "timeout_zh_tw",
  "timeout_en_usa",
  "absence_zh_cn",
  "absence_zh_tw",
  "absence_en_usa"
  );
  $b = array(
  "max_allow_dialogs",
  "livechat_server_ip",
  "livechat_service_time",
  "abort_zh_cn",
  "abort_zh_tw",
  "abort_en_usa",
  "welcome_zh_cn",
  "welcome_zh_tw",
  "welcome_en_usa",
  "timeout_zh_cn",
  "timeout_zh_tw",
  "timeout_en_usa",
  );
  $c = array_merge(array_diff($a,$b),array_diff($b,$a));
  print_r($c);
&#63;>

Result:

Array
(
  [0] => absence_zh_cn
  [1] => absence_zh_tw
  [2] => absence_en_usa
)

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