PHP implements method of querying different elements in two arrays_php tips

The example in this article describes the method of querying different elements in two arrays in PHP. 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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