Method for determining whether PHP custom functions are submitted by Get, Post and Ajax

This article describes the method of determining whether PHP custom functions are submitted by Get, Post and Ajax. Share it for your reference, as follows:

/**
  * Is it submitted by AJAx
  * @return bool
  */
function isAjax(){
  if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) &amp;&amp; strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){
    return true;
  }else{
    return false;
  }
}
/**
  * Is it submitted by GET
  */
function isGet(){
  return $_SERVER['REQUEST_METHOD'] == 'GET' ? true : false;
}
/**
  * Is it a POST submission
  * @return int
  */
function isPost() {
  return ($_SERVER['REQUEST_METHOD'] == 'POST' &amp;&amp; checkurlHash($GLOBALS['verify']) &amp;&amp; (empty($_SERVER['HTTP_REFERER']) || preg_replace("~https?:\/\/([^\:\/]+).*~i", "\\1", $_SERVER['HTTP_REFERER']) == preg_replace("~([^\:]+).*~", "\\1", $_SERVER['HTTP_HOST']))) ? 1 : 0;
}

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