handlers-to-autoreload

<?php

#===========================================================
# [author]
# Dodzi Y. Dzakuma
# [summary]
# This function checks if a superglobal parameter is set in
# specified superglobal. If no superglobal is specified this
# function will check the $_REQUEST superglobal by default.
# [parameters]
# 1) parameter name to check
# 2) value to return if not set (optional)
# 3) name of superglobal array to search (optional)
# [return]
# 1) the value of spefcified parameter
# 2) the default value if specified parameter doesn't exist
# 3) null if no default value spcified
#===========================================================
function checkRequest(
	$variableName, 
	$defaultValue = "", 
	$functionName = ""
) {
	$superglobalArray = null;
	if (stripos($functionName, "get") !== false) {
		$superglobalArray = &$_GET;
	} else if (stripos($functionName, "files") !== false) {
		$superglobalArray = &$_FILES;
	} else if (stripos($functionName, "post") !== false) {
		$superglobalArray = &$_POST;
	} else if (stripos($functionName, "cookie") !== false) {
		$superglobalArray = &$_COOKIE;
	} else if (stripos($functionName, "session") !== false) {
		$superglobalArray = &$_SESSION;
	} else{
		$superglobalArray = &$_REQUEST;
	}

	#
	if (!isset($superglobalArray[$variableName])) {
		return ($defaultValue ? $defaultValue : null);
	}
	return $superglobalArray[$variableName];
}

function checkCookie($variableName, $defaultValue = "") {
	return checkRequest($variableName, $defaultValue, __FUNCTION__);
}

function checkPost($variableName, $defaultValue = "") {
	return checkRequest($variableName, $defaultValue, __FUNCTION__);
}

function checkFiles($variableName, $defaultValue = "") {
	return checkRequest($variableName, $defaultValue, __FUNCTION__);
}

function checkGet($variableName, $defaultValue = "") {
	return checkRequest($variableName, $defaultValue, __FUNCTION__);
}

$timeout = checkPost("timeout"); 
$requestType = checkPost("requestType");
$monitorList = checkPost("monitorList");
$previousUpdateStatusList = checkPost("previousUpdateStatusList");
$currentUpdateStatusList = array();

$maximumRetries = checkPost("timeout", 300);

for ($retryCount = 0; $retryCount < $maximumRetries; $retryCount++)  {
	// #things
	$currentUpdateStatusList = array();
	$updateFlag = false;
	$fileCount = count($monitorList);
	for ($file = 0; $file < $fileCount; $file++) {
		$filePath = $monitorList[$file];
		$fileStatus = stat($filePath);
		$currentUpdateStatusList[] = $fileStatus["mtime"];

		if (
			isset($previousUpdateStatusList[$file]) &&
			$currentUpdateStatusList[$file] != $previousUpdateStatusList[$file]
		) {
			$updateFlag = !$updateFlag;
			$currentUpdateStatusList[$file] .= ":updated";
		}
	}
	 
	if (!$updateFlag) {
		sleep(1);
	} else {
		$response["previousUpdateStatusList"] = implode(",", $currentUpdateStatusList);
		header("Content-Type: application/json");
		header("Expires: Tue, 01 Jan 2000 00:00:00 GMT");
		header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
		header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
		header("Cache-Control: post-check=0, pre-check=0", false);
		header("Pragma: no-cache");
		print(json_encode($response));
		break;
	}
}