core.php
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core.php
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	<?php

	namespace Keruald;

	/**
	* Keruald, core libraries for Pluton and Xen engines.
	*
	* Global functions
	*/

	///
	/// Error and debug
	///

	/**
	* Prints human-readable information about a variable, wrapped in a <pre> block
	*
	* @param mixed $variable the variable to dump
	*/
	function dprint_r ($variable) {
	echo '<pre>';
	print_r($variable);
	echo '</pre>';
	}

	/**
	* Prints human-readable information about a variable, wrapped in a <pre> block
	* then dies
	*
	* @param mixed $variable the variable to dump
	*/
	function dieprint_r ($variable) {
	dprint_r($variable);
	die;
	};

	///
	/// Client information
	///

	/**
	* Returns the full header or the IP part of it
	*
	* @param string $value The header value
	* @return string the IP part
	*/
	function extract_client_ip_from_header ($value) {
	if (strpos($value, ',') !== false) {
	//Header contains 'clientIP, proxyIP, anotherProxyIP'
	//The first value is so the one to return.
	//See draft-ietf-appsawg-http-forwarded-10.
	$ips = explode(',', $value, 2);
	return trim($ips[0]);
	}

	return $value;
	}

	/**
	* Gets remote IP address.
	*
	* This is intended as a drop-in replacement for $_SERVER['REMOTE_ADDR'],
	* which takes in consideration proxy values.
	*/
	function get_remote_addr () {
	$candidates = [
	//Standard header provided by draft-ietf-appsawg-http-forwarded-10
	'HTTP_X_FORWARDED_FOR',

	//Legacy headers
	'HTTP_CLIENT_IP',
	'HTTP_FORWARDED',
	'HTTP_FORWARDED_FOR',
	'HTTP_X_CLUSTER_CLIENT_IP',
	'HTTP_X_FORWARDED',

	//Default header if no proxy information could be detected
	'REMOTE_ADDR',
	];

	foreach ($candidates as $candidate) {
	if (array_key_exists($candidate, $_SERVER)) {
	return extract_client_ip_from_header($_SERVER[$candidate]);
	}
	}

	return '';
	}

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