w3l / holt45

holt45.php

<?

It is not recommend to use PHP's short opening tag <?, better use <?php, or <?= in case of outputting.

/**
 * Check $_GET
 *
 * @example if(chk_get("s") == "a") instead of if(isset($_GET["s"]) && $_GET["s"] == "a")
 */
function chk_get($key) {
    if (!isset($_GET[$key])) {
        return false;
    }
    return $_GET[$key];
}

/**
 * Check $_POST
 *
 * @example if(chk_post("s") == "a") instead of if(isset($_POST["s"]) && $_POST["s"] == "a")
 */
function chk_post($key) {
    if (!isset($_POST[$key])) {
        return false;
    }
    return $_POST[$key];
}

/**
 * Check multiple $_GET-keys
 *
 * @example if(chk_get_all(array("a","b"))) instead of if(!empty($_GET["a"]) && !empty($_GET["b"]))
 */
function chk_get_all($keys) {
	$s = true;

	foreach($keys AS $key) {
	
		if (empty($_GET[$key])) {
			$s = false;
		}
	}
	return $s;
}

/**
 * Check multiple $_POST-keys
 *
 * @example if(chk_post_all(array("a","b"))) instead of if(!empty($_POST["a"]) && !empty($_POST["b"]))
 */
function chk_post_all($keys) {
	$s = true;

	foreach($keys AS $key) {
	
		if (empty($_POST[$key])) {
			$s = false;
		}
	}
	return $s;
}

/**
 * Convert timestamp to HTTP-date (RFC2616)
 *
 * For use in "Last-Modified" headers.
 */
function timestamp_to_http_date($timestamp) {
	if($timestamp == NULL) { return NULL; }
	return gmdate("D, d M Y H:i:s T", strtotime($timestamp));
}

/**
 * Get client ip-address
 *
 * @return string User ip-address
 */
function get_client_ip_address() {

	if (getenv('HTTP_CLIENT_IP'))
		return getenv('HTTP_CLIENT_IP');
	else if(getenv('HTTP_X_FORWARDED_FOR'))
		return getenv('HTTP_X_FORWARDED_FOR');
	else if(getenv('HTTP_X_FORWARDED'))
		return getenv('HTTP_X_FORWARDED');
	else if(getenv('HTTP_FORWARDED_FOR'))
		return getenv('HTTP_FORWARDED_FOR');
	else if(getenv('HTTP_FORWARDED'))
		return getenv('HTTP_FORWARDED');
	else if(getenv('REMOTE_ADDR'))
		return getenv('REMOTE_ADDR');
	else
		return '127.0.0.1'; // Unknown IP
}

/**
 * parse url, try to correct errors and return valid url + display-url.
 *
 * @example http:/wwww.example.com/lorum.html => http://www.example.com/lorum.html
 * @example gopher:/ww.example.com => gopher://www.example.com
 * @example http:/www3.example.com/?q=asd&f=#asd =>http://www3.example.com/?q=asd&f=#asd
 * @example asd://.example.com/folder/folder/ =>http://example.com/folder/folder/
 * @example .example.com/ => http://example.com/
 * @example example.com =>http://example.com
 * @example subdomain.example.com => http://subdomain.example.com
 *
 * @param string $url Any somewhat valid url.
 * @return string[] "url" contains an auto-corrected url. "url_display" host.tld or subdomain.host.tld
 */
function url_parser($url) {
	
	// multiple /// messes up parse_url, replace 3 or more with 2
	$url = preg_replace('/(\/{2,})/','//',$url);
	
	$parse_url = parse_url($url);
	
	if(empty($parse_url["scheme"])) {
		$parse_url["scheme"] = "http";
	}
	if(empty($parse_url["host"]) && !empty($parse_url["path"])) {
		// Strip slash from the beginning of path
		$parse_url["host"] = ltrim($parse_url["path"], '\/');
		$parse_url["path"] = "";
	}

	$url_array = array("url" => "", "url_display" => "");
	
	// Check if scheme is correct
	if(!in_array($parse_url["scheme"], array("http", "https", "gopher"))) {
		$url_array["url"] .= 'http'.'://';
	} else {
		$url_array["url"] .= $parse_url["scheme"].'://';
	}
	
	// Check if the right amount of "www" is set.
	$explode_host = explode(".", $parse_url["host"]);
	
	// Remove empty entries
	$explode_host = array_filter($explode_host);
	// And reassign indexes
	$explode_host = array_values($explode_host);
	
	// Contains subdomain
	if(count($explode_host) > 2) {
		// Check if subdomain only contains the letter w(then not any other subdomain).
		if(substr_count($explode_host[0], 'w') == strlen($explode_host[0])) {
			// Replace with "www" to avoid "ww" or "wwww", etc.
			$explode_host[0] = "www";
			
		}
	}

	$url_array["url"] .= implode(".",$explode_host);
	$url_array["url_display"] = trim(implode(".",$explode_host), '\/'); // Removes trailing slash
	
	if(!empty($parse_url["port"])) {
		$url_array["url"] .= ":".$parse_url["port"];
	}
	if(!empty($parse_url["path"])) {
		$url_array["url"] .= $parse_url["path"];
	}
	if(!empty($parse_url["query"])) {
		$url_array["url"] .= '?'.$parse_url["query"];
	}
	if(!empty($parse_url["fragment"])) {
		$url_array["url"] .= '#'.$parse_url["fragment"];
	}

	
	return $url_array;
}