<?php
// Used a replacement for microtime(1)
function getmicrotime() 
{ 
    list($usec, $sec) = explode(" ", microtime()); 
    return ((float)$usec + (float)$sec); 
} 

// Reads contents of a file 1024 bytes at a time
function phpautotest_readf($filename) 
{
    $fh = fopen("$filename", 'rb');
   	while (!feof($fh)) 
   	{
    	$content .= fgets ($fh, 1024);;
    }
    fclose($fh);
    return $content;
}

// Display an error to the user
function phpautotest_show_error($error)
{
	// Make sure header and menu are always present before displaying the error
	require_once 'includes/header.php';
	require_once 'includes/top_menu.php';

	echo 
	"
	<center>
	<table cellspacing='1' cellpadding='3' bgcolor='white' width = '35%' class = 'box'> 
	<tr bgcolor='#005896'>
	<td align = 'left'><font color='#FFFFFF'><b>error!</b></font></td>
	</tr>
	<tr bgcolor='#dddddd'>
	<td align = 'left'><font color='#000000'>$error</font></td>
	</tr>
	</table>
	</center>
	";
	
	require 'includes/footer.php';
	exit;
}

// Display a message to the user. It differs from phpautotest_show_error() as it does not stop execution of code
function phpautotest_show_message($message)
{
	// Make sure header and menu are always present before displaying the error
	require_once 'includes/header.php';
	require_once 'includes/top_menu.php';
	
	echo 
	"
	<center>
	<table cellspacing='1' cellpadding='3' bgcolor='white' width = '35%' class = 'box'> 
	<tr bgcolor='#005896'>
	<td align = 'left'><font color='#FFFFFF'><b>message!</b></font></td>
	</tr>
	<tr bgcolor='#dddddd'>
	<td align = 'left'><font color='#000000'>$message</font></td>
	</tr>
	</table>
	</center>
	";
}

// Stops execution if user is not logged in. Preferably called at the top of a page.
function restrict_access()
{
	require('phpautotest_config.php');
	
	if($_COOKIE['logged_in'] != 1)//if(!isset($_SESSION['logged_in']))
	{
		phpautotest_show_error($phpautotest_error['restricted_area']);
	}
}

// Escapes ^.[]$()|*+?{\ from $string so it can be used in pattern matching
function escape_for_regex($string)
{
	$escape_this = "^.[]$()|*+?{";

	// Replacement of \ with \\ causes problems in the following loop as each replacement results in a \
	$string = str_replace('\\', '\\\\', $string);

	$escape_this_num = strlen($escape_this);
	for($i = 0; $i < $escape_this_num; $i++)
	{
		$search[$i] = $escape_this[$i];
		$replace[$i] = "\\".$escape_this[$i];
	}

	$string = str_replace($search, $replace, $string);
	
	return $string;
}

// Obtains last value of primary key (usually `id`)
function phpautotest_last_value($table, $key = 'id')
{
	$QUERY = <<<END

		SELECT
			$key
		FROM
			`$table`
		ORDER  BY $key DESC LIMIT 1
END;

	$result = phpautotest_send_query($QUERY);
	$row = mysql_fetch_assoc($result);
	
	if($row[$key])
		{
			return $row[$key];
		}
	else
		{
			return 0;
		}
}

// Extracts path from an absolute URL, this path may be used to calculate absolute URL from a relative URL
function phpautotest_return_path($url)
{
	// Split the location and remove the last element (filename) from the resulting array. Implode the array to obtain the path sans filename
	$sa = explode('/', $url);
	array_pop($sa);
	$path = implode('/', $sa);
	
	return $path;
}

function phpautotest_writef($filename, $data) 
{
	if(!($file = fopen($filename, 'w')) || !fwrite($file, "$data"))
	{
		return "fail";
	}
}

// Connect to the database and return a MySQL link identifier on success, or print and error and die on failure
function phpautotest_db_connect()
{
	require('phpautotest_config.php');

	$db = mysql_connect($phpautotest_db_location, $phpautotest_db_username, $phpautotest_db_password) or die('Error connecting to the database');
	
	mysql_select_db($phpautotest_db_name);

	return $db;
}

// Create a database connection and sends the query which is passed as an argument. Returns either a resource identifier, TRUE or FALSE
function phpautotest_send_query($query)
{
	$db = phpautotest_db_connect();

	$result = mysql_query($query, $db) or die(mysql_error());

	return $result;
}
?>