Warning: mysql_real_escape_string() expects parameter 1 to be string, array given in

<?php // kleur
print mysql_real_escape_string($_SESSION['user']);
?>

<?php // kleur
print mysql_real_escape_string($_SESSION['user']);
?>

<?php // kleur
$excaped =  mysql_real_escape_string($_SESSION['user']);
$query = mysql_query("SELECT pass FROM users WHERE user = '".$escaped."'");
?>

<?php // kleur
$excaped =  mysql_real_escape_string($_SESSION['user']);
$query = mysql_query("SELECT pass FROM users WHERE user = '".$escaped."'");
?>

<?php
if (!empty($_SESSION["jesessie"]))
{
// je query
}
else
{
print "Je bent niet ingelogd";
}
?>

<?php
if (!empty($_SESSION["jesessie"]))
{
// je query
}
else
{
print "Je bent niet ingelogd";
}
?>

function check_login()
{
	if(empty($_SESSION['user']) || empty($_SESSION['ip']))
	{
		echo 'U bent niet ingelogd. ';
		echo "<a href='/inloggen.php'>Klik hier</a> om in te loggen";
		die();
	}

	if($_SESSION['ip'] != $_SERVER['REMOTE_ADDR'])
	{
		echo 'U bent niet ingelogd. ';
		echo "<a href='/inloggen.php'>Klik hier</a> om in te loggen";
		die();
	}

	$query = mysql_query("SELECT 1 FROM users WHERE user = '".mysql_real_escape_string($_SESSION['user'])."'");
	
	if(mysql_num_rows($query) == 0)
	{
		echo 'U bent niet ingelogd. ';
		echo "<a href='/inloggen.php'>Klik hier</a> om in te loggen";
		die();
	}
}

function check_login()
{
	if(empty($_SESSION['user']) || empty($_SESSION['ip']))
	{
		echo 'U bent niet ingelogd. ';
		echo "<a href='/inloggen.php'>Klik hier</a> om in te loggen";
		die();
	}
 
	if($_SESSION['ip'] != $_SERVER['REMOTE_ADDR'])
	{
		echo 'U bent niet ingelogd. ';
		echo "<a href='/inloggen.php'>Klik hier</a> om in te loggen";
		die();
	}
 
	$query = mysql_query("SELECT 1 FROM users WHERE user = '".mysql_real_escape_string($_SESSION['user'])."'");
 
	if(mysql_num_rows($query) == 0)
	{
		echo 'U bent niet ingelogd. ';
		echo "<a href='/inloggen.php'>Klik hier</a> om in te loggen";
		die();
	}
}