INSERT INTO med VALUE('$_POST') funkar inte

$headline = $_POST['headline'];
$post = $_POST['post'];

<?php
$con = mysql_connect("XXXX","XXXX","XXXX");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}

mysql_select_db("XXXX", $con);

$sql="INSERT INTO blogg (headline, post)
VALUES
('$headline','$post')";

if (!mysql_query($sql,$con))
{
die('Error: ' . mysql_error());
}
echo "1 record added";

mysql_close($con)
?>

<?php
// Show all errors
error_reporting(E_ALL);

$great = 'fantastic';

// Won't work, outputs: This is { fantastic}
echo "This is { $great}";

// Works, outputs: This is fantastic
echo "This is {$great}";
echo "This is ${great}";

// Works
echo "This square is {$square->width}00 centimeters broad."; 


// Works, quoted keys only work using the curly brace syntax
echo "This works: {$arr['key']}";


// Works
echo "This works: {$arr[4][3]}";

// This is wrong for the same reason as $foo[bar] is wrong  outside a string.
// In other words, it will still work, but only because PHP first looks for a
// constant named foo; an error of level E_NOTICE (undefined constant) will be
// thrown.
echo "This is wrong: {$arr[foo][3]}"; 

// Works. When using multi-dimensional arrays, always use braces around arrays
// when inside of strings
echo "This works: {$arr['foo'][3]}";

// Works.
echo "This works: " . $arr['foo'][3];

echo "This works too: {$obj->values[3]->name}";

echo "This is the value of the var named $name: {${$name}}";

echo "This is the value of the var named by the return value of getName(): {${getName()}}";

echo "This is the value of the var named by the return value of \$object->getName(): {${$object->getName()}}";

// Won't work, outputs: This is the return value of getName(): {getName()}
echo "This is the return value of getName(): {getName()}";
?>

if (!mysql_query($sql,$con)) {
die('Error: ' . mysql_error());
}
else {
mysql_query($sql);
echo "1 record added";
}

<form action="database.php" method="post">
    <div id="headline">
        <label for="headline">Headline</label><br />
        <input type="text" name="headline">
    </div>

    <div id="post">
        <label for="Post">Post</label><br />
        <textarea name="post" id="text"/></textarea>

        <input id="send" type="submit" />
    </div>
</form>

<?php
    if(isset($_POST['headline'])) {
        mysql_connect("XXXX","XXXX","XXXX") or die('Could not connect: ' . mysql_error());
        mysql_select_db("XXXX") or die('Could not select database: ' . mysql_error());

        $headline = mysql_real_escape_string($_POST['headline']);
        $post = mysql_real_escape_string($_POST['post']);

        $query = "INSERT INTO blogg (headline, post) VALUES ('$headline', '$post')";
        mysql_query($query) or die('Couldn\'t execute query: ' . mysql_error());

        echo "<p>1 record added</p>";
    }
?>