Automatický zápis do SQL (nevyžádaný) Wordpress

$datum = $_POST['datum'];
$text = $_POST['text'];

$con=mysqli_connect("","","","");
// Check connection
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
mysqli_set_charset($con, 'utf8'); // <- add this too
mysqli_query($con, "SET NAMES 'utf8';");
mysqli_query($con, "SET CHARACTER SET 'utf8';");
mysqli_query($con, "SET COLLATION_CONNECTION = 'utf8_unicode_ci';");
// escape variables for security
$datum = mysqli_real_escape_string($con, $_POST['datum']);
$text = mysqli_real_escape_string($con, $_POST['text']);
;
$sql="INSERT INTO blog (datum,text)
VALUES ('$datum','$text')";
if (!mysqli_query($con,$sql)) {
  die('Error: ' . mysqli_error($con));
}
mysqli_close($con);

$link = mysql_connect('', '', '');
if (!$link) {
    die('Could not connect');
}
$db_selected = mysql_select_db('', $link);
if (!$db_selected) {
    die ('Can not use db');
}
$datum = mysql_real_escape_string($datum);
$text = mysql_real_escape_string($text);

mysql_query("SET NAMES 'utf8'");
mysql_query("INSERT INTO blog (datum,text) VALUES ('".$datum."','".$text."')") or die(mysql_error())

$users = array(
    'jmeno1' => 'heslo1',
    'jmeno2' => 'heslo2'
);

<?php
  $heslo = $_POST["heslo"];
  if ($heslo == "*****")
    echo "<h3 style=\"color:green\">Vše je OK, nyní můžeš napsat příspěvek :-)</h3><form action=\"blogdatabaze.php\" method=\"POST\" style=\" background-color:#fff; text-align:center\"> 
        
          <span>Datum</span>   
          <input type=\"text\" name=\"datum\" placeholder=\"datum\" id=\"datum\" required value=\"\" style=\" text-align: center; height:100%; width:100%\" >
          <br>
          <span>Text postu (mohou se používat TAGY na úpravu textu)</span>   
          <textarea name=\"text\" placeholder=\"text\" id=\"text\" required value=\"\" style=\" text-align: center; height:200px; width:100%\" ></textarea><br> 
<br>
      
          <input type=\"submit\" name=\"send\" class=\"button\" id=\"send\" value=\"Odeslat\" style=\"height:80%; width:80%\" >
        </form><hr><a href=\"email_dotazy.php\" class=\"button\">Dotazy</a>&nbsp;|&nbsp;<a href=\"zadosti_form.php\" class=\"button\">Vyplněné žádosti</a>&nbsp;|&nbsp;<a href=\"meta_des.php\" class=\"button\">Meta DESCRIPTION</a>";

  else
    echo "<h3 style=\"color:red\">HESLO NENÍ OK :-(</h3><br />
    <form action=\"blogpassword.php\" method=\"post\">
Zadej heslo pro vstup: <input type=\"password\" name=\"heslo\"><br /><br /> 
<input type=\"submit\" value=\"Odeslat heslo\"> 
</form> 
    ";
        ?>