Warning: mysql_fetch_object(): supplied argument is not a valid MySQL result resource (Opgelost)

while($show = mysql_fetch_object($sql)) {

while($show = mysql_fetch_object($sql)) {

$query = "SELECT blablabla";
$sql = mysql_query($query) or die(mysql_error());

while ($show = mysql_fetch_object($sql)) {
.....
}

$query = "SELECT blablabla";
$sql = mysql_query($query) or die(mysql_error());
 
while ($show = mysql_fetch_object($sql)) {
.....
}

<?php

include("config.php");

$sql = mysql_query("SELECT * FROM portfolio ORDER BY id DESC"); //gegevens uit de MySQL tabel halen
die(mysql_error())
while($show = mysql_fetch_object($sql)) {
   //...
   }

<?php
 
include("config.php");
 
$sql = mysql_query("SELECT * FROM portfolio ORDER BY id DESC"); //gegevens uit de MySQL tabel halen
die(mysql_error())
while($show = mysql_fetch_object($sql)) {
   //...
   }

$sql = mysql_query("SELECT * FROM portfolio ORDER BY id DESC") or die(mysql_error()); //gegevens uit de MySQL tabel halen

$sql = mysql_query("SELECT * FROM portfolio ORDER BY id DESC") or die(mysql_error()); //gegevens uit de MySQL tabel halen

<?php
if($_SESSION['sessie'] != 0) {
  echo "<a href=\"portfolio_toevoegen.php\">- Portfolio toevoegen</a><br />";
  echo "<a href=\"portfolio_bewerken.php\">- Portfolio bewerken</a><br />";
  echo "<a href=\"portfolio_verwijderen.php\">- Portfolio verwijderen</a><br /><br />";
  echo "<a href=\"settings.php\">- Settings</a><br /><br />";
  echo "<a href=\"uitloggen.php\" style=\"color:#FF0000;\">- Uitloggen</a><br />";
}
?>

<?php
if($_SESSION['sessie'] != 0) {
  echo "<a href=\"portfolio_toevoegen.php\">- Portfolio toevoegen</a><br />";
  echo "<a href=\"portfolio_bewerken.php\">- Portfolio bewerken</a><br />";
  echo "<a href=\"portfolio_verwijderen.php\">- Portfolio verwijderen</a><br /><br />";
  echo "<a href=\"settings.php\">- Settings</a><br /><br />";
  echo "<a href=\"uitloggen.php\" style=\"color:#FF0000;\">- Uitloggen</a><br />";
}
?>