How to fix this error “mysql_fetch_assoc() expects parameter 1 to be resource, boolean given in”? [duplicate]

Answer 1

To ensure that the while only executes when the query succeeded you could write:

if ($query)
while($res = mysql_fetch_assoc($query)) {
    mysql_query("UPDATE products SET publicado = '0' WHERE auto_pub = ".$hoje) or die(mysql_error());
}

Notice the absence of the $query= assignment within the loop. For an UPDATE you don't want to read any results. And you are checking the outcoume with the or die already anyway.

Answer 2

$query is used before the while and inside the while... Change the name of the variable to $query2, for example:

$hoje = strtotime(date("d-m-Y"));

$db = new DBConfig();
$db -> config();
$db->conn();
$query = mysql_query("SELECT * FROM products WHERE auto_pub = ".$hoje) or die(mysql_error());

while($res = mysql_fetch_assoc($query)) {
    $query2 = mysql_query("UPDATE products SET publicado = '0' WHERE auto_pub = ".$hoje) or die(mysql_error());
}

$db->close();

Hope it helps.

Answer 3

Probably, your mysql_query returned false due to syntax error (your date isn't quoted).