PHP Fatal error

Programiranje
1
<?php include 'config/config.php'; ?> <?php include 'libraries/database.php'; ?> <?php include 'includes/header.php'; ?> <?php //Create DB Object $db = new Database(); // Create query $query = "SELECT * FROM posts"; // Run Query $posts = $db->select($query); ?> <?php if($posts) : ?> <?php while($row = $posts->fetch_assoc()) : ?> 
    <div class="blog-post">
        <h2 class="blog-post-title"><?php echo $row['title']; ?></h2>
        <p class="blog-post-meta">January 1, 2014 by <a href="#">rdamorei</a></p>
        <h2 class="blog-post-title"></h2>
        <h2 class="blog-post-title"><?php echo $row['body']; ?></h2>
      <a class="readmore" href="post.php?id=1">Read more</a>
    </div><!-- /.blog-post -->
<?php endwhile; ?>
<?php else : ?>

There are no posts yet!

<?php endif; ?> <?php include 'includes/footer.php'; ?>

database

<?php class Database { public $host = DB_HOST; public $username = DB_USER; public $password = DB_PASS; public $db_name = DB_NAME; public $link; public $error; /* * Class Constructor */ public function _construct(){ // Call Connect function $this->connect(); } /* * Connector */ private function connect (){ $this->link = new mysqli ($this->host, $this->username, $this->password, $this->db_name); if (!$this->link){ $this->error = "Conection Faile: ".$this->link->connect_error; return false; } } /* * Select */ public function select($query){ $result = $this->link->query($query) or die($this->link->error.__LINE__); if ($result->num_rows > 0 ){ return $result; }else { return false; } } /* * Insert */ public function insert($query){ $insert_row = $this->link->query($query) or die($this->link->error.__LINE__); // Validate insert if($insert_row){ header("Location: index.php?msg=$".urlencode('Record Added')); exit(); } else { die('Error: ('.$this->link->errno.') '.$this->link->error); } } /* * Update */ public function update($query){ $update_row = $this->link->query($query) or die($this->link->error.__LINE__); // Validate insert if($update_row){ header("Location: index.php?msg=$".urlencode('Record Updated')); exit(); } else { die('Error: ('.$this->link->errno.') '.$this->link->error); } } /* * Delete */ public function delete($query){ $delete_row = $this->link->query($query) or die($this->link->error.__LINE__); // Validate insert if($delete_row){ header("Location: index.php?msg=$".urlencode('Record Delete')); exit(); } else { die('Error: ('.$this->link->errno.') '.$this->link->error); } } } Izbacuje mi: Fatal error: Call to a member function query() on null in Database.php on line 38 Ako obrisem ovaj upit na bazu i index.php onda mi neizbacuje grešku ako probam izvršiti upit onda mi izbacuje fatal error
2

Jel iz te greske ne mozes zakljuciti zasto se dogadja? Greska je poprilicno citljiva.

Pokusavas pozvati metodu query() na null vrijednosti, a metode se mogu zvati na objektima.

Ako pogledas liniju koju ti veli (38), vidis da se pokusava pozvati
$this->link->query(), dakle $this->link ti je null.

Ako pogledas constructor metodu, vidis da tamo nesto ne stima i da se ne moze spojiti na bazu. Provjeri credentialse, odnosno tamo gdje se definiraju DB_HOST, DB_USER, DB_PASS i DB_NAME konstante.

3