Question

So…

class postQuery {

public function __construct($args = NULL){

    $post_type = $args['post_type'];
    $limit = $args['limit'];
    $category = $args['cat'];

    global $sql;

    $sql = $sql->query('SELECT * FROM posts');
    $sql = $sql->fetchAll(PDO::FETCH_ASSOC);
}

public function havePosts() {

    global $sql;
    global $rowNum;

    $rowNum = 0;
    $rowMax = count($sql);

    while($rowNum <= $rowMax) {
        return $rowNum;
        $rowNum++;
    }

}
}

the havePosts() function should run while $rowNum < $rowMax… everything ok this far…

but now, i want to create a while statement with this function, like this:

$con = new postQuery();

while($con->havePosts()){
    global $sql;
    global $rowNum;

    return $sql[$rowNum]['title'];
}

How can i return the data given by my WHILE inside the Function one by one?

Answer 1

Your postQuery class may look like this:

class postQuery() {

  private $currentRow = 0;

  public function havePosts() {
    global $sql;
    if ($this->currentRow == count($sql) - 1)
      return FALSE;
    $this->currentRow++;
    return $this->currentRow - 1;
  }
}

And then you can loop through posts:

while(($rowNum = $conn->havePosts()) !== FALSE) {
  echo $sql[$rowNum]['title'];
}

Note that my example is not best practice at all. You should avoid using global variables and lot of data you can store to class member variables (e.g. count($sql)). You should also fix my arithmetic to avoid using magic operations like $this->currentRow + 1.