Having issue with oop and pdo in php - php

Question

I have a form on a website. This form collects data about an EVENT. The event has 20 fields besides the ID that are in the table that corresponds to the event.
Before I was just taking the ($_POST['submit']) and if true, inserting the event fields into the database using mysql_query.
Now I'm trying to use oop and this pdo and I've pretty much defeated myself at this point. I am sure I'm doing lots of things wrong.
<?php
$str = $_SERVER['DOCUMENT_ROOT'];
include $str."/wp-config.php";
$config['db'] = array(
'host' => DB_HOST,
'username' => DB_USER,
'password' => DB_PASSWORD,
'dbname' => DB_NAME,
'charset' => DB_CHARSET
);
$db = new PDO('mysql:host='.$config['db']['host'].';dbname='.$config['db']['dbname'].';charset='.$config['db']['charset'], $config['db']['username'], $config['db']['password']);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->setAttribute(PDF::ATTR_EMULATE_PREPARES, false);
class match extends event {
public $_matchno;
public $_completed;
function __construct() {
$this->_completed = "N";
}
public function addMatch($matchno) {
$sql = $db->prepare("INSERT INTO wp_hue5gf_match_details (matchno, event_name, dateofmatch, fighttype, comp, matchref, fightclass)
VALUES (".$matchno.", $this->_eventname, $this->_doe, $this->_status, $this->_completed, $this->_refree, $this->_fightclass)");
$sql->execute();
}
}
class event {
public $_promouser;
public $_eventname;
public $_fightclass;
public $_no_of_matches;
public $_status;
public $_doe;
public $_venue;
public $_city;
public $_state;
public $_zip;
public $_sanc_body;
public $_doctor;
public $_refree;
public $_referee2;
public $_judge;
public $_judge2;
public $_judge3;
public $_boxcomm;
public $_descript;
function __construct() {
$this->_promouser = $_SESSION['username'];
$this->_eventname = $_POST['ename'];
$this->_fightclass = $_POST['efightclass'];
$this->_no_of_matches = $_POST['no_of_matches'];
$this->_status = $_POST['estatus'];
$this->_doe = $_POST['year']."-".$_POST['month']."-".$_POST['day'];
$this->_venue = $_POST['venue'];
$this->_city = $_POST['city'];
$this->_state = $_POST['state'];
$this->_country = $_POST['country'];
$this->_zip = $_POST['zip'];
$this->_sanc_body = $_POST['sbody'];
$this->_doctor = $_POST['doctor'];
$this->_refree = $_POST['refree'];
$this->_referee2 = $_POST['refree2'];
$this->_judge = $_POST['judge'];
$this->_judge2 = $_POST['judge2'];
$this->_judge3 = $_POST['judge3'];
$this->_boxcomm = $_POST['boxcom'];
$this->_descript = $_POST['descript'];
}
public function insertEvent() {
$sql = $db->prepare("INSERT INTO event (promouser, eventname, fightclass, no_of_matches, status, doe, venue, city, state, country, zip,
sanc_body, doctor, refree, referee2, judge, judge2, judge3, boxcomm, descript) VALUES ($this->_promouser, $this->_eventname, $this->_fightclass, $this->_no_of_matches, $this->_status, $this->_venue,
$this->_city, $this->_state, $this->_country, $this->_zip, $this->_sanc_body, $this->_doctor, $this->_refree, $this->_referee2, $this->_judge, $this->_judge2, $this->_judge3, $this->_boxcomm, $this->_descript)");
$sql->execute();
}
}
?>
So that is my class page. Now to the add event page. I am clearly doing something way wrong. And I have no idea where to start.
<?php
require_once(bloginfo( 'template_url' ).'/definedClasses.php');
if($_POST['submit'])
{
$event = new event();
event::insertEvent();
for($y=1;$y<= $event->_no_of_matches;$y++)
{
$match = new match();
match::addMatch($y);
}
}
?>
<form name="addevent" method="post" action="" enctype="multipart/form-data" >
<!-- The form here with all these inputs for the post values -->
</form>
I'm sure I'm trying to do too much at once. I should probably trim this down to a much smaller problem then work through it. But I have no clue where to start. I'm not looking for you to do this for me, I am looking for some guidance on what I don't understand and. I'm pretty sure it has something to do with the PDO. if this was mysql_ like it used to be I have a feeling that I would have it running right.
Thanks for taking a peek.

Answer 1

You can't use $db in your classes because they don't know it exists.
What is dependency injection?
Pass the PDO object as a parameter in your constructor
function __construct( PDO $db ) {
$this->$db = $db;
}
Then use $this->db instead of $db
Also use $event->insertEvent() instead of using it statically.
A better approach would be
$event = new Event( $_POST );
$eventSaver = new EvenSaver( $db ); //Name is stupid but you get it
$eventSaver->saveEvent( $event );
but that's for a different time.