How To Get Values Out of An Array Inside Of A Class - php

Question

I have a form that is passing array values to create_parts.php, then I am trying to pass those values to the parts class to insert into the database. At this point I am just lost... The form passes to create_parts.php, I can echo the results of the of the array. However in my class I cant get any values thus, my insert into the database is just a bunch of NULL.
<?php
include_once '../config/database.php';
include_once '../objects/parts_object.php';
$database = new Database();
$db = $database->getConnection();
$parts= new parts($db);
$parts->est_part_idArr=$_POST['est_part_id'];
$parts->part_qtyArr=$_POST['part_qty'];
$parts->part_numArr=$_POST['part_num'];
$parts->part_discArr=$_POST['part_disc'];
$parts->part_costArr=$_POST['part_cost'];
$parts->create();
I am able to to echo out the results here and get
{"est_part_idArr":["123","124"],"part_qtyArr":["4","6"],"part_numArr":
["2334","3344"],"part_discArr":["part","parts"],"part_costArr":["56","33"]
and echo the $stmt
{"queryString":"INSERT INTO \r\n partsT\r\n SET \r\n est_part_id=:est_part_id, part_qty=:part_qty, part_num=:part_num, part_disc=:part_disc, part_cost=:part_cost"}
However in part_object.php I cant get anything to work. I can it to insert to the database but it is all NULL.
class parts{
private $conn;
private $table_name = "partsT";
public $est_part_idArr;
public $part_qtyArr;
public $part_numArr;
public $part_discArr;
public $part_costArr;
public function __construct($db){
$this->conn = $db; }
function create(){
$query = "INSERT INTO
" . $this->table_name . "
SET
est_part_id=:est_part_id, part_qty=:part_qty, part_num=:part_num, part_disc=:part_disc, part_cost=:part_cost";
$stmt = $this->conn->prepare($query);
if(!empty($this->$est_part_idArr)){
for ($i = 0; $i < count($this->$est_part_idArr); $i++) {
if(!empty($this->$est_part_idArr[$i])){
$est_part_id = $this->$est_part_idArr[$i];
$part_qty = $this->$part_qtyArr[$i];
$part_num = $this->$part_numArr[$i];
$part_disc = $this->$part_discArr[$i];
$part_cost = $this->$part_costArr[$i];
$stmt->execute(array(
':est_part_id' => $est_part_id,
':part_qty' => $part_qty,
':part_num' => $part_num,
':part_disc' => $part_disc,
':part_cost' => $part_cost));
}
}
}
$this->est_part_idArr=htmlspecialchars(strip_tags($this->est_part_idArr));
$this->part_qtyArr=htmlspecialchars(strip_tags($this->part_qtyArr));
$this->part_numArr=htmlspecialchars(strip_tags($this->part_numArr));
$this->part_discArr=htmlspecialchars(strip_tags($this->part_discArr));
$this->part_costArr=htmlspecialchars(strip_tags($this->part_costArr));
$stmt->bindParam(":est_part_id", $this->est_part_idArr[0]);
$stmt->bindParam(":part_qty", $this->part_qtyArr[0]);
$stmt->bindParam(":part_num", $this->part_numArr[0]);
$stmt->bindParam(":part_disc", $this->part_discArr[0]);
$stmt->bindParam(":part_cost", $this->part_costArr[0]);
if($stmt->execute()){
return true;
}else{
return false;
}
}
At this point I know
public $est_part_idArr;
public $part_qtyArr;
public $part_numArr;
public $part_discArr;
public $part_costArr;
is wrong I just cant get anything to work.

Answer 1

You are missing some $this in front of your variables to access your public class members. Let us take this line for example:
$est_part_id = $est_part_idArr[$i];
which in my opinion should look like this:
$est_part_id = $this->est_part_idArr[$i];
On the other hand when you bind your parameters some lines down the code you're using something like this:
$stmt->bindParam(":est_part_id", $this->est_part_id);
Which I believe should be
$stmt->bindParam(":est_part_id", $this->est_part_idArr);
or
$stmt->bindParam(":est_part_id", $this->est_part_idArr[0]);