Use multiple where condition in mysql - php

Question

i have a select field named categories[] with multiple select and i written one on change function so on change fuction it will go the controller as an array of id's now what i want is i want to select foods from mysql table with these categories
<select name="categories[]">
<?php
foreach ($category as $c) {
?>
<option value="<?php echo $c->category_id; ?>"><?php echo $c->category_name;?></option>
<?php
}
?>
</select>
controller
public function get_foods(){
$categories = $this->input->post(NULL,true);
$sql = $this->subscription->get_foods($categories);
$result = array(
'result' => $sql
);
echo json_encode($result);
}
and model
public function get_foods($id){
$sql = "SELECT * FROM food_category fc
LEFT JOIN food f ON fc.food_id=f.food_id
WHERE f.food_status = 1 AND
fc.category_id = $id
ORDER BY f.food_id DESC";
$query = $this->db->query($sql);
return $query->result_array();
}
i want to fetch all the foods in these categories, so i think i should have to use some multiple where condition ?

Answer 1

You just need to store category with each food and when you get the foods you can use a where condition :
$this->db->where('category',$category);

Answer 2

use the where columns in () sql function for this.
for detail description on it. find here
http://www.w3schools.com/sql/sql_in.asp

Answer 3

If this can help, I think you need to post the categories one by one, then get it and put it in one array. Here is a code that may help
public function get_foods()
{
$result = array();
foreach($this->input->post('categories') as $c)
{
$result[] = $this->subscription->get_foods($c);
}
echo json_encode($result);
}
and for the model I suggest making use of AR of CI
public function get_foods($category)
{
$this->db->select('*');
$this->db->from('food_category as fc');
$this->db->join('food as f','fc.food_id = f.food_id','left');
$this->db->where('f.food_status', '1');
$this->db->where('fc.category_id',$category);
$query = $this->db->get();
return $query->result_array();
}
First we make an empty array, then using the foreach in post we get all the foods per category then return them inside the result array.
Hope this helps and if there's any error in the sql since I may have forgotten some of the join, I'd be willing to help again.