I need to remove duplicates from an array from a specific code - php

Question

I have the following code:
public function ajax()
{
// Contains results
$data = array();
if( isset($this->request->get['keyword']) ) {
// Parse all keywords to lowercase
$keywords = strtolower( $this->request->get['keyword'] );
// Perform search only if we have some keywords
if( strlen($keywords) >= 3 ) {
$parts = explode( ' ', $keywords );
$add = '';
// Generating search
foreach( $parts as $part ) {
$add .= ' AND (LOWER(pd.name) LIKE "%' . $this->db->escape($part) . '%"';
$add .= ' OR LOWER(p.model) LIKE "%' . $this->db->escape($part) . '%")';
}
$add = substr( $add, 4 );
$sql = 'SELECT pd.product_id, pd.name, p.model FROM ' . DB_PREFIX . 'product_description AS pd ';
$sql .= 'LEFT JOIN ' . DB_PREFIX . 'product AS p ON p.product_id = pd.product_id ';
$sql .= 'LEFT JOIN ' . DB_PREFIX . 'product_to_store AS p2s ON p2s.product_id = pd.product_id ';
$sql .= 'WHERE ' . $add . ' AND p.status = 1 ';
$sql .= ' AND p2s.store_id = ' . (int)$this->config->get('config_store_id');
$sql .= ' ORDER BY LOWER(pd.name) ASC, LOWER(p.model) ASC';
$sql .= ' LIMIT 15';
$res = $this->db->query( $sql );
if( $res ) {
$data = ( isset($res->rows) ) ? $res->rows : $res->row;
// For the seo url stuff
$basehref = 'product/product&keyword=' . $this->request->get['keyword'] . '&product_id=';
foreach( $data as $key => $values ) {
$data[$key] = array(
'name' => htmlspecialchars_decode($values['name'] . ' (' . $values['model'] . ')', ENT_QUOTES),
'href' => $this->url->link($basehref . $values['product_id'])
);
}
}
}
}
echo json_encode( $data );
}
So, the array generates a list of products, like for e.g.:
Apple MacBook (Product Model 10)
Apple МакБук (Product Model 10)
The problem is that those two products is actually one and the same product (same product_id) but in different languages, and both have the same URL.
So, what I want to check is, while making the array, the code to check if there is already a product with that product_id in the array, and if there is, not to add another one with the same product_id.
Practically, I don't want the array to generate two or more products with the same product_id.
EDIT: With Marc's code and ghbarratt suggestion work like a charm. A million thanks to you guys, and to all of you here.
P.S. How can I add ASC or DESC for ORDER BY pd.language_id:
$sql .= ' ORDER BY pd.language_id = ' . (int)$this->config->get('config_language_id');
$sql .= ' , LOWER(pd.name) ASC, LOWER(p.model) ASC';

Answer 1

$data = array();
foreach ($res->rows as $values) {
$data[$values['product_id']] = array(
'name' => ...,
'href' => ...
);
}
Guarantees unique product ids only.

Answer 2

The easiest way should be to add another array to track already written ids and check with http://php.net/manual/en/function.in-array.php:
$basehref = 'product/product&keyword=' . $this->request->get['keyword'] . '&product_id=';
$writtenIds = array();
foreach( $data as $key => $values ) {
if(in_array($values['product_id'], $writtenIds))
{
unset($data[$key]);
continue;
}
$data[$key] = array(
'name' => htmlspecialchars_decode($values['name'] . ' (' . $values['model'] . ')', ENT_QUOTES),
'href' => $this->url->link($basehref . $values['product_id'])
);
$writtenIds[] = $values['product_id'];
}

Answer 3

This answer is similar to Marc's except it will preserve the other names in an additional element on the data array for the product_id and it will make sure to remove the sub-arrays that have the same product_id as the first encountered one, which I believe is an important part of what you wanted to do.
$product_ids_added = array();
foreach( $data as $key => $values ) {
$original_key = array_search($values['product_id'], $product_ids_added);
if($original_key===false) {
$data[$key] = array(
'name' => htmlspecialchars_decode($values['name'] . ' (' . $values['model'] . ')', ENT_QUOTES),
'href' => $this->url->link($basehref . $values['product_id'])
);
$product_ids_added[] = $values['product_id'];
}
else {
unset($data[$key]);
if(!isset($data[$original_key]['additional_names'])) $data[$original_key]['additional_names'] = array();
$data[$original_key]['additional_names'][] = htmlspecialchars_decode($values['name'] . ' (' . $values['model'] . ')', ENT_QUOTES);
}
}