PHP/SQL - pagination for fuzzy search results - php

Question

I have created a search function for the products on my site and I tried to put in pagination so that it is not just a big long list of results. So I started off with something like this:
**Note: I just replaced $_GET['search_term'] with 'whatever' just for this example, and where I have var_dump() I have a function that displays the products for each id in the array it is given.
$term = 'whatever'; //$_GET['search_term'];
$new_term = '%'.$term.'%';
if(isset($_GET['page'])){
$page = $_GET['page'];
}else{
$page = 1;
}
$per_page = 20;
$last_page = ceil($resultCount/$per_page);
if($page<1){
$page = 1;
}else if($page>$last_page){
$page = $last_page;
}
$pagination = "";
$limit = "LIMIT ".($page-1)*$per_page.",".$per_page;
if($last_page!=1){
if($page!=1){
$prev = $page-1;
$pagination .= "<a class='pagination' href='store'><<</a>";
$pagination .= "<a class='pagination' href='store/$prev'><</a>";
}
for($i=$page-2; $i<=$page+2; $i++){
if($i>0 && $i<=$last_page){
if($i == $page){
$pagination .= "<a class='pagination selected'>$i</a>";
}else{
$pagination .= "<a class='pagination' href='store/$i'>$i</a>";
}
}
}
if($page!=$last_page){
$next = $page+1;
$pagination .= "<a class='pagination' href='store/$next'>></a>";
$pagination .= "<a class='pagination' href='store/$last_page'>>></a>";
}
}
if(isset($term)){
echo $pagination;
$ids = [];
$params = [$new_term];
$sql = "SELECT * FROM products WHERE name LIKE ? $limit";
$stmt = DB::run($sql,$params);
$resultCount = $stmt->rowCount();
if($resultCount > 0){
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
$id = $row["pro_id"];
$params3 = [$id];
$sql3 = "SELECT * FROM products WHERE id=?";
$stmt3 = DB::run($sql3,$params3);
while($row = $stmt3->fetch(PDO::FETCH_ASSOC)){
$id = $row["id"];
array_push($ids,$id);
}
}
var_dump($ids);
}
echo $pagination;
}
This worked fine, but then I wanted to make it a fuzzy search so I did:
$term = 'whatever'; //$_GET['search_term'];
$new_term = '%'.$term.'%';
$params = [$new_term];
$sql = "SELECT * FROM products WHERE name LIKE ?";
$stmt = DB::run($sql,$params);
$resultCount = $stmt->rowCount();
if($resultCount < 1){
$sql = "SELECT * FROM products";
$stmt = DB::run($sql);
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
$id = $row["pro_id"];
$result = $row[$lang];
similar_text($term,$result,$similarity);
$similar_array[$similarity][] = $id;
}
$closest_match = array_keys($similar_array);
rsort($closest_match);
$match_count = count($closest_match);
$similar_ids = [];
for($i=0; $i<$match_count; $i++){
foreach($similar_array[$closest_match[$i]] as $id){
array_push($similar_ids,$id);
}
}
$resultCount = count($similar_ids);
}
if(isset($_GET['page'])){
$page = $_GET['page'];
}else{
$page = 1;
}
$per_page = 20;
$last_page = ceil($resultCount/$per_page);
if($page<1){
$page = 1;
}else if($page>$last_page){
$page = $last_page;
}
$pagination = "";
$limit = "LIMIT ".($page-1)*$per_page.",".$per_page;
if($last_page!=1){
if($page!=1){
$prev = $page-1;
$pagination .= "<a class='pagination' href='store'><<</a>";
$pagination .= "<a class='pagination' href='store/$prev'><</a>";
}
for($i=$page-2; $i<=$page+2; $i++){
if($i>0 && $i<=$last_page){
if($i == $page){
$pagination .= "<a class='pagination selected'>$i</a>";
}else{
$pagination .= "<a class='pagination' href='store/$i'>$i</a>";
}
}
}
if($page!=$last_page){
$next = $page+1;
$pagination .= "<a class='pagination' href='store/$next'>></a>";
$pagination .= "<a class='pagination' href='store/$last_page'>>></a>";
}
}
if(isset($term)){
echo $pagination;
$ids = [];
$params = [$new_term];
$sql = "SELECT * FROM products WHERE name LIKE ? $limit";
$stmt = DB::run($sql,$params);
$resultCount = $stmt->rowCount();
if($resultCount > 0){
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
$id = $row["pro_id"];
$params3 = [$id];
$sql3 = "SELECT * FROM products WHERE id=?";
$stmt3 = DB::run($sql3,$params3);
while($row = $stmt3->fetch(PDO::FETCH_ASSOC)){
$id = $row["id"];
array_push($ids,$id);
}
}
var_dump($ids);
}else{
var_dump($similar_ids);
}
echo $pagination;
}
There was probably a much better way of doing this but this is what I have. My question then is how can I get the pagination to work here for the fuzzy results ($similar_ids)? I was thinking of some sort of function that will splice the array depending on the page number but I am not sure how I would go about this.

Answer 1

This does not answer your question, but I'm going to say these anyway:
Looking closely, you have a possible sql injection bug in handling of $limit.
Also, using a search index like Apache Solr or ElasticSearch would give you pagination nearly for free anyway. You might want to look into that. Setting up a dedicated index is another can of worms, yes, but then you would also have more and better options to handle that fuzzy search part too.