select with join using a standard php function - php

Question

Im trying to use a php function to select data from a database, Im using a "standard" php function:
function select($table, $where, $other=''){
try{
$a = array();
$w = "";
$other=" ".$other;
foreach ($where as $key => $value) {
$w .= " and " .$key. " like :".$key;
$a[":".$key] = $value;
}
$stmt = $this->bd->prepare("select * from ".$table." where 1=1 ". $w.$other);
$stmt->execute($a);
$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
if(count($rows)<=0){
$reponse["statut"] = "warning";
$reponse["message"] = "no data found.";
}else{
$reponse["statut"] = "Success";
$reponse["message"] = "Success";
}
$reponse["data"] = $rows;
}catch(Exception $e){
$reponse["statut"] = "Error";
$reponse["message"] = 'selection failed: ' .$e->getMessage();
$reponse["data"] = null;
}
return $reponse;
}
The function works satisfyingly I faced problems only when I aimed to use a join and selecting from two tables.
say we have these two tables:
id-cat | cat-name |
1 | aaaaaa |
2 | aaadda |
3 | saaaca |
4 | ahhaaa |
and
id-cat | sub-cat |
1 | 2 |
1 | 3 |
1 | 4 |
2 | 3 |
2 | 4 |
How to select the a category's subs name with given id-cat using MY FUNCTION ??

Answer 1

You just need a simple LEFT JOIN to the second table, using the column that exists in both tables.
$stmt = $this->bd->prepare("SELECT *
FROM $table
LEFT JOIN $table2 USING id-cat
WHERE 1=1 ". $w.$other);