Passing arguments in function pdo php - php

Question

I created a function to grab data from my database. I want this function to be reusable just by placing correct arguments for different tables. Here's what I've done :
public function selectdata($table, $arguments='*', $where = null){
if($this->isconnect){
//check whether users put column names in the select clause
if(is_array($arguments)){
$new_args = implode(',', $arguments);
$sql = 'SELECT '.$new_args.' FROM '.$table;
} else {
$sql = 'SELECT '.$arguments.' FROM '.$table;
}
//check whether users use the where clause
if($where != null && is_array($where)){
$where = implode(' ', $where);
$sql .= ' WHERE '.$where ;
}
$query = $this->db->query($sql);
$query -> SetFetchMode(PDO::FETCH_NUM);
while($row = $query->fetch()){
print_r($row);
}
} else {
echo 'failed, moron';
}
}
And this is the way to run the function :
$columnname = array('bookname');
$where = array('bookid','=','2');
echo $database-> selectdata('buku', $columnname, $where);
The code worked quite decently so far, but I'm wondering how I want to use $where but without $columnname in the function. How do I pass the arguments in the function?
And could you point to me the better way to create a function to grab data using PDO?

Answer 1

Just use a PDO class which can look like this:
<?php
class DB_Connect{
var $dbh;
function __construct(){
$host = "xxx";
$db = "xxx";
$user = "xxx";
$password = "xxx";
$this -> dbh = $this -> db_connect($host, $db, $user, $password);
}
public function getDBConnection(){
return $this -> dbh;
}
protected function db_connect($host, $db, $user, $password){
//var_dump($host, $db, $user, $password);exit();
try {
$dbh = new PDO("mysql:host=$host;dbname=$db", $user, $password);
}
catch(PDOException $err) {
echo "Error: ".$err->getMessage()."<br/>";
die();
}
return $dbh;
}
public function query($statement){
$keyword = substr(strtoupper($statement), 0, strpos($statement, " "));
$dbh = $this->getDBConnection();
if($dbh){
try{
$sql = $dbh->prepare($statement);
$exe = $sql->execute();
}
catch(PDOException $err){
return $err->getMessage();
}
switch($keyword){
case "SELECT":
$result = array();
while($row = $sql->fetch(PDO::FETCH_ASSOC)){
$result[] = $row;
}
return $result;
break;
default:
return $exe;
break;
}
}
else{
return false;
}
}
}
?>
Now you can include that class and create an object with $dbh = new DB_Connect; and call every statement you want just with the reference on $dbh->query($statement)
This is my prefered way to do this.
EDIT: If you want to use a statement on another Database, just use the __construct($db) method to pass your database name on object creation