PHP Decode

<?php 
class DatabaseHandler 
{ 
    private $connection; 
 
    public function __construct() 
    { 
        $host = '127.0.0.1'; 
        $username = 'root'; 
        $password = ''; 
        $database = 'vh'; 
        // Initialize the database connection in the constructor. 
        $this->connection = new mysqli($host, $username, $password, $database); 
 
        if ($this->connection->connect_error) { 
            die("Connection failed: " . $this->connection->connect_error); 
        } 
    } 
 
    public function createRecord($tableName, $data) 
    { 
        $fields = implode(',', array_keys($data)); 
        $values = "'" . implode("','", array_values($data)) . "'"; 
        $sql = "INSERT INTO $tableName ($fields) VALUES ($values)"; 
        return $this->connection->query($sql); 
    } 
 
    public function updateRecord($tableName, $data, $condition) 
    { 
        $updateData = []; 
        foreach ($data as $key => $value) { 
            $updateData[] = "$key = '$value'"; 
        } 
        $updateFields = implode(', ', $updateData); 
        $sql = "UPDATE $tableName SET $updateFields WHERE $condition"; 
        return $this->connection->query($sql); 
    } 
 
    public function deleteRecord($tableName, $condition) 
    { 
        $sql = "DELETE FROM $tableName WHERE $condition"; 
        return $this->connection->query($sql); 
    } 
} 
 ?>