gistfile1.php

<?php
   class SQLQuery {
    
    public $query = "";
    private $allowed_query_types = array(
        'insert'
      , 'delete'
      , 'update'
      , 'select'
    );
    
    public function __construct($query) {
      $this->query = trim($query);
      $query_type = $this->query_type();
      
      if(in_array($query_type, $this->allowed_query_types)) {
        return $this->$query_type();
      } else {
        return FALSE;
      }
      
    }

    private function query_type() {
      $query_parts = explode(" ", $this->query);
      $query_type = strtolower($query_parts[0]);
      return $query_type;
    }
    
    public function insert() {
      $result = mysql_query($this->query);
      if($result) {
        return mysql_insert_id();
      } else {
        return FALSE;
      }
    }
    
    public function select() {
      $return_array = array();
      $result = mysql_query($this->query);
      
      if($result) {
        if(mysql_num_rows($result) == 0) {
          return FALSE;
        } else {
          while ($row = mysql_fetch_assoc($result)) {
            $return_array[] = $row;
          }
          
          return $return_array;
        }
      } else {
        return FALSE;
      }
    }
    
    public function delete() {
      return mysql_query($this->query);
    }
    
    public function update() {
      return mysql_query($this->query);
    }
    
  }
?>