<?phpclass db extends PDO {    private $error;    private $sql;    private $bind;    private $errorCallbackFunction;    private $errorMsgFormat;    public function __construct($dsn, $user="", $passwd="") {        $options = array(            PDO::ATTR_PERSISTENT => true,             PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION        );        try {            parent::__construct($dsn, $user, $passwd, $options);        } catch (PDOException $e) {            $this->error = $e->getMessage();        }    }    private function debug() {        if(!empty($this->errorCallbackFunction)) {            $error = array("Error" => $this->error);            if(!empty($this->sql))                $error["SQL Statement"] = $this->sql;            if(!empty($this->bind))                $error["Bind Parameters"] = trim(print_r($this->bind, true));            $backtrace = debug_backtrace();            if(!empty($backtrace)) {                foreach($backtrace as $info) {                    if($info["file"] != __FILE__)                        $error["Backtrace"] = $info["file"] . " at line " . $info["line"];                    }                    }            $msg = "";            if($this->errorMsgFormat == "html") {                if(!empty($error["Bind Parameters"]))                    $error["Bind Parameters"] = "<pre>" . $error["Bind Parameters"] . "</pre>";                $css = trim(file_get_contents(dirname(__FILE__) . "/error.css"));                $msg .= ‘<style type="text/css">‘ . "\n" . $css . "\n</style>";                $msg .= "\n" . ‘<div class="db-error">‘ . "\n\t<h3>SQL Error</h3>";                foreach($error as $key => $val)                    $msg .= "\n\t<label>" . $key . ":</label>" . $val;                $msg .= "\n\t</div>\n</div>";            }            elseif($this->errorMsgFormat == "text") {                $msg .= "SQL Error\n" . str_repeat("-", 50);                foreach($error as $key => $val)                    $msg .= "\n\n$key:\n$val";            }            $func = $this->errorCallbackFunction;            $func($msg);        }    }    public function delete($table, $where, $bind="") {        $sql = "DELETE FROM " . $table . " WHERE " . $where . ";";        $this->run($sql, $bind);    }    private function filter($table, $info) {        $driver = $this->getAttribute(PDO::ATTR_DRIVER_NAME);        if($driver == ‘sqlite‘) {            $sql = "PRAGMA table_info(‘" . $table . "‘);";            $key = "name";        }        elseif($driver == ‘mysql‘) {            $sql = "DESCRIBE " . $table . ";";            $key = "Field";        }        else {                $sql = "SELECT column_name FROM information_schema.columns WHERE table_name = ‘" . $table . "‘;";            $key = "column_name";        }            if(false !== ($list = $this->run($sql))) {            $fields = array();            foreach($list as $record)                $fields[] = $record[$key];            return array_values(array_intersect($fields, array_keys($info)));        }        return array();    }    private function cleanup($bind) {        if(!is_array($bind)) {            if(!empty($bind))                $bind = array($bind);            else                $bind = array();        }        return $bind;    }    public function insert($table, $info) {        $fields = $this->filter($table, $info);        $sql = "INSERT INTO " . $table . " (" . implode($fields, ", ") . ") VALUES (:" . implode($fields, ", :") . ");";        $bind = array();        foreach($fields as $field)            $bind[":$field"] = $info[$field];        return $this->run($sql, $bind);    }    public function run($sql, $bind="") {        $this->sql = trim($sql);        $this->bind = $this->cleanup($bind);        $this->error = "";        try {            $pdostmt = $this->prepare($this->sql);            if($pdostmt->execute($this->bind) !== false) {                if(preg_match("/^(" . implode("|", array("select", "describe", "pragma")) . ") /i", $this->sql))                    return $pdostmt->fetchAll(PDO::FETCH_ASSOC);                elseif(preg_match("/^(" . implode("|", array("delete", "insert", "update")) . ") /i", $this->sql))                    return $pdostmt->rowCount();            }            } catch (PDOException $e) {            $this->error = $e->getMessage();                $this->debug();            return false;        }    }    public function select($table, $where="", $bind="", $fields="*") {        $sql = "SELECT " . $fields . " FROM " . $table;        if(!empty($where))            $sql .= " WHERE " . $where;        $sql .= ";";        return $this->run($sql, $bind);    }    public function setErrorCallbackFunction($errorCallbackFunction, $errorMsgFormat="html") {        //Variable functions for won‘t work with language constructs such as echo and print, so these are replaced with print_r.        if(in_array(strtolower($errorCallbackFunction), array("echo", "print")))            $errorCallbackFunction = "print_r";        if(function_exists($errorCallbackFunction)) {            $this->errorCallbackFunction = $errorCallbackFunction;                if(!in_array(strtolower($errorMsgFormat), array("html", "text")))                $errorMsgFormat = "html";            $this->errorMsgFormat = $errorMsgFormat;            }        }    public function update($table, $info, $where, $bind="") {        $fields = $this->filter($table, $info);        $fieldSize = sizeof($fields);        $sql = "UPDATE " . $table . " SET ";        for($f = 0; $f < $fieldSize; ++$f) {            if($f > 0)                $sql .= ", ";            $sql .= $fields[$f] . " = :update_" . $fields[$f];         }        $sql .= " WHERE " . $where . ";";        $bind = $this->cleanup($bind);        foreach($fields as $field)            $bind[":update_$field"] = $info[$field];                return $this->run($sql, $bind);    }}    ?>