Notice e Strict Standards su script per connettersi a un database

[Maures]

Buongiorno a tutti,
da qualche settimana sono entrato nel mondo della programmazione web e sto affrontando le basi di php.
Fino a ora tutto bene, anche grazie a un manuale che si intitola PHP5 Elementi di programmazione della O'reilly (non intendo fare pubblicità, in caso avvisatemi e cancello il titolo)

Sono arrivato al punto in cui è presente un listato per inserire i dati all'interno di un database che è questo:

<?php// Load PEAR DB
require 'DB.php';
// Load the form helper functions
require 'formhelpers.php';
// Connect to the database
$db = DB::connect('mysql://root:root@localhost/restaurant');
if (DB::isError($db)) { die ("Can't connect: " . $db->getMessage()); }
// Set up automatic error handling
$db->setErrorHandling(PEAR_ERROR_DIE);
// The main page logic:
// - If the form is submitted, validate and then process or redisplay
// - If it's not submitted, display
if ($_POST['_submit_check']) {    // If validate_form() returns errors, pass them to show_form()   
 if ($form_errors = validate_form()) {       
 show_form($form_errors);   
 } else {     
   // The submitted data is valid, so process it     
   process_form();  
  }
} else {   
 // The form wasn't submitted, so display  
  show_form();}
function show_form($errors = '') {   
 // If the form is submitted, get defaults from submitted parameters    
if ($_POST['_submit_check']) {     
   $defaults = $_POST;  
  } else {    
    // Otherwise, set our own defaults: price is $5    
    $defaults = array('price' => '5.00');    }    
    // If errors were passed in, put them in $error_text (with HTML markup)  
  if (is_array($errors)) {   
     $error_text = '<tr><td>You need to correct the following errors:';      
  $error_text .= '</td><td><ul><li>';     
   $error_text .= implode('</li><li>',$errors);   
     $error_text .= '</li></ul></td></tr>';   
 } else {     
   // No errors? Then $error_text is blank     
   $error_text = '';    }
    // Jump out of PHP mode to make displaying all the HTML tags easier
?>
<form method="POST" action="<?php print $_SERVER['PHP_SELF']; ?>"><table><?php print $error_text ?>
<tr><td>Dish Name:</td><td><?php input_text('dish_name', $defaults) ?></td></tr>
<tr><td>Price:</td><td><?php input_text('price', $defaults) ?></td></tr>
<tr><td>Spicy:</td><td><?php input_radiocheck('checkbox','is_spicy', $defaults, 'yes'); ?> Yes</td></tr>
<tr><td colspan="2" align="center"><?php input_submit('save','Order'); ?></td></tr>
</table><input type="hidden" name="_submit_check" value="1"/></form>
<?php      } // The end of show_form()
function validate_form() {   
 $errors = array();
    // dish_name is required   
 if (! strlen(trim($_POST['dish_name']))) {   
     $errors[] = 'Please enter the name of the dish.';    }
    // price must be a valid floating point number and   
  // more than 0   
 if (floatval($_POST['price'] <= 0)) {     
   $errors[] = 'Please enter a valid price.';    }
    return $errors;}
function process_form() {   
 // Access the global variable $db inside this function   
 global $db;
    // Get a unique ID for this dish  
  $dish_id = $db->nextID('dishes');
    // Set the value of $is_spicy based on the checkbox   
 if ($_POST['is_spicy'] == 'yes') {       
 $is_spicy = 1;  
  } else {     
   $is_spicy = 0;  
  }
    // Insert the new dish into the table   
 $db->query('INSERT INTO dishes (dish_id, dish_name, price, is_spicy)                
VALUES (?,?,?,?)',              
 array($dish_id, $_POST['dish_name'], $_POST['price'],              $is_spicy));
    // Tell the user that we added a dish.    
print 'Added ' . htmlentities($_POST['dish_name']) .           ' to the database.';}
?>

i file richiamati all'inizio sono già stati spostati rispettivamente dalla cartella C:\xampp\php\pear per quanto riguarda il file DB.php, mentre il file formhelpers.php è questo:

<?php//print a text box
function input_text($element_name, $values) {   
 print '<input type="text" name="' . $element_name .'" value="';  
  print htmlentities($values[$element_name]) . '">';}
//print a submit button
function input_submit($element_name, $label) {   
 print '<input type="submit" name="' . $element_name .'" value="';   
 print htmlentities($label) .'"/>';}
//print a textarea
function input_textarea($element_name, $values) {   
 print '<textarea name="' . $element_name .'">';  
  print htmlentities($values[$element_name]) . '</textarea>';}
//print a radio button or checkbox
function input_radiocheck($type, $element_name, $values, $element_value) { 
   print '<input type="' . $type . '" name="' . $element_name .'" value="' . $element_value . '" '; 
   if ($element_value == $values[$element_name]) {        
print ' checked="checked"';   
 }   
 print '/>';}
//print a <select> menu
function input_select($element_name, $selected, $options, $multiple = false) {  
  // print out the <select> tag    
print '<select name="' . $element_name;  
  // if multiple choices are permitted, add the multiple attribute   
 // and add a [] to the end of the tag name    
if ($multiple) { print '[]" multiple="multiple'; }   
 print '">';
    // set up the list of things to be selected  
  $selected_options = array();    
if ($multiple) {       
 foreach ($selected[$element_name] as $val) {     
       $selected_options[$val] = true;       
 }    
} else {     
   $selected_options[ $selected[$element_name] ] = true;    }
    // print out the <option> tags   
 foreach ($options as $option => $label) {     
   print '<option value="' . htmlentities($option) . '"';    
    if ($selected_options[$option]) {      
      print ' selected="selected"';     
   }    
    print '>' . htmlentities($label) . '</option>';  
  }   
 print '</select>';}?>

pensando di aver fatto tutto correttamente, carico il file ma lo script mi dà questi errori:

Strict Standards: Non-static method DB::connect() should not be called statically in C:\xampp\htdocs\esempi\730.php on line 8

Strict Standards: Non-static method DB::parseDSN() should not be called statically in C:\xampp\htdocs\esempi\DB.php on line 520

Strict Standards: Non-static method DB::isError() should not be called statically in C:\xampp\htdocs\esempi\DB.php on line 557

Strict Standards: Non-static method DB::isError() should not be called statically in C:\xampp\htdocs\esempi\730.php on line 9

Notice: Undefined index: _submit_check in C:\xampp\htdocs\esempi\730.php on line 16

Notice: Undefined index: _submit_check in C:\xampp\htdocs\esempi\730.php on line 31

ho provato a cercare un po' su internet, ma credo che rivolgendomi a voi possa risolvere prima il mio problema.

Metto in allegato anche uno screen di come viene visualizzata la pagina.

Grazie e a presto

Edit: mi ha sfasato tutti gli a capo, spero di essere riuscito a sistemarli tutti