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end of one book and beginning of another.  Based upon my ee questions, where should I go? Or use another book?

Posted on 2014-03-31
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Last Modified: 2014-04-05
End of one book and beginning of another.  Based upon my ee questions, where should I go? Or use another book?

I am working in the beginning of Matt Zandastra objects patterns and practice 4th edition.
I may not understand, but at least I can follow in nusphere ide debug (call stack, local variables)


I am working at the end of Larry Ulman
 PHP Advanced and Object-Oriented Programming: Visual QuickPro Guide (3rd Edition)
where there is production level code.  No longer philosophical.  

<?php # login.php - 9.11
// This page both displays and handles the login form.

// Need the utilities file:
require('includes/utilities.inc.php');

// Create a new form:
set_include_path(get_include_path() . PATH_SEPARATOR . 'C:/Users/Acer/AppData/Roaming/PEAR/pear/');
require('HTML/QuickForm2.php');
$form = new HTML_QuickForm2('loginForm');

// Add the email address:
$email = $form->addElement('text', 'email');
$email->setLabel('Email Address');
$email->addFilter('trim');
$email->addRule('required', 'Please enter your email address.');
$email->addRule('email', 'Please enter your email address.');

// Add the password field:
$password = $form->addElement('password', 'pass');
$password->setLabel('Password');
$password->addFilter('trim');
$password->addRule('required', 'Please enter your password.');

// Add the submit button:
$form->addElement('submit', 'submit', array('value'=>'Login'));

// Check for a form submission:
if ($_SERVER['REQUEST_METHOD'] == 'POST') { // Handle the form submission
    
    // Validate the form data:
    if ($form->validate()) {
        
        // Check against the database:
        $q = 'SELECT id, userType, username, email FROM users WHERE email=:email AND pass=SHA1(:pass)';
        $stmt = $pdo->prepare($q);
        $r = $stmt->execute(array(':email' => $email->getValue(), ':pass' => $password->getValue()));

        // Try to fetch the results:
        if ($r) {
            $stmt->setFetchMode(PDO::FETCH_CLASS, 'User');
            $user = $stmt->fetch();
        }
        
        // Store the user in the session and redirect:
        if ($user) {
    
            // Store in a session:
            $_SESSION['user'] = $user;
    
            // Redirect:
            header("Location:index.php");
            exit;
    
        }
        
    } // End of form validation IF.
    
} // End of form submission IF.

// Show the login page:
$pageTitle = 'Login';
include('includes/header.inc.php');
include('views/login.html');
include('includes/footer.inc.php');
?>

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Too many files (pear, htmlquickform_2). 5 lines in the call stack. Is this above my skill level?
too many files. Is this above my skill level
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Question by:rgb192
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Expert Comment

by:Ray Paseur
ID: 39969162
Zandstra is pretty advanced.  Plan on spending a considerable amount of time.

I don't think this is above your skill level as long as you can express in a natural language sentence what each line of code accomplishes.  If you can't do that, it's time to dig into the examples and documentation and clarify your understanding.

I also think you may want to ask a deep philosophical question about the if() statement.  Is there any circumstance in which I should omit the else{} clause?  The reason you want to think about this is because without the else{} clause you may find your programming doing something strange without any explanation.  Data-dependent problems, when the data enters the edge cases, are particularly troublesome when there is an if() without else{}.  If the only thing your else{} clause did for you was trigger_error() you would at least get a signal that something in your programming could not deal with an unexpected condition.

This is not a law or necessarily even a widely-held best practice.  It's just something to think about.
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Author Comment

by:rgb192
ID: 39973904
so is the purpose of object oriented programming to eliminate else statement?
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Expert Comment

by:Ray Paseur
ID: 39974838
The purpose(s) of object oriented programming go a bit further.  I was talking about the code snippet posted with this question.
http://www.experts-exchange.com/viewCodeSnippet.jsp?refID=28401769&rtid=10&icsi=1

Look at lines 29, 32, 40, 46.  Each of them is an if() statement that only executes a block of code if the expression evaluates TRUE.  But what should the code do if one or more of those expressions evaluates FALSE?  Since there is no else{} clause associated with the if() statements, there is no useful alternative, not even a warning in the error_log.  That kind of programming is going to suffer a data-dependent failure some day, and whoever is dealing with it will be left scratching and wondering what went wrong.
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Author Comment

by:rgb192
ID: 39980091
That is alot of if statements from Larry Ulman.

so after 3 chapters of php introduction
there are 5 chapters of oop

and then chapter 9 is content management system which needs to be mostly procedural programming

but I think the code sample from chapter 9 is not really what I learned in the 5 oop chapters


I think all books towards the end produce projects which are practical and not philosophical.
But I rather learn oop.
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Accepted Solution

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Ray Paseur earned 500 total points
ID: 39980348
Most PHP programming is a mix of procedural and object-oriented.  Even some of the best-written frameworks have procedural parts.  I believe the Facebook variant of PHP called Hack comes closer to a "real" OOP language.  You just have to use your judgement about these things.
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Author Closing Comment

by:rgb192
ID: 39980801
thanks for guidance and hack example
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