31. Oktober 2015

Timber , TWIG & PoEdit

Timber / Twig templates are normally not recognized by Poedit. Its just a matter of tweaking the C/C++ extractor within the settings panel.

Add TWIG to the filetypes: *.c;*.cpp;*.h;*.hpp;*.cc;*.C;*.cxx;*.hxx;*.twig

Gettext calls, like {{__(“Points Conversion Rate”, “wplms-extras”)}} in Timber, are being extracted from your templates after that.

Easier than using the gettext extractor :)

ADDING GETTEXT FUNCTION TO TWIG

$function = new Twig_SimpleFunction('__', function ($args) {
 return __($args);
});
					
$twig->addFunction($function);

$function = new Twig_SimpleFunction('__', function ($args) {

return __($args);

});

$twig->addFunction($function);

Enjoy coding …

30. Oktober 2015

UTF-8 CSV files that Excel likes

Excel needs to know that you are using non-ASCII characters in your CSV or it will not display them correctly :)

Add the BOM(Byte Order Mark) to the first line, notifying Excel that you are offering a UTF-8 encoded file.

//headers
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Content-Description: File Transfer');
header('Content-Type: text/csv');
header('Content-Disposition: attachment; filename=your.csv;');
header('Content-Transfer-Encoding: binary'); 

//open file pointer to standard output
$fp = fopen('php://output', 'w');

//add BOM to fix UTF-8 in Excel
fputs($fp, $bom =( chr(0xEF) . chr(0xBB) . chr(0xBF) ));

//headers

header('Pragma: public');

header('Expires: 0');

header('Cache-Control: must-revalidate, post-check=0, pre-check=0');

header('Content-Description: File Transfer');

header('Content-Type: text/csv');

header('Content-Disposition: attachment; filename=your.csv;');

header('Content-Transfer-Encoding: binary');

//open file pointer to standard output

$fp = fopen('php://output', 'w');

//add BOM to fix UTF-8 in Excel

fputs($fp, $bom =( chr(0xEF) . chr(0xBB) . chr(0xBF) ));

Enjoy coding …

30. Oktober 2015

WPLMS + MyCred Points + Instructor Commission Points payout

I am currently working on a WPLMS enhancement for a customer, that allows to simplify the payout of instructor commissions. The whole system runs on the MyCred Points System and students pay for courses with Points. The problem is how to easily payout the instructor commissions via PayPal.

There is currently no addon for MyCred available that does that magic, so I build one myself.

At the moment the payment process via PayPal is completely manual, due to budget constraints. I am basically generating a custom “Send Money” link that prefills the PayPal email and amount to send.

The interface itself handles the payout sessions, tracks the instructor balance, paid and unpaid points.

Here some images to illustrate the admin dashboard:

This list the instructors and their point balance and allows to start the payment process.

Payout sessions make sure, that only one session can be started per instructor, as the instructor could earn new points during the process. The points converted can be changed, allowing you to payout a fixed amount of points.

Its a 3 step process. Login at PayPal. Open the “Send money” dialog and send money to instructor. Confirm that you manually send the money and than register the payment and payout points in the system.

The session can be cancelled at any point. You can also leave the session open and continue at a later point.

On the frontend I added an interface to the BuddyPress Profile, that allows the instructor to track his payouts and balance.

The whole setup could be updated using PayPal Adaptive Payments, to make the whole process completely automated. Something to consider for the future :) Pretty happy with the manual process so far and it will be a great help for my customer to keep track of the commission payouts.

The whole setup is currently targeted for WPLMS, but can easily be adapted to other setups using the MyCred Points System.

Enjoy coding …

20. Oktober 2015

WordPress Plugins & Sessions

START SESSION ON INIT

add_action('init', 'pluginStartSession', 1);
function pluginStartSession() {
    if(!session_id()) {
        session_start();
    }
}

add_action('init', 'pluginStartSession', 1);

function pluginStartSession() {

if(!session_id()) {

session_start();

}

NEW SESSION ON LOGIN / LOGOUT

add_action('wp_logout', 'pluginEndSession');
add_action('wp_login', 'pluginEndSession');

function pluginEndSession() {
    session_destroy ();
}

add_action('wp_logout', 'pluginEndSession');

add_action('wp_login', 'pluginEndSession');

function pluginEndSession() {

session_destroy ();

}

Now go ahead and use $_SESSION freely in your plugin. Here a nice additional class to encrypt session data.

Enjoy coding ….

20. Oktober 2015

HyperDB – replication, failover, load balancing, and partitioning for WordPress

HyperDB is a plugin for spreading your websites load across several servers and databases. Its currently used in production on WordPress.com.

Partitioning, separate your data and spread it across multiple servers.
Replication, master / slave setup for security.
Failover, if one database fails, the other takes over.

Just started experimenting with it :)

HyperDB

9. September 2015

PHP 5.6 + phpMailer + WordPress + Connection Errors

Since version 5.6+ PHP is verifying peer certificates and host names by default when using SSL/TLS. This is causing problems on some servers / websites, where the config has not been setup correctly. If you can not fix the setup yourself, make sure to talk to your server host to fix that issue.

For PHPMailer (Github) there is a workaround:

$mail->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
);

$mail->SMTPOptions = array(

'ssl' => array(

'verify_peer' => false,

'verify_peer_name' => false,

'allow_self_signed' => true

)

);

This should only be a workaround until your configuration has been fixed. You are suppressing certificate verification and compromising your security!

As WordPress is using PHPMailer as its main email library, this can be tweaked by using the phpmailer_init hook:

add_action( 'phpmailer_init', 'configure_smtp'  );

function configure_smtp( $phpmailer ){
 $phpmailer->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
 );
}

add_action( 'phpmailer_init', 'configure_smtp' );

function configure_smtp( $phpmailer ){

$phpmailer->SMTPOptions = array(

'ssl' => array(

'verify_peer' => false,

'verify_peer_name' => false,

'allow_self_signed' => true

)

);

}

Add this to your themes functions.php.

BASIC PHPMAILER SETUP

$phpmailer = new PHPMailer();
$phpmailer->isSMTP();
$phpmailer->CharSet = 'UTF-8';
$phpmailer->SMTPSecure = "ssl"; // or tls
$phpmailer->SMTPAuth = true; 
$phpmailer->Username = _APP_EMAIL_FROM;
$phpmailer->Password = _APP_EMAIL_PASS;
$phpmailer->XMailer =' ';
$phpmailer->Host= "correct email host";

$phpmailer = new PHPMailer();

$phpmailer->isSMTP();

$phpmailer->CharSet = 'UTF-8';

$phpmailer->SMTPSecure = "ssl"; // or tls

$phpmailer->SMTPAuth = true;

$phpmailer->Username = _APP_EMAIL_FROM;

$phpmailer->Password = _APP_EMAIL_PASS;

$phpmailer->XMailer =' ';

$phpmailer->Host= "correct email host";

And here is how phpmailer->smtpOptions should be used, on a properly configured server:

phpmailer->smtpOptions = array(
'ssl' => array(
          'peer_name'		  => 'your.domain.com',
          'verify_peer_name'    => true,
          'capath' 		     => '/path/to/authority/certificates/directory' # Usually /etc/ssl/certs or /usr/lib/ssl/certs/
          'local_cert' 		  => '/path/to/your.domain.com.crt', # Should be a combined cert & key in pem format
          'verify_peer'            => true,
    )
);

phpmailer->smtpOptions = array(

'ssl' => array(

'peer_name' => 'your.domain.com',

'verify_peer_name' => true,

'capath' => '/path/to/authority/certificates/directory' # Usually /etc/ssl/certs or /usr/lib/ssl/certs/

'local_cert' => '/path/to/your.domain.com.crt', # Should be a combined cert & key in pem format

'verify_peer' => true,

)

);

SSL changes in PHP 5.6: http://php.net/manual/en/migration56.openssl.php
SSL context options in PHP: http://php.net/manual/en/context.ssl.php

Enjoy coding…

3. September 2015

Fixing WordPress + Chrome 45+ admin menu glitch

Chrome 45+ is glitching on WordPress admin menus.

function chromefix_inline_css()
{ 
  if ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Chrome' ) !== false )
  {
    wp_add_inline_style( 'wp-admin', '#adminmenu { transform: translateZ(0); }' );
  }
}

add_action('admin_enqueue_scripts', 'chromefix_inline_css');

function chromefix_inline_css()

{

if ( strpos( $_SERVER['HTTP_USER_AGENT'], 'Chrome' ) !== false )

{

wp_add_inline_style( 'wp-admin', '#adminmenu { transform: translateZ(0); }' );

}

add_action('admin_enqueue_scripts', 'chromefix_inline_css');

Github Plugin version

22. Juni 2015

Twital – addon for the Twig template engine

Twital is a small addon for the Twig template engine, it adds shortcuts and makes Twig’s syntax more suitable for HTML based (XML, HTML5, XHTML, SGML) templates.

Should be also no problem to integrate it with Timber, currently looking into that ;)

<ul t:if="users">
    <li t:for="user in users">
        {{ user.name }}
    </li>
</ul>

// shorter than :

{% if users %}
    <ul>
        {% for user in users %}
            <li>
                {{ user.name }}
            </li>
        {% endfor %}
    </ul>
{% endif %}

</li>

</ul>

// shorter than :

{% if users %}

<ul>

{% for user in users %}

<li>

</li>

{% endfor %}

</ul>

{% endif %}

Twital

18. Juni 2015

Powerful database abstraction with Doctrine DBAL – Getting started

“Powerful database abstraction layer with many features for database schema introspection, schema management and PDO abstraction.”

The following will get you started, these offer the Doctrine\Common and Doctrine\DBAL namespaces.

BASIC SETUP

In the end your structure should look something like that:

includes/
includes/doctrine
includes/doctrine/lib
includes/doctrine/lib/Doctrine
includes/doctrine/lib/Doctrine/Common
includes/doctrine/lib/Doctrine/DBAL

The following will add a class loader, so that all the other classes will be autoloaded.

use Doctrine\Common\ClassLoader;

require dirname(__FILE__).'/includes/doctrine/lib/Doctrine/Common/ClassLoader.php';

$classLoader = new ClassLoader('Doctrine',dirname(__FILE__).'/includes/doctrine/lib');
$classLoader->register();

use Doctrine\Common\ClassLoader;

require dirname(__FILE__).'/includes/doctrine/lib/Doctrine/Common/ClassLoader.php';

$classLoader = new ClassLoader('Doctrine',dirname(__FILE__).'/includes/doctrine/lib');

$classLoader->register();

FIRST CONNECTION

This will setup your first connection to a MySQL database.

$config = new \Doctrine\DBAL\Configuration();

$connectionParams = array(
    'dbname' => 'my_db',
    'user' => 'my_user',
    'password' => 'my_pass',
    'host' => 'localhost',
    'driver' => 'pdo_mysql',
);
$conn = \Doctrine\DBAL\DriverManager::getConnection($connectionParams, $config);

$config = new \Doctrine\DBAL\Configuration();

$connectionParams = array(

'dbname' => 'my_db',

'user' => 'my_user',

'password' => 'my_pass',

'host' => 'localhost',

'driver' => 'pdo_mysql',

);

$conn = \Doctrine\DBAL\DriverManager::getConnection($connectionParams, $config);

FIRST QUERY

This will do a simple first query

$sql = "SELECT * FROM some_data";
$stmt = $conn->query($sql);

while ($row = $stmt->fetch()) {
    echo $row['some_field'];
}

$sql = "SELECT * FROM some_data";

$stmt = $conn->query($sql);

while ($row = $stmt->fetch()) {

echo $row['some_field'];

}

DYNAMIC & PREPARED

DBAL gives us some nice options to prepare queries.

$sql = "SELECT * FROM some_data WHERE id = ?";
$stmt = $conn->prepare($sql);
$stmt->bindValue(1, $id);
$stmt->execute();

$sql = "SELECT * FROM some_data WHERE id = ?";

$stmt = $conn->prepare($sql);

$stmt->bindValue(1, $id);

$stmt->execute();

By using the bindValue the placeholder “?” is replaced. You can also use named parameters :)

$sql = "SELECT * FROM some_data WHERE name = :name OR username = :name";
$stmt = $conn->prepare($sql);
$stmt->bindValue("name", $name);
$stmt->execute();

$sql = "SELECT * FROM some_data WHERE name = :name OR username = :name";

$stmt = $conn->prepare($sql);

$stmt->bindValue("name", $name);

$stmt->execute();

More about this in the official documentation.

That was not too difficult ;)

Enjoy coding …

18. Juni 2015

Regular Expression with TWIG / Timber to check for sticky post

TWIG allows you to use regular expressions within its templates, this makes it possible to easily check if a post is sticky in Timber for WordPress.

TWIG MATCHES OPERATOR

Comparisons in TWIG

{% if findme matches '/^[\\d\\.]+$/' %}
{% endif %}

1 2	{% if findme matches '/^[\\d\\.]+$/' %} {% endif %}

TIMBER TEASE-POST.TWIG

This is the template that is called within the loop on the index.twig to show each post.

{% extends "tease.twig" %}
{% block content %}
<div class="{% if post.class matches '/sticky/' %}col-md-12{% else %}col-md-6{% endif %}">
 <!--Your content -->
</div>
{% endblock %}

{% extends "tease.twig" %}

{% block content %}

</div>

{% endblock %}

The post.class holds the full set of classes assigned to a post, which includes the class “sticky”. We do the match magic and you can use that to style your sticky posts differently ;)

WHAT IS TIMBER?

“Timber helps you create fully-customized WordPress themes faster with more sustainable code. With Timber, you write your HTML using the Twig Template Engine separate from your PHP files.

This cleans-up your theme code so, for example, your php file can focus on being the data/logic, while your twig file can focus 100% on the HTML and display.”

WHAT IS TWIG?

Twig is a modern template engine for PHP

Fast: Twig compiles templates down to plain optimized PHP code. The overhead compared to regular PHP code was reduced to the very minimum.
Secure: Twig has a sandbox mode to evaluate untrusted template code. This allows Twig to be used as a template language for applications where users may modify the template design.
Flexible: Twig is powered by a flexible lexer and parser. This allows the developer to define its own custom tags and filters, and create its own DSL.