PHP Dependancy Injection

This two scripts show Motor class as dependency that is injected in Car class.

<?php
class Motor {
    public function startEngine(){
        echo 'engine has started';
    }
}

class Car {
    public function __construct(Motor $m){
        $m -> startEngine();
    }
}

$a = new Car(new Motor());
?>

and second example

<?php
class Motor {
    public function __construct(){
        echo 'engine has started';
    }
}

class Car {
    public function __construct(){
        $m = new Motor();
    }
}

$a = new Car();
?>

The point is that instancing of dependent class is not done in client but in consumer class. 

Expand Partition, Split VMDK to Multiple Files on VirtualBox

Expand Partition

C:\Windows\system32>cd C:/Program Files/Oracle

C:\Program Files\Oracle>cd VirtualBox

C:\Program Files\Oracle\VirtualBox>VBoxManage modifyhd "c:\Users\user_name\VirtualBox VMs\Windows7\Windows7-disk1.vmdk" --resize 20000
0%...
Progress state: VBOX_E_NOT_SUPPORTED
VBoxManage.exe: error: Resize hard disk operation for this format is not impleme
nted yet!

C:\Program Files\Oracle\VirtualBox>VBoxManage clonehd "c:\Users\user_name\VirtualBox VMs\Windows7\Windows7-disk1.vmdk" "c:\Users\user_name\VirtualBox VMs\Windows7\Windows7-disk1.vdi" --format VDI --variant standard
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Clone hard disk created in format 'VDI'. UUID: fa9fd259-fe7b-4a84-90c2-e7e0a516c
5ad

C:\Program Files\Oracle\VirtualBox>VBoxManage modifyhd "c:\Users\user_name\VirtualBox VMs\Windows7\Windows7-disk1.vdi" --resize 20000
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

C:\Program Files\Oracle\VirtualBox>


Now you can expand partition in gparted. Right click on partition -> resize

Split VMDK Volume to multiple parts

C:\Program Files\Oracle\VirtualBox>VBoxManage.exe 
clonehd "c:\Users\UserName\VirtualBox VMs\Ubuntu\Ubuntu-disk1.vmdk" 
"c:\Users\UserName\VirtualBox VMs\Ubuntu\Ubuntu-frags.vmdk" 
--format VMDK 
--variant Split2G
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Clone medium created in format 'VMDK'. UUID: bc391000

PDO - Full Snippet

This is fully working snippet for PDO Select with parameters

<?php
$username = "user_name";
$password = "password";
$hostname = "localhost";
$dataBase = "data_base_name";
$character_set = "utf8";
$id = 8;
$slug = "string";
try {
 $conn = new PDO("mysql:host=$hostname;dbname=$dataBase;charset=$character_set", $username, $password);
 $conn -> setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 $stmt = $conn -> prepare("SELECT * FROM table_name WHERE id = :id AND slug=:slug");
 $stmt->bindParam(":id", $id, PDO::PARAM_INT);
 $stmt->bindParam(":slug", $slug, PDO::PARAM_STR); 
 $stmt->execute();
 echo "Query has: ".$stmt -> rowCount() . " rows <hr>";
 while ($row = $stmt -> fetch()) {
  echo $row['id'] . " - " . $row['slug'] . "\n<br>";
 }
} catch(PDOException $e) {
 echo 'ERROR: ' . $e -> getMessage();
}
?>

Change WordPress Language in Theme

If using _e("Hello","textdomain"); to translate theme you need to create an es_es.po file in text editor:

msgid ""
msgstr ""
"Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n"
"%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);\n"
"Project-Id-Version: Theme Name\n"
"POT-Creation-Date: \n"
"PO-Revision-Date: \n"
"Last-Translator: Mike <w@w.com>\n"
"Language-Team: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Language: es_ES\n"
"X-Generator: Poedit 1.6.9\n"
"X-Poedit-SourceCharset: UTF-8\n"

#: ../header.php:58
msgid "Hello"
msgstr "Hola"

Compile it with POEeditor you will get file es_es.mo. Upload both files

/wp-content/themes/{yourTheme}/languages

in functions.php add

add_action('after_setup_theme', 'my_theme_setup');
function my_theme_setup(){
    load_theme_textdomain('textdomain', get_template_directory() . '/languages');
}

In WP backend change language to Spanish. And both your theme and WP backend will be in Spanish. You can use plugin to leave backend in English.

WordPress Pagination and Search in Backend

This an advanced WordPress tutorial about plugin that creates and searches a table in database. All that is happening in WordPress backend. This is useful when you need to see what your visitor have submitted to you in contact form.

After plugin activation populate table tablePrefix_messages with some

jQuery Advanced Event Handling

Event handler remove, attach and event stop propagation.

<!DOCTYPE html>
<html lang="en">
 <head>
  <meta charset="utf-8">
  <title>Working with events</title>
  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
  <script>
   $(document).ready(function() {
    var myHandleFunc = function(e) {
     alert('Before `stopPropagation()`');
     e.stopPropagation();
     alert('After `stopPropagation()`');     
    };
    
    $('p').click(myHandleFunc);
  
    $('div.chapter').click(function() {
     alert('I\'m not executed unless you click on yellow or remove event handler for p element');
    });
    
    $('#remove').click(function() {
     $('p').off('click');
    });  
    
    $('#attach').click(function() {
     $('p').on('click', myHandleFunc);
    });              
   });
  </script>
 </head>
 <body>
  <div id="container">
   <div>
    <h2>Click on paragraph <button id="remove">Remove event</button> <button id="attach">Attach event</button></h2>
   </div>
   <div style="padding: 50px;background: yellow;"  class="chapter">
    <p style="background: white;">
     Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
    </p>
   </div>
  </div>
 </body>
</html>

Typical SVN Operations on Command Line

1) Checkout
2) Add SVN Ignore property
3) Create branch based on trunk
4) Switch to new branch
5) Merge dry run
6) Real megring

1) svn checkout https://xp-dev.com/svn/donald456/trunk -r HEAD --depth=infinity --force

2) svn propset svn:ignore "index.php" C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk

3) svn copy -rHEAD https://xp-dev.com/svn/donald456/trunk https://xp-dev.com/svn/donald456/branches/grana001

4) svn switch https://xp-dev.com/svn/donald456/branches/grana001 C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk -r HEAD --force


5) svn merge --dry-run --depth=infinity https://xp-dev.com/svn/donald456/trunk@HEAD \ 
                                        https://xp-dev.com/svn/donald456/branches/grana002@HEAD \
                                        C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk \
    --- Merging differences between repository URLs into C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk
     U C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk
    Dry-run merge complete.
    ==== Property Statistics: =====
    Updated: 1

6) svn merge --depth=infinity https://xp-dev.com/svn/donald456/trunk@HEAD \
                              https://xp-dev.com/svn/donald456/branches/grana002@HEAD \ 
                              C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk
    --- Merging differences between repository URLs into C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk
     U C:/Users/yourUserName/Documents/Aptana Studio 3 Workspace/donaldtrunk
    Merge complete.
    ==== Property Statistics: =====
    Updated: 1