<?php
interface Observer
{
 public function update(Observable $subject);
} 

interface Observable
{
 public function attachObserver(Observer $dependent);
 public function detachObserver(Observer $dependent);
 public function notify();
}

class Account implements Observable
{
 public $status;
 private $_observers = array();

 public function __construct()
 {
  $this->attachObserver(new Logger());
  $this->attachObserver(new Mailer());
 }

 public function attachObserver(Observer $object)
 {
  $this->_observers[] = $object;
 }

 public function detachObserver(Observer $object)
 {
  foreach ($this->_observers as $index => $observer) {
   if ($object == $observer) {
    unset($this->_observers[$index]);
   }
  }
 }

 public function notify()
 {
  foreach ($this->_observers as $observer) {
   $observer->update($this);
  }
 }

 public function save()
 {
  $this->notify($this);
  $this->notify();
 }
}

class Logger implements Observer
{
 public function update(Observable $subject)
 {
 //Update status in log table
 echo "Updating status in log table.\n";
 }
}

class Mailer implements Observer
{
 public function update(Observable $subject)
 {
 switch (get_class($subject)) {      
 case "Account":
 if ($subject->status == "Expired") {
 //send email: "account expired"
 echo "Sending account expired email.\n";
 }
 }
 }
}

$account = new Account();
$account->status = "Expired";
$account->save();

The interfaces aren’t strictly necessary, but they help make the whole thing clearer (I hope).

$this->notify($this);

The solution was to change line 10 in manager/includes/config.inc.php from this:

$database_connection_method = ‘SET CHARACTER SET’;

to this:

$database_connection_method = ‘SET NAMES’;

The difference between ‘SET CHARACTER SET’ and ‘SET NAMES’ is ‘SET NAMES’ tells mysql server what character set is going to be used in the connection between the server and the client (rather than just what charset will be used on the server and on the client themselves). Because it wasn’t being used, the mysql server was just guessing the character set, and guessing it wrong.

$modx->runSnippet(string $snippetName [, array $params]);

http://wiki.modxcms.com/index.php/API:runSnippet

You can hide fields, tabs and templates from the template dropdown for particular user roles. Handy for uncluttering your admin interface

1. comment out half the code
2. see if I still get the bug
3. if no then uncomment half the commented-out code and go to step 2
4. if yes then comment out half the un-commented-out code and go to step 2

It’s fairly rare I need to do this in php, but currently hacking in vbscript which I don’t know at all …

pear upgrade pear

and then

pear uninstall phpunit/PHPUnit

and then

pear install --alldeps phpunit/PHPUnit

Here’s how I extracted the images so that they weren’t displayed within the post but instead in another div separate from the post text:

$images = ""; $matches = array();
if (preg_match_all("/(<img[^>]*>)/iUs",$content,$matches)) {
    $images = implode(" ",$matches[1]);
    $content = preg_replace("/<img[^>]*>/iUs","",$content);
}
$content = "<div class=\"text\">$content</div>".
           "<div class=\"images\">$images</div>\n";

See what I did? I grabbed all the image tags out of $content with preg_match_all(), put them all into the variable $images, and then got rid of them all in $content using preg_replace(). Then I displayed $content and $images in separate divs.

You can use it on a page level too – on the index.php page of a theme, say, you can do an ob_start() to buffer the content, then ob_get_clean() it into a variable and manipulate the variable with regular expressions before echoing it out. So, for example, you could extract all the images or links (or whatever) from the content and display them somewhere else on the page.

It seemed to work fine on every phone in the office except my own – on mine (a basic nokia 2600) the image seemed to download, but just wouldn’t display (I was left with a correctly-sized blank instead). I could see the image was being generated and cached, and I could even save it on the phone, but when I tried to look at it it wouldn’t display.

Discovered it worked ok for gifs, and eventually I figured out the problem was jpeg image interlacing. The phone doesn’t seem to support it – turned it off and it works fine.

You can find a detailed explanation of the hasLayout property on http://www.satzansatz.de/cssd/onhavinglayout.html

<?php
class classWithTrigger
{
    private $varOne = 0;
    private $varTwo = 0;

    public function __set($varName,$varValue)
    {
        $this->$varName = $varValue;
        if ($varName == "varOne") {
            $this->varTwo = $this->varOne * 9;
        }
    }

    public function __get($varValue)
    {
        return $this->$varValue;
    }
}

$test = new classWithTrigger;

echo $test->varOne; // Outputs 0
echo $test->varTwo; // Outputs 0

$test->varOne = 1;

echo $test->varOne; // Outputs 1
echo $test->varTwo; // Outputs 9

The __get() method gets called whenever an attempt is made (from outside the class) to get the value of an undefined or inaccessible (private or protected) variable – in this case it just returns the value as it would if the variable was public. Similarly, the __set() method gets called whenever an attempt is made (from outside the class) to set the value of an undefined or inaccessible variable. As you can see, you can use the fact that this gets called to trigger something, whether it’s an update to another object variable like here, or a DB update, or anything else you can think of.