    parent::fooBar();

Straight from the [manual][1]:

&gt; The ... double colon, is a token that allows access to ... overridden properties or methods of a class.
&gt;
&gt; ...
&gt;
&gt; ### Example #3 Calling a parent&#39;s method
&gt;
    &lt;?php
    class MyClass
    {
        protected function myFunc() {
            echo &quot;MyClass::myFunc()\n&quot;;
        }
    }
&gt;    
    class OtherClass extends MyClass
    {
        // Override parent&#39;s definition
        public function myFunc()
        {
            // But still call the parent function
            parent::myFunc();
            echo &quot;OtherClass::myFunc()\n&quot;;
        }
    }
&gt;    
    $class = new OtherClass();
    $class-&gt;myFunc();
    ?&gt;


  [1]: http://www.php.net/manual/en/language.oop5.paamayim-nekudotayim.php

Just a quick note because this doesn&#39;t come up as easy on Google searches, and this is well documented in php docs [if you can find it][1]. If you have a subclass that needs to call the superclass&#39;s constructor, you can call it with:

    parent::__construct(); // since PHP5

An example would be if the super class has some arguments in it&#39;s constructor and it&#39;s implementing classes needs to call that:

    class Foo {
    
      public function __construct($lol, $cat) {
        // Do stuff specific for Foo
      }
    
    }

    class Bar extends Foo {

      public function __construct()(
        parent::__construct(&quot;lol&quot;, &quot;cat&quot;);
        // Do stuff specific for Bar
      }

    }

You can find a more motivating example [here][2].


  [1]: http://php.net/manual/en/language.oop5.decon.php
  [2]: https://web.archive.org/web/20150318062403/http://www.tuxradar.com/practicalphp/6/10/1

I have a drop down list and would like to remove an option from it, given the text/value of that particular option. Is it possible using jQuery? Just like &#39;append&#39; which adds an option to the drop down list, is there a function to remove an option?

I tried searching for it but all I got were examples where the entire set of options in the drop down list are removed, which is not what I seek.

cheers

jQuery to remove an option from drop down list, given option&#39;s text/value

One of my model objects has a &#39;text&#39; column that contains the full HTML of a web page.  

I&#39;d like to write a controller action that simply returns this HTML directly from the controller rather than passing it through the .erb templates like the rest of the actions on the controller.

My first thought was to pull this action into a new controller and make a custom .erb template with an empty layout, and just `&lt;%= modelObject.htmlContent %&gt;` in the template - but I wondered if there were a better way to do this in Rails. 

How to return HTML directly from a Rails controller?

I have a `classB` which extends `classA`.

In both `classA` **and** `classB` I define the method `fooBar()`.
 
In `fooBar()` of `classB` I want to call `fooBar()` of `classA` at the beginning. 

Just the way I&#39;m used to, from Objective-C. Is that possible in PHP? And if so, how?

How to call super in PHP?

I have a <code>classB</code> which extends <code>classA</code>.
In both <code>classA</code> and <code>classB</code> I define the method <code>fooBar()</code>.
In <code>fooBar()</code> of <code>classB</code> I want to call <code>fooBar()</code> of <code>classA</code> at the beginning.
Just the way I'm used to, from Objective-C. Is that possible in PHP? And if so, how?

Example: I have a `$variable = &quot;_foo&quot;`, and I want to make absolutely sure that $variable does not start with an underscore `&quot;_&quot;`. How can I do that in PHP? Is there some access to the char array behind the string?

How to check if a string starts with &quot;_&quot; in PHP?

How do I change the order of my table fields without deleting the field and re-inserting it, using PHP myAdmin?

PHP myAdmin - Change Field Order (Move Up Or Down)

T_PAAMAYIM_NEKUDOTAYIM sounds really exotic, but most certainly absolutely nonsense to me. I traced it all down to this lines of code:

    &lt;?php
    Class Context {
        protected $config;
        
        public function getConfig($key) { // Here&#39;s the problem somewhere...
    	$cnf = $this-&gt;config;
    	return $cnf::getConfig($key);
        }
    
        function __construct() {
    	$this-&gt;config = new Config();
        }
    }
    ?&gt;

In the constructor I create a Config object. Here&#39;s the class:

    final class Config {
        private static $instance = NULL;
        private static $config;
    
        public static function getConfig($key) {
    	return self::$config[$key];
        }
    
        public static function getInstance() {
    	if (!self::$instance) {
    	    self::$instance = new Config();
    	}
    	return self::$instance;
        }
    
        private function __construct() {
    	// include configuration file
    	include __ROOT_INCLUDE_PATH . &#39;/sys/config/config.php&#39;; // defines a $config array
    	$this-&gt;config = $config;
        }
    }

No idea why this doesnt work / what the error means...

What does this mean? &quot;Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM&quot;

Example: I&#39;m checking for the existence of an array element like this:

    if (!self::$instances[$instanceKey]) {
        $instances[$instanceKey] = $theInstance;
    }

However, I keep getting this error:

&gt; Notice: Undefined index: test in /Applications/MAMP/htdocs/mysite/MyClass.php on line 16

Of course, the first time I want an instance, $instances will not know the key. I guess my check for available instance is wrong?



How can I check if an array element exists?

If a PHP script is run as a cron script, the includes often fail if relative paths are used. For example, if you have

    require_once(&#39;foo.php&#39;);
the file foo.php will be found when run on the command line, but not when run from a cron script.

A typical workaround for this is to first chdir to the working directory, or use absolute paths. I would like to know, however, what is different between cron and shell that causes this behavior. Why does it fail when using relative paths in a cron script?

Relative path not working in cron PHP script

I saw this in someone&#39;s code. What does it mean?

        def __enter__(self):
            return self
    
        def __exit__(self, type, value, tb):
            self.stream.close()


***

    from __future__ import with_statement#for python2.5 
    
    class a(object):
        def __enter__(self):
            print &#39;sss&#39;
            return &#39;sss111&#39;
        def __exit__(self ,type, value, traceback):
            print &#39;ok&#39;
            return False
    
    with a() as s:
        print s
        
        
    print s

Explaining Python&#39;s &#39;__enter__&#39; and &#39;__exit__&#39;

I&#39;m just getting into using prototypal JavaScript and I&#39;m having trouble figuring out how to preserve a `this` reference to the main object from inside a prototype function when the scope changes. Let me illustrate what I mean (I&#39;m using jQuery here):

    MyClass = function() {
      this.element = $(&#39;#element&#39;);
      this.myValue = &#39;something&#39;;
      
      // some more code
    }
    
    MyClass.prototype.myfunc = function() {
      // at this point, &quot;this&quot; refers to the instance of MyClass
      
      this.element.click(function() {
        // at this point, &quot;this&quot; refers to the DOM element
        // but what if I want to access the original &quot;this.myValue&quot;?
      });
    }
    
    new MyClass();

I know that I can preserve a reference to the main object by doing this at the beginning of `myfunc`:

    var myThis = this;

and then using `myThis.myValue` to access the main object&#39;s property. But what happens when I have a whole bunch of prototype functions on `MyClass`? Do I have to save the reference to `this` at the beginning of each one? Seems like there should be a cleaner way. And what about a situation like this:

    MyClass = function() {
      this.elements $(&#39;.elements&#39;);
      this.myValue = &#39;something&#39;;
      
      this.elements.each(this.doSomething);
    }
    
    MyClass.prototype.doSomething = function() {
      // operate on the element
    }
    
    new MyClass();

In that case, I can&#39;t create a reference to the main object with `var myThis = this;` because even the original value of `this` within the context of `doSomething` is a `jQuery` object and not a `MyClass` object.

It&#39;s been suggested to me to use a global variable to hold the reference to the original `this`, but that seems like a really bad idea to me. I don&#39;t want to pollute the global namespace and that seems like it would prevent me from instantiating two different `MyClass` objects without them interfering with each other.

Any suggestions? Is there a clean way to do what I&#39;m after? Or is my entire design pattern flawed?



Preserving a reference to &quot;this&quot; in JavaScript prototype functions

Why do we use Interface? 


Is it only for Standardization?


Why do we use Interface? Is it only for Standardization?

I am confused that what is the actual role of a delegate? 

I have been asked this question many times in my interviews, but I don&#39;t think that interviewers were satisfied with my answer.

Can anyone tell me the best definition, in one sentence, with a practical example?


What is Delegate?

Why should we make the constructor private in class? As we always need the constructor to be public.

Content Type	Original Author	Original Content on Stackoverflow
Question	openfrog	View Question on Stackoverflow
Solution 1 - Php	just somebody	View Answer on Stackoverflow
Solution 2 - Php	Spoike	View Answer on Stackoverflow

How to call super in PHP?

Php Problem Overview

Php Solutions

Solution 1 - Php

Solution 2 - Php

How to return HTML directly from a Rails controller?

jQuery to remove an option from drop down list, given option's text/value

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