That is not HTML, but PHP. It is called the HEREDOC string method, and is an alternative to using quotes for writing multiline strings.

The HTML in your example will be:


        &lt;tr&gt;
          &lt;td&gt;TEST&lt;/td&gt;
        &lt;/tr&gt;

Read the [PHP documentation](http://php.net/manual/en/language.types.string.php) that explains it.

there are four types of strings available in php. They are single quotes (&#39;), double quotes (&quot;) and Nowdoc `(&lt;&lt;&lt;&#39;EOD&#39;)` and heredoc`(&lt;&lt;&lt;EOD)` strings

you can use both single quotes and double quotes inside heredoc string. Variables will be expanded just as double quotes.

nowdoc strings will not expand variables just like single quotes.

ref: http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc

How do you generate a Sudoku board with a unique solution? What I thought was to initialize a random board and then remove some numbers. But my question is how do I maintain the uniqueness of a solution?

How to generate Sudoku boards with unique solutions

How should I `typedef` a `template class` ? Something like:

    typedef std::vector myVector;  // &lt;--- compiler error
I know of 2 ways:

    (1) #define myVector std::vector // not so good
    (2) template&lt;typename T&gt;
        struct myVector { typedef std::vector&lt;T&gt; type; }; // verbose
Do we have anything better in C++0x ?


How to typedef a template class?

I am implementing node to PDF using Drupal and tcpdf. In such case I am suppose to use this `&lt;&lt;&lt;EOD` tag. If I don&#39;t use it, it throws error. I can&#39;t exactly get the purpose of `&lt;&lt;&lt;EOD`. 

Could anybody please explain the concept of this?


    $html = &lt;&lt;&lt;EOD
            &lt;tr&gt;
              &lt;td&gt;TEST&lt;/td&gt;
            &lt;/tr&gt;
    EOD;



What is the use of &lt;&lt;&lt;EOD in PHP?

I am implementing node to PDF using Drupal and tcpdf. In such case I am suppose to use this <code>&#x3C;&#x3C;&#x3C;EOD</code> tag. If I don't use it, it throws error. I can't exactly get the purpose of <code>&#x3C;&#x3C;&#x3C;EOD</code>.
Could anybody please explain the concept of this?
<pre><code class="hljs language-css">$html = &#x3C;&#x3C;&#x3C;EOD
 &#x3C;tr>
 &#x3C;td>TEST&#x3C;/td>
 &#x3C;/tr>
EOD;
</code></pre>

I have a method that return the current object, how do I document this?

    /**
     * set something
     *
     * @return this
     */
	public function setSomething(){
                // ...
		return $this;
	}

Or should I do `@return self` or `@return Current_Class_Name`?

---

Reason why this question is not &quot;primarily opinion-based&quot; (and should be reopened): conformance to standards and IDE type hinting support.

Should I use @return self, this or the current class?

I came across this code...

    if(isset($string[255])) {
        // too long
    }

isset() is between 6 and 40 faster than 

    if(strlen($string) &gt; 255) {
        // too long
    }

The only drawback to the isset() is that the code is unclear - we cannot tell right away what is being done (see pekka&#39;s answer). We can wrap isset() within a function i.e. strlt($string,255) but we then loose the speed benefits of isset().

**How can we use the faster isset() function while retaining readability of the code?** 

EDIT : test to show the speed http://codepad.org/ztYF0bE3

    strlen() over 1000000 iterations 7.5193998813629
    isset() over 1000000 iterations 0.29940009117126

EDIT2 : here&#39;s why isset() is faster

    $string = &#39;abcdefg&#39;;
    var_dump($string[2]);
    Output: string(1) “c”

    $string = &#39;abcdefg&#39;;
    if (isset($string[7])){
         echo $string[7].&#39; found!&#39;;
      }else{
         echo &#39;No character found at position 7!&#39;;
    }

This is faster than using strlen() because, “… calling a function is more expensive than using a language construct.” http://www.phpreferencebook.com/tips/use-isset-instead-of-strlen/

EDIT3 : I was always taught to be interested in mirco-optimisation. Probably because I was taught at a time when resources on computers were tiny. I&#39;m open to the idea that it may not be important, there are some good arguments against it in the answers.
I&#39;ve started a new question exploring this... https://stackoverflow.com/questions/6983208/is-micro-optimisation-important-when-coding

isset() vs strlen() - a fast/clear string length calculation

Im using PHP to build the URL of the current page. Sometimes, URLs in the form of 

    www.mydomian.com/myurl.html?unwantedthngs

are requested. I want to remove the `?` and everything that follows it (querystring), such that the resulting URL becomes:

    www.mydomain.com/myurl.html

My current code is this:

    &lt;?php
    function curPageURL() {
        $pageURL = &#39;http&#39;;
        if ($_SERVER[&quot;HTTPS&quot;] == &quot;on&quot;) {
            $pageURL .= &quot;s&quot;;
        }
        $pageURL .= &quot;://&quot;;
        if ($_SERVER[&quot;SERVER_PORT&quot;] != &quot;80&quot;) {
            $pageURL .= $_SERVER[&quot;SERVER_NAME&quot;] . &quot;:&quot; .
                $_SERVER[&quot;SERVER_PORT&quot;] . $_SERVER[&quot;REQUEST_URI&quot;];
        } else {
            $pageURL .= $_SERVER[&quot;SERVER_NAME&quot;] . $_SERVER[&quot;REQUEST_URI&quot;];
        }
        return $pageURL;
    }
    ?&gt;



How to remove the querystring and get only the url?

I&#39;m developing a simple php upload script, and users can upload only ZIP and RAR files.

What MIME types I should use to check `$_FILES[x][type]`? (a complete list please)

.rar, .zip files MIME Type

I need to search a multidimensional array for a specific value in any of the indexed subarrays.

In other words, I need to check a single column of the multidimensional array for a value.  If the value exists anywhere in the multidimensional array, I would like to return `true` otherwise `false`

    $my_array = array(    
        0 =&gt;  array(  
            &quot;name&quot;   =&gt; &quot;john&quot;,  
            &quot;id&quot;    =&gt;  4  
        ),  
        1   =&gt;  array(  
            &quot;name&quot; =&gt;  &quot;mark&quot;,  
            &quot;id&quot; =&gt; 152  
        ), 
        2   =&gt;  array(  
            &quot;name&quot; =&gt;  &quot;Eduard&quot;,  
            &quot;id&quot; =&gt; 152  
        )
    );

I would like to know the fastest and most efficient way to check if the array `$my_array` contains a value with the key &quot;id&quot;.  For example, if `id =&gt; 152` anywhere in the multidimensional array, I would like `true`.

Check if a specific value exists at a specific key in any subarray of a multidimensional array

Maybe I am not from this planet, but it would seem to me that the following should be a syntax error:

	int a[] = {1,2,}; //extra comma in the end

But it&#39;s not. I was surprised when this code compiled on Visual Studio, but I have learnt not to trust MSVC compiler as far as C++ rules are concerned, so I checked the standard and it ***is*** allowed by the standard as well. You can see 8.5.1 for the grammar rules if you don&#39;t believe me.

![enter image description here](//i.stack.imgur.com/kru1Y.png)

Why is this allowed? This may be a stupid useless question but I want you to understand why I am asking. If it were a sub-case of a general grammar rule, I would understand - they decided not to make the general grammar any more difficult just to disallow a redundant comma at the end of an initializer list. But no, the additional comma is ***explicitly*** allowed. For example, it isn&#39;t allowed to have a redundant comma in the end of a function-call argument list (when the function takes `...`), *which is normal*.

So, again, is there any particular reason this redundant comma is ***explicitly*** allowed?

int a[] = {1,2,}; Why is a trailing comma in an initializer-list allowed?

Looking through some old company code, I came across a for loop that looks like this:

    for (;;) {
        //Some stuff
    }

I tried Google but couldn&#39;t find any answers. Did I fall asleep in a programming class or is this an unusual loop?


How does a for loop work, specifically for(;;)?

In gherkin syntax (used by Cucumber and SpecFlow, I can comment out a line by prefixing it with &#39;#&#39;

Is there any way to block-comment multiple lines?

How to do block comments in Gherkin?

Sometimes I see methods in Ruby that have &quot;?&quot; and &quot;!&quot; at the end of them, e.g:

    name = &quot;sample_string&quot;
    name.reverse
    name.reverse!
    name.is_binary_data?

I was wondering what their purpose is? Are they just syntax sugarcoating?

What is the purpose of &quot;!&quot; and &quot;?&quot; at the end of method names?

This is valid and returns the string `&quot;10&quot;` in JavaScript ([more examples here][1]):

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    console.log(++[[]][+[]]+[+[]])

&lt;!-- end snippet --&gt;

Why? What is happening here?

  [1]: http://sla.ckers.org/forum/read.php?24,33349,33405


Content Type	Original Author	Original Content on Stackoverflow
Question	Fero	View Question on Stackoverflow
Solution 1 - Php	Pelle	View Answer on Stackoverflow
Solution 2 - Php	Poomalairaj	View Answer on Stackoverflow

What is the use of <<<EOD in PHP?

Php Problem Overview

Php Solutions

Solution 1 - Php

Solution 2 - Php

How to typedef a template class?

How to generate Sudoku boards with unique solutions

Attributions