Web Technology Experts Notes

How to load disqus when scroll to the bottom of the page?

Question: What is Disqus?
It is comment hosting service for web sites and online communities. It provide Services so that you can add comment system in your website.

Question: is Disqus multilingual?
Yes, It is.

Question: When Disqus was Launched?
October 2007

Question: Can we embed disqus in website?
Yes, you can embed.

Question: Does it provides channel for discussion?
Yes, It provides channel to discuss.

Question: What is offical website of Disqus?
http://disqus.com

Question: Can facebook user post comment using their fb account?
Yes, Facebook, twitter and google user can post comment using their account

Question: How to load disqus when scroll to the bottom of the page?

                        
  /*  CONFIGURATION VARIABLES  - MUST SET */
  var disqus_developer = 0;
  var disqus_shortname = 'aboutcity'; // required: replace example with your forum shortname                            
  var disqus_identifier = '/2015/07/ajax-technical-interview-questions-and-answers-for-experienced.html';
  var disqus_url = 'http://www.web-technology-experts-notes.in/2015/07/ajax-technical-interview-questions-and-answers-for-experienced.html';                    
  /*  CONFIGURATION VARIABLES  - MUST SET */
  
  var disqus_loaded = false;

  function load_disqus(){     
    disqus_loaded = true;
    var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
    dsq.src = "http://"+disqus_shortname+".disqus.com/embed.js";       
    (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);

  }

/** check now bottom of page **/
  window.onscroll = function(e) {
   if ((window.innerHeight + window.scrollY) >= document.body.offsetHeight) {
    //hit bottom of page
    if (disqus_loaded==false){ load_disqus() };
   }
  };

Advanced PHP Interview Questions and Answers

Question: What is PEAR in php?
PEAR means PHP Extension and Application Repository.
PEAR is a framework and distribution system for reusable PHP components. PEAR can be installed by bringing an automated wizard.
Following are main purpose of PEAR
A structured opensource library .
Distribution and package maintenance.
The PHP Foundation Classes (PFC)
The PHP Extension Community Library (PECL)

Question: How can we repair a MySQL table?
We can repair the MySQL with following 3 queries. Each have its own feature.

REPAIR TABLE tablename
REPAIR TABLE tablename QUICK
REPAIR TABLE tablename EXTENDED

Question: What Is a Persistent Cookie?
A persistent cookie is a cookie which is stored in a cookie file permanently on the browser.
A persistent cookie can be used for tracking long-term information.
Persistent cookies are less secure.

Question: How to create persistent cookie in php?
Cookies will only persistent for as long as you have set them.

setcookie( "cookieName", 'cookieValue', strtotime( '+1 year' ) ); //set for 1 year

Question: What is meant by urlencode and urldecode?
urlencode() returns the URL encoded version of the given string.
It convert special characters into % signs followed by two hex digits.

urldecode() returns the Decodes any %## encoding in the given string. Plus symbols ('+') are decoded to a space character.

Question: How To Get the Uploaded File Information in PHP Global variables?
We are all data in $_FILES variable and are following
$_FILES[$fieldName]['name'] - The Original file name on the browser system.
$_FILES[$fieldName]['type'] – The file type determined by the browser.
$_FILES[$fieldName]['size'] – The Number of bytes of the file content.
$_FILES[$fieldName]['tmp_name'] – The temporary filename of the file in which the uploaded file was stored on the server.
$_FILES[$fieldName]['error'] – The error code associated with this file upload.

Question: How can I execute a PHP script using command line?

php c:/wamp/www/myfile.php

Question: Are objects passed by value OR by reference?
Everything is passed by value.

Question: How do you call a constructor of a parent class from child class?
parent::constructor();

Question: Can we use include ("abc.php") two or more times?
Yes, we can include mutiple times.

Question: What is the difference between the functions unlink and unset?
unlink() deletes the given file from the file system.
unset() makes a variable undefined from memory

Question: What are the different functions in sorting an array?

Sort()
arsort()
asort()
ksort()
natsort()
natcasesort()
rsort()
usort()
array_multisort()
uksort().

Question: How can we get the browser properties using PHP?

$_SERVER['HTTP_USER_AGENT']

Question: How can I configure PHP to show error at runtime?

error_reporting(E_ALL)

Question: How do I turn off PHP Notices?
Add following code in top of php script.

error_reporting(0);

Question: What is T_PAAMAYIM_NEKUDOTAYIM?
T_PAAMAYIM_NEKUDOTAYIM the scope resolution operator (double colon)

::

Qustion: What is output of following program?

function doSomething( &$arg )
{
    $return = $arg;
    $arg += 1;
    return $return;
}

$a = 3;
$b = doSomething( $a );

echo $a;
echo '\n';
echo $b;

Question: How to protect your website from SQL injection attack?
use mysql_real_escape_string() function.

Question: How to protect your website from CSRF (Cross-Site Request Forgery) attack?
Add a token on every important request to secure important operations

Question: How to protech your website from XSS (Cross-Site Scripting) attack?
use php function htmlentities()

Question: what is the list of sensible functions?

exec(), passthru(), system(), popen(), eval(), preg_replace()

Question: What is output of following?

$a = 012;
echo $a / 4;

Web Technology Experts Notes

Sunday, 17 January 2016

How to load disqus when scroll to the bottom of the page?

Saturday, 16 January 2016

Advanced PHP Interview Questions and Answers

Sunday, 17 January 2016

How to load disqus when scroll to the bottom of the page?

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Saturday, 16 January 2016

Advanced PHP Interview Questions and Answers

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