Show a default image if one doesn’t exist!!!

Do you want to show default image if the image url doesn’t exist? Using jQuery it can be done. Please try the following code..

var img = $('img');
var default_url = "http://example.org/images/img.jpg";
var img_url = "http://example.org/images/" + some_variable + ".jpg";
img.error(function() {
  $(this).attr('src', default_url) 
});
img.attr('src', img_url);

Installing PHP Mongo Driver on MAMP

To install latest Mongo driver on MAMP

1 - install autoconf using homebrew or Mac Ports

brew install autoconf

2 - Download php 5.4.10 source from php.net.

3 - rename uncompressed php source folder from php-5.4.10 to php and paste it in this folder

/Applications/MAMP/bin/php/php5.4.10/include/

4- using the terminal open php folder and run ./configure

cd /Applications/MAMP/bin/php/php5.4.10/include/php/ && ./configure

5 - Add MAMP bin to your ~/.bash_profile

echo "export PATH=/Applications/MAMP/bin/php/php5.4.10/bin:$PATH" >> ~/.bash_profile source ~/.bash_profile

6 - install latest mongo

pecl install mongo

7- restart MAMP server :).

8- Enable the extension Edit /Applications/MAMP/bin/php/php5.4.10/conf/php.ini Add the following line after the section named "; Extensions":

extension=mongo.so

Few tips on Wordpress and few Cheet Sheet

Improve Page Titles

If you want the page title to be the title of the post, edit header.php  file  and change the title tag as follows:

<title>

<?php if ( is_home() ) {  bloginfo('name'); echo(' — ');  bloginfo('description'); } else wp_title('',true); ?>

</title>

Improve Permalink Structure

If you want to have the page urls for each post as http://www.mysite.com/seo-title/

Follow

> Login
> Go to Options
> Then click on Permalinks
> Change the format to ‘Custom’ with the following format
/%postname%/
> Submit

You can also use post slugs to manually tweak the url. E.g. You might want to change:
http://www.mysite.com/long-and-very-long-title-might-not-good-looking/
http://www.mysite.com/short-one/

Date Problem solution for Post

When there are multiple posts on a page published under the SAME DAY, the_date() only displays the date for the first post (that is, the first instance of the_date()). To repeat the date for posts published under the same day, you should use the Template Tag the_time() or get_the_date() (since 3.0) with a date-specific format string.
Use <?php the_time( get_option( 'date_format' ) ); ?> to add the date set in the admin interface.

Wordpress : The Loop Visual Model

Bootstrap Pagination in CakePHP

<div class="pagination">
    <ul>
        <?php 
            echo $this->Paginator->prev( '<<', array( 'class' => '', 'tag' => 'li' ), null, array( 'class' => 'disabled myclass', 'tag' => 'li' ) );
            echo $this->Paginator->numbers( array( 'tag' => 'li', 'separator' => '', 'currentClass' => 'disabled pg_design' ) );
            echo $this->Paginator->next( '>>', array( 'class' => '', 'tag' => 'li' ), null, array( 'class' => 'disabled myclass', 'tag' => 'li' ) );
        ?>
    </ul>
</div>

CSS for which need to add

.pagination ul > li.pg_design {
    float: left;
    padding: 4px 12px;
    line-height: 20px;
    text-decoration: none;
    background-color: #ffffff;
    border: 1px solid #dddddd;
    border-left-width: 0;
    color: #999999;
    cursor: default;
    background-color: transparent;
}

.pagination ul > li.pg_design:first-child {
    border-left-width: 1px;
    -webkit-border-bottom-left-radius: 4px;
    border-bottom-left-radius: 4px;
    -webkit-border-top-left-radius: 4px;
    border-top-left-radius: 4px;
    -moz-border-radius-bottomleft: 4px;
    -moz-border-radius-topleft: 4px;
}

.pagination ul > li.pg_design:last-child {
    -webkit-border-top-right-radius: 4px;
    border-top-right-radius: 4px;
    -webkit-border-bottom-right-radius: 4px;
    border-bottom-right-radius: 4px;
    -moz-border-radius-topright: 4px;
    -moz-border-radius-bottomright: 4px;
}

Some Useful Linux command to get Linux System Information

If you are developing an application Linux Environment and would like to automatically find out more information about the system, use the following commands in shell scripts to get information about system.

Find out KDE Desktop version:

konqueror --version

Find out Gnome Desktop version:

gnome-panel --version

Find out disk space usage:

df -h

Find/Estimate file space usage:

du -h

Find out version of Linux glibc:

ls -l /lib/libc-*.so /lib/libc.so*

Find out user limits:

ulimit -a

Find out installed device drivers (modules)

lsmod

Find out information about Linux CPU

cat /proc/cpuinfo

Find out information about Linux Memory

cat /proc/meminfo

OR

free -m

OR

free -g

Find out user shell name:

ps -p $$ | tail -1 | awk '{ print $4 }'

Dump Linux kernel variables

/sbin/sysctl -a

Find out running Linux kernel version:

uname -mrs
uname -a
cat /proc/version

Dump or display memory information and swap information:

free -m

Network card and IP address information:

ifconfig -a
ifconfig -a|less

Debian / Ubuntu Linux network configuration file (all interface eth0,eth1,...ethN)

more /etc/network/interfaces

Redhat / CentOS / Fedora Linux network configuration file (eth0)

more  /etc/sysconfig/network-scripts/ifcfg-eth0

Note replace eth1 for 2nd network card and so on.

Display routing information

route -n
route

Display list of all open ports

netstat -tulpn

View login related logs

tail -f /var/log/secure
vi /var/log/secure
grep 'something' /var/log/secure

View mail server related logs

tail -f /var/log/maillog
vi /var/log/maillog
grep 'something' /var/log/maillog

Find how long the system has been running

uname
w

Show who is logged on and what they are doing

w
who

Display list of tasks

top

Display all running process

ps aux
ps aux | grep process-name

Display list of all installed software on Redhat / CentOS / Fedora

rpm -qa
rpm -qa | grep 'software-name'
rpm -qa | less

Display list of all installed software on Debian / Ubuntu

dpkg --list

EC2 Ubuntu Apache PHP MySQL Setup

1. In order to connect to the instance we need to assign an IP address. In the left menu in the EC2 Management Console select Elastic IPs under Network & Security. Allocate a new address and assign it to your instance. Elastic IPs are free as long as they are assigned to an instance, so remeber not to leave any unallocated IP addresses as you will get charged by the hour. Remember the assigned IP.
2. On your local machine use the pem key to SSH into your instance. On OS X change the permission of the key to 600 and use following command in terminal:

   ssh -i yourkeyname.pem ubuntu@yourelasticip

   and boom you are in.
3. Update the Ubuntu package manager and the installed packages:

   sudo apt-get update
   sudo apt-get dist-upgrade

4. Install Apache:

   sudo apt-get install apache2

5. Enable .htaccess files by editing the /etc/apache2/sites-available/default file, fx with vi or nano. Look for the /var/www directory and make sure it contains AllowOverride All.     <Directory /var/www/>
                   Options Indexes FollowSymLinks MultiViews
                   AllowOverride All
                   Order allow,deny
                   allow from all
   </Directory>
6. Enable the rewrite module in Apache:

   sudo a2enmod rewrite

7. Install PHP5:

   sudo apt-get install libapache2-mod-php5

8. Restart Apache:

   sudo /etc/init.d/apache2 restart

9. Ensure that Apache is running by typing the instance IP in your browser.
10. Allow the Ubuntu user to work with the /var/www folder:

    sudo adduser ubuntu www-data
    sudo chown -R www-data:www-data /var/www
    sudo chmod -R g+rw /var/www

    Logout and login again to pick up the new user group. Test by creating a directory and deleting it again in www without having to sudo. This will make your life easier since permissions will get messed up less once you start adding frameworks and tools to your web service.
11. Test PHP by cd into /var/www folder and typing sudo vi phptest.php. Hit i key to enter insert mode and just write a simple php script with a phpinfo() call.
    Hit ESC to exit insert mode and type :wq to save and quit the vi editor. Go to instanceIP/phptest.php in your browser and you should see the phpinfo displayed.
12. Install MySQL:

    sudo apt-get install mysql-server
    sudo apt-get install php5-mysql

    Insert root password for the database and remember it.
13. To test MySQL let’s install PHPMyAdmin:

    sudo apt-get install phpmyadmin

Next I think you need to install git.I don't prefer to use FTP client.

1. sudo apt-get install git

How to run Composer autoload and CodeIgniter autoload simultaneously

Did you tried to install composer and then you existing CodeIgniter Autoload stop working!!! It happened because __autoload is the old, deprecated way of doing autoloading and you can have only one.

How to run it?

You should register your autoloader using spl_autoload_register.

How you will do it in your code..Here is an example below...

function MY_CI_Autoload($class)
{
 if(strpos($class, 'CI_') !== 0)
 {
  @include_once( APPPATH . 'core/'. $class . EXT );
 }
}

spl_autoload_register('MY_CI_Autoload');

This way your autoloader and composer's will coexist happily.