1. isset()

This function is mostly used to test incoming variables such as form input variables. It returns true only is the variable is not null.

2. empty()

empty() returns true if the variable is not empty, meaning not one of the following: “”, “0″,0,false,array(),null.

3. is_null()

is_null() returns true if the variable is null. is_null() is the opposite of isset()

Function Comparision

The solution can be found on HP’s official website

• opendir(String $path)
  Opens up a directory handle for file/directory manipulation

• getcwd(void)
  Returns the current working directory.

• readdir(resource $dir_handle)
  Returns the filename of the next file in the directory.

• rewinddir ([ resource $dir_handle ] )
  Returns the directory stream to the beginning of the directory.

• closedir([resource $dir_handle ])
  Closes the directory.

Example(Indexing the directory):

<?php
$cur_dir = '/usr/download';
/** opens the directory handle */
$dir = opendir($cur_dir);
echo 'File Listing For : ';
echo getcwd() . '<br /><ul>';
/** goes through each files and output the filename */
while(($file = readdir($dir)) !== false){
        /** do not output . and .. */
        if($file != '.' && $file != '..'){
                echo '<li>' . $file . '</li>';
        }
}
echo '</ul>';
/** closes the directory handle */
closedir($dir);
?>

A more object oriented approach

<?php
$cur_dir = '/usr/download';
$dir = dir($cur_dir);
echo 'File Listing For : ';
echo $cur_dir . '<br /><ul>';
/** goes through each files and output the filename */
while(($file = $dir->read()) !== false){
        /** do not output . and .. */
        if($file != '.' && $file != '..'){
                echo '<li>' . $file . '</li>';
        }
}
echo '</ul>';
/** closes the directory handle */
$dir->close();
?>

Pingdom Provides several useful tools, including Fall Page Test, DNS Health, Ping And Traceroute. The Fall Page Test creates a chart of the size and the loading time for every single element in the URL that you want to test. It’s very straight forward and it helps you to spot the bottleneck. It helps me to reduce the load time of my blog from originally 10+ seconds to now only 4 seconds. If your blog is experiencing long loading time, you got to try this, as it may help you to throttle up your blog.



Pingdom

Enter the URL to run the test

Chart shows the size and loading time of all elements in the page, very straight forward and helpful.


Test Result / Benchmark

With USB support, Puppy is now even more portable. It can be used virtually everywhere on every computer.

I have Puppy Linux on a liveCD, but I am still waiting for my new USB drive which I purchase on NewEgg.com to arrive so that I can load it with Puppy Linux.

PS：Quick fix.

Quick fix 1：
Hold your iPhone the right way。

Quick fix 2：
Purchase the phone cover for your iPhone 4

Quick fix 3：
Use duct tape to seal the antenna gap。

All templates need some slight modification so that the structure and the div of the templates would align with the current theme.

<!-- Here is part of the original template -->

<div id="content" class="now-reading primary narrowcolumn">
        <div class="post-content clearfix">
               .............
               .............
        </div>
</div>

What we need to do is just wrap the who div with the div container of your theme. Different themes may use different div wrapper class. So modify these templates accordingly. You may want to consult the page.php file in the directory of your current theme. Open the template in the plugin folder, Now Reading Reloaded/templates/, then only modify certain code, leave the header and footer alone.

<!-- main content: primary + sidebar(s) -->
<div id="main">
    <div id="main-inside" class="clearfix">

        <!-- primary content -->
        <div id="primary-content">

            <div id="content" class="now-reading primary narrowcolumn">
                <div class="post-content clearfix">
                    .............
                    .............
                </div>
            </div>

        </div>
	<!-- /primary content -->

        <!-- side bar -->
        <?php get_sidebar(); ?>
        <!-- /side bar -->

    </div>
    <!-- /main content -->

</div>

Result: