Web developers notes,programming tutorials.

According to a survey, here are the top reasons why visitors come back to your site:

1. Content (74%) - The main reason for a user to not visit your site again was most of the time “non-sense� or irrelivant content.

2. Enjoyability of the site (71%) - It was either something interesting in the layout or the interface that made them come back.

3. Organization of content (68%) - Users returned to sites that were well organized with a good layout & no text not all over the place.

4. Uniqueness of the site (66%) - Uniqueness is a big factor in sites, if it is something they’ve seen before, chances they won’t come back to your site.

5. Ease of access (64%) - The easier users can find content and information on your site, they more they returned to it.

6. Visually attractive (58%) - Good looking sites with effort put into the theme of the site had a reasonable amount of people come back.

7. Easy to navigate (54%) - This one is self-explaintory. Navigation should always be in a clear place, such as under the header or to the left side (mostly).

8. Website speed (53%) - Sure we all share this one, if a site is slow at loading, chances that we’ll never visit the site again because it’s “slow�.

Bitwise Operators

Bitwise operators allow you to turn specific bits within an integer

on or off. If both the left- and right-hand parameters are strings, the bitwise

operator will operate on the characters in this string.
Bitwise operators in PHP is similar to the bitwise operator in C &

C++.

Example:

echo 12 ^ 9; // Outputs ‘5′

echo “12″ ^ “9″; // Outputs the Backspace character (ascii
// (’1′ (ascii 49)) ^ (’9′ (ascii 57)) = #8

echo “hallo” ^ “hello”; // Outputs the ascii values #0 #4 #0 #0 #0
// ‘a’ ^ ‘e’ = #4

We can manage the amount of files in a particular directory using the following function. Every time a new file is uploaded the oldest one must be removed (using the unlink() function) if a maximum limit is already reached. The second parameter is optional and will set the limit whenever the check must happen or not.

<?php
function get_oldest_file($directory) {
if ($handle = opendir($directory)) {
while (false !== ($file = readdir($handle))) {
if (is_file($directory.$file)) { // add only files to the array (ver. 1.01)
$files[] = $file;
}
}
if (count($files) <= 12) {
return;
} else {
foreach ($files as $val) {
if (is_file($directory.$val)) {
$file_date[$val] = filemtime($directory.$val);
}
}
}
}
closedir($handle);
asort($file_date, SORT_NUMERIC);
reset($file_date);
$oldest = key($file_date);
return $oldest;
}
// this example will show you the oldest file if there are more then 10 in the dir
echo get_oldest_file(”/path/to/directory/”, 10);
?>