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Working with Session in PHP

admin — Tue, 03 Aug 2010 10:15:38 +0000

Session is the one of the most important factor in any web programming. Basically we know that session holds the value in a specific time period when session is expired we have lost the value. Mostly on that time we use session when ever we are trying to create a login form. We describe few example related to session it will help full to when ever you try to use a session.

url rewriting for seo friendly URL, Convert .php to .html

admin — Mon, 26 Jul 2010 12:13:19 +0000

For rewriting the URL, you should create a .htaccess file in the root folder of your web directory. And have to put the following codes as your requirement.

Options +FollowSymlinks
RewriteEngine on
RewriteRule ^(.*)\.htm$ $1.php [nc]

The following example will rewrite the test.php to test.html i.e when a URL like http://localhost/test.htm is called in address bar it calls the file test.php. As you can see the regular expression in first part of the RewriteRule command and $1 represents the first regular expression of the part of the RewriteRule and [nc] means not case sensitive.

Options +FollowSymlinks
RewriteEngine on
RewriteRule ^item-([0-9]+)\.html$ item.php?id=$1

The following example will rewrite the item.php?id=5 to item-5.html i.e when a URL like http://localhost/product-5.html calls item.php?id=5 automatically.

Get the width and height of an image using a function in PHP

admin — Tue, 02 Mar 2010 10:22:13 +0000

Syntax

list($width, $height, $type, $attr) = getimagesize(“image_name.jpg“);

< ? php

list($width, $height, $type, $attr) = getimagesize("image_name.jpg");

echo "Image width " .$width;
echo "
";
echo "Image height " .$height;
echo "
";
echo "Image type " .$type;
echo "
";
echo "Attribute " .$attr;

? >

—————————————————————————————————————–

When you run this script you will see the result like this

Image width 379
Image height 344
Image type 2
Image attribute width=”379″ height=”344″

You will get the width, height, type of an image and also attribute of an image, I use this function in my image upload form.
Type of an image you can see from table below

Type of the image

1 = GIF	5 = PSD	9 = JPC	13 = SWC
2 = JPG	6 = BMP	10 = JP2	14 = IFF
3 = PNG	7 = TIFF(intel byte order)	11 = JPX	15 = WBMP
4 = SWF	8 = TIFF(motorola byte order)	12 = JB2	16 = XBM

Redirecting non-www to www with .htaccess

admin — Sat, 27 Feb 2010 09:49:24 +0000

If you would like to redirect all non-www requests to your site to the www version, you need to add the following code to your .htaccess file:

in your .htaccess file

RewriteEngine On

RewriteCond %{HTTP_HOST} !^www\.

RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

This will redirect any requests to http://your-domain.com to http://www.your-domain.com. There are some benefits from doing that:

It will avoid duplicate content in Google
It will avoid the possibility of split page rank and/or split link popularity (inbound links).
It’s nicer, and more consistent.

Note that if your site has already been indexed by Google without the www, this might cause unwanted side effects, like lost of PR. I don’t think this would happen, or in any case it would be a temporary issue (we are doing a permanent redirect, 301, so Google should transfer all rankings to the www version). But anyway, use at your own risk!

Something nice about the code above is that you can use it for any website, since it doesn’t include the actual domain name.

Redirecting www to non-www

If you want to do the opposite, the code is very similar:

in your .htaccess file

RewriteEngine OnRewriteCond %{HTTP_HOST} !^my-domain\.com$ [NC]RewriteRule ^(.*)$ http://my-domain.com/$1 [R=301,L]

In this case we are explicitly typing the domain name. I’m sure it’s possible to do it in a generic way, but I haven’t had the time to work one out and test it. So remember to change ‘my-domain’ with your domain name!