Category Archives: Web Development - Page 4

Make a div stick to top when scrolled to

There are times when you would want to display a bar at the top of the page when user scrolls on the page and it should go back to its original position when the user scrolls back up. This is particularly useful when you want to add say a share bar, a search bar, etc and make it always visible even when the user is at the bottom of the page.
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Migrating servers using DNS TTL for minimum downtime

You have your site running on an old hardware and want to migrate it to a new upgraded hardware which would result in change of the ipaddress of your site and in turn imply downtime for your site. You want to minimize the downtime due to the change in ipaddress. This can be easily achieved using the Time-to-live (TTL) values of the Domain Naming Service (DNS) entries of your website.

The users usually use your site name and not the ipaddress to visit to your site. DNS is used to resolve the site name to the correct ipaddress. The DNS entry is stored at various levels (browser, OS, proxy server, DNS servers, etc) and is cached for a specific period called as Time-to-live (TTL). Once the TTL expires, the DNS record will be fetched again from the DNS Server. Usually the TTL for a DNS entry is specified as 3600 sec (i.e. 1 hr). The TTL values can be even lower (0, i.e. no caching) or higher (up to 68 years).

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404 Error Page Best Practices

A 404 error page is the page that the user may reach due to various reasons. Some of the reasons are:

  • The user has entered / spelt the URL incorrectly.
  • The page has been moved or deleted.
  • The URL they clicked on was incomplete or cut in an email or message.

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How and when to use robots.txt file

We have heard of crawlers and bots are crawling our sites to scrap content for various reasons like indexing in search engines, identifying content, scanning email addresses, etc. There are all kinds of crawlers/bots which crawl websites. While some are good which should be allowed access to our site, but we might want to restrict some. In this post we will see how we can do this.

Topics Covered:

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Getting real client IP address in PHP

Many times we need the visitor’s ipaddress for validation, security, spam prevention, etc. Getting the Visitor’s ipaddress is very easy in PHP.

The simplest way to get the visitor’s/client’s ipaddress is using the $_SERVER['REMOTE_ADDR'] or $_SERVER['REMOTE_HOST'] variables. The variable in the $_SERVER array are created by the web server (like apache) and we can use them in PHP.

// Get the client ip address
$ipaddress = $_SERVER['REMOTE_ADDR']

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