To check if a URL or an email address is valid, the common solution is regular expressions. For instance, to validate an email address in PHP, I would use: if (preg_match(‘|^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$|i’, $email)) { // $email is valid } A simpler and more forgiving one would be: |^\S+@\S+\.\S+$| Which is usually quite enough for signup forms …
It may seem simple at first because most of us should be relying on the server side environmental variable REMOTE_ADDR solely for client IP addresses: echo $_SERVER[‘REMOTE_ADDR’]; Yet it’s barely enough to get the real IP for a variety of circumstances such as when the user is visiting your website from a proxy server. To …
PHP: How to detect / get the real client IP address of website visitors? Read More »
The simplest way to define a CSS rule in jQuery might be: $(".sth").css("color", "#f00"); To define more than one CSS rule in a single jQuery line: $(".sth").css("color", "#f00").css("font-style", "italic").css("text-decoration", "underline"); Which simply doesn’t look that good, especially if you intend to add more. A better way to specify multiple CSS rules or properties with jQuery …
How to define multiple CSS rules / properties in jQuery? Read More »
With a Quantcast world traffic rank of less than 1000, Stack Overflow has become the most visited website for developers and software engineers. It doesn’t require a genius to figure out that the site is raking in tremendous advertisement revenues while the full potential of its monetizing capacity hasn’t been unleashed yet because the creators …
If you were like me who accidentally closed the browser window of his PayPal account AND immediately tried to reopen it by typing in www.paypal.com in the browser address bar, chances are your PayPal account is instantly limited. It was really weird at first but soon it makes sense. This is to prevent session hijacking …
PayPal Account Access Limitation after Closing Browser Window and Opening It Again Read More »
A quick post to share with my readers some interesting findings regarding email marketing. Outlined by the ninth bi-annual Email Marketing Metrics Report by MailerMailer, these data is based on 300,000 email messages dispatched over a period of 6 months that ended on December 31, 2008. Here are some key statistic discoveries from the report …
Email Marketing Statistics and Optimization of Open / Click Rates Read More »
While you can always use .htaccess and the mod_rewrite module to map SEO friendly URLs to actual PHP parameterized URLs with question marks and ampersands, you can simply put these lines in .htaccess and then rely on PHP entirely to recognize and handle all incoming URL requests of any kind / form: <IfModule mod_rewrite.c> RewriteEngine …
Use PHP to handle all incoming URL requests in a SEO friendly manner Read More »
PHP file upload max size is determined by 3 configuration values in php.ini, namely upload_max_filesize, post_max_size and memory_limit. You can get the maximum file size allowed in uploading by this snippet: $max_upload = (int)(ini_get(‘upload_max_filesize’)); $max_post = (int)(ini_get(‘post_max_size’)); $memory_limit = (int)(ini_get(‘memory_limit’)); $upload_mb = min($max_upload, $max_post, $memory_limit); Wherein $upload_mb is the maximum file size allowed for upload …
PHP: Get the File Uploading Limit – Max File Size Allowed to Upload Read More »
I guess most of the websites out there are using plain strings for the years of footer copyright because many of them are still showing 2009 right now. If you have quite a few websites as I do, it’d be kind of intimidating to manually update the copyright years for all of them. So why …
PHP: Display Current Year to Automatically Update Copyright Years Read More »
PHP has a stat() function that returns an array containing the meta information of a file such as owner, size, time of last access, last modification or last change. It’s basically the stat command under Linux that returns and shows the file system meta information of any file or directory: stat myfile.txt Which returns: File: …
Googlebot is the indexing program of Google that visits your site to fetch the content to determine your search engine rankings. With a popular website, tens of thousands of pages can be a problem in that Googlebot may visit more than you want because it’s expending your precious bandwidth and even crashing your server. Every …
How to slow down the frequency Googlebot (search engine crawler) visits your site? Read More »
Textarea and text input are common html form controls that accept text input. They can be a security challenge as they allow the user to enter anything they want. If you just go about using whatever data the user has entered, your application is anything but secure. Some sort of filtering / white-listing must be …
Update: Here’s the latest coupon code of Godaddy – $1.49 / year .com A quick deal for my readers. Found this coupon code of GoDaddy that enables you to renew .com domains at just $7.49: Zine10 Just used it to renew tens of my .com names at $7.49 (plus ICANN fee $0.18) each. If you …
I’d like to share with you some tips about hardening the database part of your application. Here are a few things you can do in protecting the databases from being compromised in security: Create separate users with ONLY necessary privileges (as few as possible) to connect to the database for common daily tasks. Never use …
A few database security tips – things to do to effectively protect MySQL databases Read More »
When you need to include or require a php file that is in the same directory as the currently running one, most people come up with this simple line in the current script: include(‘include.php’); While this approach doesn’t present obvious breaches, it is slightly inefficient than the following way: include(dirname(__FILE__).’/include.php’); You will type a little …
PHP: Why you should use dirname(__FILE__).‘/include.php’ instead of just ‘include.php’ Read More »
That is, to host all static content such as ready-made images, scripts, style sheets on a different domain rather than the primary one that hosts the page of the current URL. For example, if you intend to add static images to the web page located at http://www.example.com/page.html, you should not place the images on www.example.com, …
2 reasons you should host all static content on a different domain Read More »
