B&T's Tips & Scripts

B&T's Tips & Scripts

This poll uses the voting script from this site

B&T's Tool Box
These tools use AJAX

Password Generation

Length of Password
Include Numbers
Include Uppercase Letters
Include Lowercase Letters
Include Special Characters

Password Encryption for .htpasswd

Username
Password

Hex RGB Color Conversion

Hex #
RGB

Check HTTP status code
enter full url to be checked

Domain Name / IP Resolution
enter Domain Name or IP Address

B&T's Recommendations

Apple Chronicles

Site5.com

Helpful Links to Other Sites

PHP Documentation
Apache Server Documentation
MySQL Reference Manual
W3C Page Validation Tools
View your site in other browsers
American Registry for IP Numbers
Test Your Firewall
Test Your Connection Speed

Feedback Form
No replies will be sent

captcha image missing

click the image to get new letters
enter the letters below

This form uses AJAX
and the Captcha script from this site

B&T's Tips & Scripts is a collection of Tips & Scripts to help you build a better website. The Tips & Scripts are targeted towards the native Apache PHP MySQL environment. Check back frequently as there will be additions and modifications. Please read our terms of use and our frequently asked questions.

Tag Definitions Language - if used
Date - most recent update

- for advanced users

- topic rating

Using .htaccess

.htaccess Basics Mar 9, 2006
Domain & subdomain pointing May 12, 2005
Automatic subdomains Jun 17, 2007
Undefined subdomains Jul 20, 2008
Prevent direct access to a pointer or subdomain directory Aug 15, 2006
Forcing or eliminating the WWW. Feb 9, 2005
Fixing the trailing slash problem May 11, 2005
Friendly URLs Mar 21, 2007
Rewrites and https Dec 18, 2007
Blocking traffic to your website Jan 2, 2005
Anti-leech May 25, 2005
Fancy default index page Jan 25, 2005

Using .htaccess/.htpasswd Password Protection

Setting up password protection Feb 9, 2005
Encrypt your password for .htpasswd PHP Dec 21, 2007
Auto Password Change and Email Notification PHP Dec 21, 2007
Auto generate .htpasswd file PHP Dec 18, 2007
Passing user authentication information to PHP PHP Jun 13, 2004

Coding Tips

HTML "One Liners" Nov 13, 2005
PHP "One Liners" PHPFeb 19, 2009
JavaScript "One Liners" JavaScript Aug 25, 2007
CSS examples Sep 9, 2006
SQL coding examples PHP Oct 1, 2011
MySQL Error Handling PHP Dec 20, 2007
AJAX example JavaScript PHP Aug 23, 2010
Regular Expression Rules Mar 22, 2006

Uploads and Downloads

File Upload Script PHP Oct 8, 2009
Custom Download Page PHP Oct 8, 2009
Tracking and Securing Downloads PHP Oct 29, 2011

Mail

Form Mail PHP August 27, 2010 see it on this page
Obfuscate your email address JavaScript Nov 12, 2006
Read and auto-process mail PHP Nov 12, 2004
Auto-responder PHP Dec 18, 2007
Display your email message count PHP Jul 30, 2004
Setting up SPF Records November 11, 2008
Specify a return-path for generated mail PHP Jul 18, 2006

Working with Images

Watermark images PHP Jul 14, 2007
Resize images (create thumbnails) PHP Jul 14, 2007

Frequently Requested Website Functionality

Visitor Counter PHP Dec 14, 2007 see it on this page
404 Error Page (with reporting and logging) PHP Dec 20, 2007
HTML5 Audio (flash fall-back) JavaScript Aug 19, 2011
CAPTCHA PHP Aug 27, 2010 see it on this page
Poll (voting) PHP Dec 17, 2007 see it on this page
Weather PHP Jul 27, 2008
FAQ Page JavaScript May 23, 2005 see it on this page
Time Until JavaScript Mar 01, 2010
Random/weighted banners (images), quotes & more PHP Feb 9, 2005
Multiple random banners (images) PHP Feb 20, 2009
Load a random image (simple) JavaScript Jan 20, 2004
Image (banner) rotation JavaScript Oct 15, 2007
Simple "members only" pages PHP May 13, 2005
Replace banned words PHP Apr 5, 2007
Get the most recent file date PHP Jan 30, 2006
Moving (bouncing) Image JavaScript Nov 10, 2005
Sticky default values for an input JavaScript Oct 22, 2006
Photo Album PHP JavaScript Mar 14, 2010
Make every image pop up JavaScript Apr 13, 2010

Using PHP

Creating a custom php.ini file PHP Dec 18, 2007
Copying the php.ini file PHP Dec 18, 2007
Deleting php.ini files PHP Dec 18, 2007
Clean up your PHP scripts PHP Nov 11, 2005

Website Managment

Tips for keeping your website secure Jan 24, 2006
Using Cron Sep 13, 2005
Website Monitoring PHP Jun 18, 2009
Automated Site Backups PHP Dec 19, 2007
Automated MySQL Backups PHP Dec 19, 2007
Find File and Directory Sizes PHP Dec 14, 2007
Deleting session files PHP Aug 9, 2006
Search and Replace PHP Dec 14, 2007

Other Tips

URL Validation PHP Aug 26, 2009
Stop direct links to web pages PHP Jan 22, 2004
Ensure your page is not opened in a frame JavaScript May 5, 2005
Masking your URL in the Address Bar JavaScript Jul 20, 2004
Ban or allow IP Addresses (without using .htaccess) PHP Aug 24, 2010
Using Cookies PHP Sep 24, 2006
View your website in different resolutions JavaScript Jan 2, 2005
Validate Webpages JavaScript Oct 1, 2009

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CAPTCHA

A CAPTCHA (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart", trademarked by Carnegie Mellon University) is a type of challenge-response test used in computing to determine whether or not the user is human.

This CAPTCHA script presents a distorted image with six letters. It is relatively easy for a human to see the letters and enter them into a response box on your input form. Then you send the response back to the script for verification.

In your html form, put an <img> tag for the image and an input box, as in the example below:

<img src="captcha.php" onclick="this.src='captcha.php?'+Math.random();return false;" alt="captcha image missing" title="" />
<br /><span style='font-size: 14px;'>click the image to get new letters</span>
<br />Please enter the letters in the box below<br />
<input type='text' name='captcha' style='width: 60px;' autocomplete='off' />

Then in your processing script you include the CAPTCHA script as in the example below:

$validate = $_POST['captcha'];
include('captcha.php');
if ($validate != "valid") $errors = "Wrong verification code entered";

Name the script below captcha.php.

You can download this script as a .txt file. Remember to rename the file as a .php file.

- - Start Script Here - -


<?php
//
// to validate the user entered value the variable $validate must be populated with the user input
// $validate will return with either "valid" or "invalid"
// if $validate is not set then a captcha image is generated
//
// to make the captcha harder for a bot to read, the font is random for each character and there are lines in the image
//
// this section validates the user input
session_start();
if (isset($validate)) {
  if (strlen($validate) == 6) {
    $validate = strtoupper($validate);  // make input upper case for compare
    if ($_SESSION['captcha'] == $validate) $validate = "valid"; else $validate = "invalid";
  } else $validate = "invalid";
} else {
//
// this section generates the captcha value
$char1 = chr(rand(65,90));
$char2 = chr(rand(65,90));
$char3 = chr(rand(65,90));
$char4 = chr(rand(65,90));
$char5 = chr(rand(65,90));
$char6 = chr(rand(65,90));
$_SESSION['captcha'] = $char1.$char2.$char3.$char4.$char5.$char6;
// create image
$im = @imagecreate(70,25);
$backgroundColor = imagecolorallocate($im,150,150,150);
$textColor = imagecolorallocate($im,0,0,0);
$lineColor = imagecolorallocate($im,100,100,100);
imageline($im,0,0,23,25,$lineColor);
imageline($im,23,0,46,25,$lineColor);
imageline($im,46,0,69,25,$lineColor);
imageline($im,0,25,70,0,$lineColor);
imagestring($im,rand(3,5),5,5,$char1,$textColor);
imagestring($im,rand(3,5),15,5,$char2,$textColor);
imagestring($im,rand(3,5),25,5,$char3,$textColor);
imagestring($im,rand(3,5),36,5,$char4,$textColor);
imagestring($im,rand(3,5),45,5,$char5,$textColor);
imagestring($im,rand(3,5),55,5,$char6,$textColor);
imagepng($im);
imagedestroy($im);
}
?>

- - End Script Here - -

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