Hi,
I wonder how people can make the dynamic image, like Alexa ranking button, or dynamic sign (have IP address, browser infomation...) How can they do that?

I don't know exactly where I can post this thing, so I post here.

Thankx

PHP creates dynamic images by using the GD library, first you have to check your PHP installation if it includes GD then you may want to take a look at this:

http://www.boutell.com/gd/

by using GD special functions it is possible to create PHP scripts that return images instead of HTML content

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AndreaVB

this is a little script I use to generate a random number inside a picture to validate user regitration:

<?php   /*Send header*/  Header("Content-Type: image/png");  /* initialize a session. */  session_start();  /*We'll set this variable later.*/  $new_string;  /*register the session variable. */  session_register('new_string');  /* set up image*/  /*The first number is the width and the second is the height*/  $im = ImageCreate(200, 40);    /*creates two variable to store color*/  $white = ImageColorAllocate($im, 255, 255, 255);  $black = ImageColorAllocate($im, 0, 0, 0);  /*random string generator.*/  /*The seed for the random number*/  srand((double)microtime()*1000000);   /*Runs the string through the md5 function--which is a function that encrypts a string, changing it into a 32 character string composed of numbers and lowercase letters*/  $string = md5(rand(0,9999));   /*Creates the new string. The first number is the point in the 32  character string where we will pull our string from. In other  words, PHP will count (beginning at 0) 17 characters into the  string. The 18th character in will be our beginning point  (remember, PHP starts counting from 0). From there, PHP  counts 5 characters from that point, and thus, we get our five  character string. The second number is the length of our  string--changing this number will give us different string  lengths.*/  $new_string = substr($string, 17, 5);    /*fill image with black*/  ImageFill($im, 0, 0, $black);   /*write string at coordinates (70,10) in the color white. (70, 10)  puts the string almost in the middle of the image.*/  ImageString($im, 4, 70, 10, $new_string, $white);   /*output to browser*/  ImagePNG($im);  ImageDestroy($im);   ?>

then save this as verify.php
by adding in your html the reference to this you'll se a random number inside an image

<img src="verify.php">

[Edited by admin on 31-03-2006 at 07:30 AM GMT]

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AndreaVB

Does anyone with more knowledge know anything on how to do this?

Thanks guys.

Ec2Link Website Hosting of E-Commerce Forum!

What do you mean more knowledge?  That's the answer of how to do it, how it's done, with an example!

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Everywhere's Local (pre-release), My company's website