Neverside

http://www.freetype.org/

___________________

http://celerondude.com

one more question, hopefully you don't mind the off topic nature, but if I do have to download the gd lib. Where would I extract it to?

___________________

Andy

the extensions directory, usually \php\extensions

___________________

http://celerondude.com

thanks a bunch!

___________________

Andy

Quote:

Originally posted by CDude
TTFtext requires freetype2. You'll have to use imagestring if you r server doesn't have it installed.

Ill come up with a version that uses imagestring in a few min

___________________

http://www.philbrodeur.com - Expert PHP Development and Tutorials

OK, this is version 2, more or less.

+ Automatically checks for TTF enableness and adjusts
+ random text position
+ random background, but text is still always ledgible

The circles are GD2; if you dont have it edit out the loop

PHP:

<?php

    define('X_SIZE', 135);
    define('Y_SIZE', 60);
    define('BORDER_THICKNESS', 5);
    define('LEGNTH', 8);
    # ttf settings
    define('FONT', 'arialbd.ttf');
    define('FONTSIZE', 15);
    # nonnTTF settings
    define('SAFEFONT', 5); # number 1-5
    
    # detect TTF
    function_exists('imagettfbbox') ? define('TTF_ENABLED', TRUE) : define('TTF_ENABLED', FALSE);
    
    # if we don't want TTF, we'll need this function
    function ImageStringAlign(&$image, $font, $x, $y, $s, $col) {
         switch ($x) {
           case 0: $x = 2; break;
           case 1: $x = floor((ImageSX($image) / 2) - ((ImageFontWidth($font) * strlen($s)) / 2)); break;
           case 2: $x = (ImageSX($image) - (ImageFontWidth($font) * strlen($s))) - 2; break;
         }
         switch ($y) {
           case 0: $y = 2; break;
           case 1: $y = floor((ImageSY($image) / 2) - (ImageFontHeight($font) / 2)); break;
           case 2: $y = (ImageSY($image) - ImageFontHeight($font)) - 2; break;
         }
         ImageString($image, $font, $x, $y, $s, $col);
    }
    
    
    # let the browser know its getting a image, not a text file or something
      header("Content-type: image/png");
    
    # lets make the image
    # First Argument is X Axis, Second is Y
    $image = imagecreate(X_SIZE,Y_SIZE) or die ('Cannot Initialize new GD image stream');
    
    # now we have to specify the colors we'll use
    # the first color is background color (automatically)
    $grey = imageColorAllocate($image,170,170,170); # background - its actually going to be our border!
    $lightBlue = imageColorAllocate($image,102,153,255);
    $black = imageColorAllocate($image,0,0,0);
    
    # int ImageFilledRectangle (int im, int x1, int y1, int x2, int y2, int col)     
    imageFilledRectangle($image, BORDER_THICKNESS, BORDER_THICKNESS, (X_SIZE-BORDER_THICKNESS), (Y_SIZE-BORDER_THICKNESS), $lightBlue);
    
    # some random circles
    
    for ($i=1;$i<=9;$i++) {
        $randomcolor = imagecolorallocate ($image , rand(150,255), rand(150,255),rand(150,255));
        imagefilledellipse($image,rand(0,X_SIZE-BORDER_THICKNESS),rand(0,Y_SIZE-BORDER_THICKNESS), rand(20,70),rand(20,70),$randomcolor);
    }

    # word
    
    $word = substr(md5((time()/rand(1,2147483647))), 0, LEGNTH);
    
    # thats nice, but people get confused with 0 and O and o so0O
    
    $w = str_replace('O', 0, strtoupper($word));
    
    if(TTF_ENABLED) {
        $text_bbox = ImageTTFBBox(FONTSIZE, 0, FONT, $w);
        $text_pos_x = (X_SIZE - ($text_bbox[2] - $text_bbox[0])) / 2;
        $text_pos_y = (Y_SIZE - ($text_bbox[1] - $text_bbox[7])) / 2;
        $text_pos_y -= $text_bbox[7];
        $text_pos_x += rand(-10,10);
        $text_pos_y += rand(-10,10);
        # ImageTTFText (int im, int size, int angle, int x, int y, int col, string fontfile, string text) 
        imageTTFText($image, FONTSIZE, 0, $text_pos_x, $text_pos_y, $black, FONT, $w);
    } else {
        # dont use TTF
        # image handle, font = 1 to 6 or file, $x - see next lines, $y - see next lines, text, color
        # $x and $y values
        # 0 align left or top
        # 1 align center
        # 2 align right or bottom
        ImageStringAlign($image, SAFEFONT, rand(1,3), rand(1,3), $w, $black);
    }
    
    # send the image
    imagePNG($image);
    # free memory
    imageDestroy($image);
?>

___________________

http://www.philbrodeur.com - Expert PHP Development and Tutorials

Last edited by Phil, July 30th, 2003 10:55 PM (Edited 1 times)

Nice Tutorial!

___________________

http://lukeblackman.com

Thanks Phil for this script, it's very usefull!

I need some more help with it so I'm hoping someone can!

I have the script working as it is and would like to use it in a registration script, so i'm guesing you would need to do something like if "code from imput box on form = code from image continue with registration"

To check that the varible $w does infact contain the code on the image I tried to echo it near the end of the script.

PHP:

<?php

# send the image
imagePNG($image);
echo $w;
# free memory
imageDestroy($image); 

?>

but it does not echo, so would someone be able to tell me 1) why wont it echo and 2) am I on the right lines to use it in a registration script.

Many thanks

doo

___________________

Comming soon.....The Lord of The Links

TTT

Please anyone

___________________

Comming soon.....The Lord of The Links

remember, you sent an image header.

Heres what to do:

when you create the file, use a normal header

change imgpng to store a file (2nd param, http://us2.php.net/imagepng) in a tmp dir

in the form, put a field "confirm" thats a normal text box

put a hidden field "real_word" which is an md5($w) (so that a robot cant just check the code).

On form proccess page, do

if(md5($_POST['confirm'])===$_POST['real_word']){

thats it!

___________________

http://www.philbrodeur.com - Expert PHP Development and Tutorials