Problem with inserting an image in a form using GD! - php

Question

I'm trying to develop a captcha class for my website everything was doing fine until I tried to embed the image generated with PHP GD inside my subscription form!
Here is the code of my class:
<?php
//captcha.php
header("Content-type: image/png");
class Captcha {
// some attributes bla bla
public function __construct($new_string_length,$new_width_picture,
$new_height_picture,$new_string_color) {
$this->string_length = $new_string_length;
$this->width_picture = $new_width_picture;
$this->height_picture = $new_height_picture;
$this->string_color = $new_string_color;
}
public function getString() {
return $this->string;
}
public function generateRandomString() {
$str = "";
$basket = "abcdefghijklmnopqrstuvwxyz0123456789";
$basket_length = strlen($basket);
srand ((double) microtime() * 1000000);
for($i=0;$i<$this->string_length;$i++) {
$generated_pos = rand(0,$basket_length);
$str_substr = substr($basket,$generated_pos-1,1);
if(!is_numeric($str_substr)) {
// if the character picked up isn't numeric
if(rand(0,1)==1) {
// we randomly upper the character
$str_substr = strtoupper($str_substr);
}
}
$str = $str.$str_substr;
}
$this->string = $str;
}
**public function generatePictureFromString($new_string) {
$root_fonts = '../fonts/';
srand ((double) microtime() * 1000000);
$list_fonts = array('ABODE.ttf','acme.ttf','Alcohole.ttf',
'Anarchistica.ttf','AMERIKAA.ttf');
$image = #imagecreatetruecolor($this->width_picture,$this->height_picture);
$noir = imagecolorallocate($image,0,0,0);
$clr = explode('/',$this->string_color);
$clr = imagecolorallocate($image,$clr[0],$clr[1],$clr[2]);
for($i=0;$i<strlen($new_string);$i++) {
imagettftext($image,rand(($this->height_picture/4.3),($this->height_picture)/4.2),
rand(-45,45),($this->width_picture)/(5*$this->string_length)+($this->width_picture)/($this->string_length)*$i,0.6*($this->height_picture),$clr,
$root_fonts.$list_fonts[rand(0,count($list_fonts)-1)],substr($new_string,$i,1));
}
imagepng($image);
imagedestroy($image);
}**
}
I willingly avoided to show some useless part of the class. The class itself works perfectly when I call the generatePictureFromString(..) method like this:
<?php
//testeur_classe.php
require_once '../classes/captcha.php';
$captcha = new Captcha(5,200,80,"255/255/255");
$captcha->generateRandomString();
$str = $captcha->getString();
$captcha->generatePictureFromString($str);
?>
But when I try to insert the picture generated in my form using:
<img src="<?php echo PATH_ROOT.'classes\testeur_classe.php'; ?>"/>
nothing is displayed!
How am I supposed to do that ?
Thank you!

Answer 1

OK: What do you see if you open classes\testeur_classe.php in the browser?
(p.s. the same question as Ryan Graham asked you in question comment)
OK: I think you must set correct headers before picture output like:
header('Content-type: image/png');
p.s.
This code works, just tried it on my machine. You must have bug on <img src="..." or <base href="" if you have one. Could you show us your html output so we can see what could be the problem?

Answer 2

You need to make sure that the image src is a valid URL to the script. Looking at the backslash in there my guess would be that that is in fact a filesystem path.