IMG validation problem

[EagerWolf]

Here is code:

 

imggen.php //Generates img

<?
//start a session 
session_start();
//this function is called recursivelly
  function random_string($len=5, $str='')
  {
for($i=1; $i<=$len; $i++)
        {
        //generates a random number that will be the ASCII code of the character.
//We only want numbers (ascii code from 48 to 57) and caps letters. 
 $ord=rand(48, 90);
 if((($ord >= 48) && ($ord <= 57)) || (($ord >= 65) && ($ord<= 90))) 
$str.=chr($ord);
 //If the number is not good we generate another one
else
	$str.=random_string(1);	                                       
}
return $str;
}
                                       
//create the random string using the upper function 
//(if you want more than 5 characters just modify the parameter)
$rand_str=random_string(5);
                                    
//We memorize the md5 sum of the string into a session variable
$_SESSION['image_value'] = md5($rand_str);
                              
//Get each letter in one valiable, we will format all letters different
$letter1=substr($rand_str,0,1);
$letter2=substr($rand_str,1,1);
$letter3=substr($rand_str,2,1);
$letter4=substr($rand_str,3,1);
$letter5=substr($rand_str,4,1);
                                       
//Creates an image from a png file. If you want to use gif or jpg images, 
//just use the coresponding functions: imagecreatefromjpeg and imagecreatefromgif.
$image=imagecreatefrompng("image.png");
                                       
//Get a random angle for each letter to be rotated with.
$maxkot = 15;
$minkot = -15;
$angle1 = rand($minkot, $maxkot);
$angle2 = rand($minkot, $maxkot);
$angle3 = rand($minkot, $maxkot);
$angle4 = rand($minkot, $maxkot);
$angle5 = rand($minkot, $maxkot);
                                 
//Get a random font. (In this examples, the fonts are located in "fonts" directory and named from 1.ttf to 10.ttf)
$font1 = "fonts/".rand(1, 5).".ttf";
$font2 = "fonts/".rand(1, 5).".ttf";
$font3 = "fonts/".rand(1, 5).".ttf";
$font4 = "fonts/".rand(1, 5).".ttf";
$font5 = "fonts/".rand(1, 5).".ttf";
                                       
//Define a table with colors (the values are the RGB components for each color).
$colors[0]=array(7,7,130);
$colors[1]=array(1,101,4);
$colors[2]=array(101,32,1);
$colors[3]=array(89,0,0);
$colors[4]=array(61,0,89);
$colors[5]=array(0,84,89);
                                       
//Get a random color for each letter.
$color1=rand(0, 5);
$color2=rand(0, 5);
$color3=rand(0, 5);
$color4=rand(0, 5);
$color5=rand(0, 5);
                                       
//Allocate colors for letters.
$textColor1 = imagecolorallocate ($image, $colors[$color1][0],$colors[$color1][1], $colors[$color1][2]);
$textColor2 = imagecolorallocate ($image, $colors[$color2][0],$colors[$color2][1], $colors[$color2][2]);
$textColor3 = imagecolorallocate ($image, $colors[$color3][0],$colors[$color3][1], $colors[$color3][2]);
$textColor4 = imagecolorallocate ($image, $colors[$color4][0],$colors[$color4][1], $colors[$color4][2]);
$textColor4 = imagecolorallocate ($image, $colors[$color5][0],$colors[$color5][1], $colors[$color5][2]);

//Write text to the image using TrueType fonts.
$size = 40;

imagettftext($image, $size, $angle1, 15, $size+rand(15,50), $textColor1, $font1, $letter1);
imagettftext($image, $size, $angle2, 50, $size+rand(15,50), $textColor2, $font2, $letter2);
imagettftext($image, $size, $angle3, 85, $size+rand(15,50), $textColor3, $font3, $letter3);
imagettftext($image, $size, $angle4, 120, $size+rand(15,50), $textColor4, $font4, $letter4);
imagettftext($image, $size, $angle5, 155, $size+rand(15,50), $textColor5, $font5, $letter5);

header('Content-type: image/jpeg');
//Output image to browser
imagejpeg($image);
//Destroys the image
imagedestroy($image); 
?>

 

show.php

<?
session_start();
?>
<img src="imggen.php">
<form method="POST" action="valid.php">
<input type="text" name="numcheck">
<input type="submit" name="Submit" value="Sprejmi">
<input type="hidden" name="hidnum" value="<? print $_SESSION['image_value']; ?>">
</form>

<?php print_r($_SESSION); ?>

 

I have experienced strange problem. When I open file show.php image is being showed, but nothing is being stored in $_SESSION on reload in $_SESSION is stored key from previous img...

 

Any idea?

 

10x for your help!