Captcha problem on host

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PHP

hi
I have write a php code that create captcha code and i use it in login form
my captcha code work on local machine but after I my site on host it does not show the captcha code
I check my host and it's gd library is enable
this is my captcha code

<?php
session_start();
function random_string($len=3, $str='')  
 {	for($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. 	
 
 	
 $str.=rand(1,9);	 //If the number is not good we generate another one	
  
 }	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); 
 // جدا کردن رشته به صورت 5 کاراکتر
  $letter1=substr($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("pic.png");
 //Get a random angle for each letter to be rotated with.
 // تعیین زاویه نمایش کاراکترها
 $angle1 = rand(0, 0);
 $angle2 = rand(0, 0);
 $angle3 = rand(0, 0);
 $angle4 = rand(0, 0);
 $angle5 = rand(0, 0);
 //Get a random font. (In this examples, the fonts are located in "fonts" directory and named from 1.ttf to 10.ttf)
 // تعیین فونت برای نمایش هر یک از کاراکترها
 $font1 = '../font/'.rand(1,2).'.ttf';
 $font2 = '../font/'.rand(1,2).'.ttf';
 $font3 = '../font/'.rand(1,2).'.ttf';
 $font4 = '../font/'.rand(1,2).'.ttf';
 $font5 = '../font/'.rand(1,2).'.ttf';
 
 //Define a table with colors (the values are the RGB components for each color).
 
 //Get a random color for each letter.
 // تعیین رنگ برای هر یک از کاراکتر ها
 $color1=rand(0,10);
 $color2=rand(0,10);
 $color3=rand(0,10);
 $color4=rand(0,10);
 $color5=rand(0,10);
 //Allocate colors for letters.
 $textColor1 = imagecolorallocate ($image, $color1,10, $color3);
 $textColor2 = imagecolorallocate ($image, $color4,13, $color2);
 $textColor3 = imagecolorallocate ($image, $color2,20, $color1);
 $textColor4 = imagecolorallocate ($image, $color3,10, $color5);
 $textColor5 = imagecolorallocate ($image, $color5,20, $color4);
 
 //Write text to the image using TrueType fonts.
 // تعیین سایز برای هر یک از کاراکترها
 $size1 = rand(17,20);
 $size2 = rand(17,20);
 $size3 = rand(17,20);
 $size4 = rand(17,20);
 $size5 = rand(17,20);
 // تعیین موقعیت نمایش برای هر کدام از کاراکترها
 $y_pos1 = rand(28,28);
 $y_pos2 = rand(28,28);
 $y_pos3 = rand(28,28);
 $y_pos4 = rand(28,28);
 $y_pos5 = rand(28,28);
 
 imagettftext($image, $size1, $angle1, 10, $y_pos1, $textColor1, $font1, $letter1);
 imagettftext($image, $size2, $angle2, 30, $y_pos2, $textColor2, $font2, $letter2);
 imagettftext($image, $size3, $angle3, 55, $y_pos3, $textColor3, $font3, $letter3);
 imagettftext($image, $size4, $angle4, 75, $y_pos4, $textColor4, $font4, $letter4);
 imagettftext($image, $size5, $angle5, 92, $y_pos5, $textColor5, $font5, $letter5);
 
 $_SESSION['captcha'] = $rand_str;
 
 header("C//ontent-type: image/png");
 //Output image to browser
 //imagejpeg($image);
 imagepng($image);
 //Destroys the 
 imagedestroy($image); 



?> 

Thanks for your help