Captcha in codeigniter - php

Question

hi i am generating captcha in codeigniter. I am getting problems while generating captcha. I am using captcha code inside the controller but it is giving an error where i am wrong.
Here is my controller code.
public function captcha(){
//$this->load->library('monofont.ttf');
$image_width = 120;
$image_height = 40;
$characters_on_image = 6;
//include('monofont.ttf');
$font = './monofont.ttf';
$possible_letters = '23456789bcdfghjkmnpqrstvwxyz';
$random_dots = 0;
$random_lines = 20;
$captcha_text_color="0x142864";
$captcha_noice_color = "0x142864";
$code = '';
$i = 0;
while ($i < $characters_on_image) {
$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
$i++;
}
$newPwd = $this->hexrgb();
$font_size = $image_height * 0.75;
$image = #imagecreate($image_width, $image_height);
$background_color = imagecolorallocate($image, 255, 255, 255);
$arr_text_color = hexrgb($captcha_text_color);
$text_color = imagecolorallocate($image, $arr_text_color['red'],
$arr_text_color['green'], $arr_text_color['blue']);
$arr_noice_color = hexrgb($captcha_noice_color);
$image_noise_color = imagecolorallocate($image, $arr_noice_color['red'],
$arr_noice_color['green'], $arr_noice_color['blue']);
for( $i=0; $i<$random_dots; $i++ ) {
imagefilledellipse($image, mt_rand(0,$image_width),
mt_rand(0,$image_height), 2, 3, $image_noise_color);
}
for( $i=0; $i<$random_lines; $i++ ) {
imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height),
mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color);
}
$textbox = imagettfbbox($font_size, 0, $font, $code);
$x = ($image_width - $textbox[4])/2;
$y = ($image_height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code);
header('Content-Type: image/jpeg');// defining the image type to be shown in browser widow
imagejpeg($image);//showing the image
imagedestroy($image);//destroying the image instance
function hexrgb ($hexstr)
{
$int = hexdec($hexstr);
return array("red" => 0xFF & ($int >> 0x10),
"green" => 0xFF & ($int >> 0x8),
"blue" => 0xFF & $int);
}
echo $code;
exit;
}
when ever i echo the $code its giving error
Call to undefined function hexrgb()
how to fix this?
my monofont.ttf file is placed inside the controller.

Answer 1

You should also pass parameter to function hexrgb(param) or in function declaration you have to make this parameter optional. simply problem is in function argument

Answer 2

Try This,
function captcha()
{
$image_width = 120;
$image_height = 40;
$characters_on_image = 6;
$font = FCPATH.'assets/monofont.ttf';
/* set font path */
$possible_letters = '23456789bcdfghjkmnpqrstvwxyz';
$random_dots = 0;
$random_lines = 20;
$captcha_text_color="0x142864";
$captcha_noice_color = "0x142864";
$code = '';
$i = 0;
while ($i < $characters_on_image) {
$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
$i++;
}
$this->session->set_flashdata('latter_code',$code);
$font_size = $image_height * 0.75;
$image = #imagecreate($image_width, $image_height);
$this->output->set_content_type('jpeg'); // You could also use ".jpeg" which will have the full stop removed before looking in config/mimes.php
$background_color = imagecolorallocate($image, 255, 255, 255);
$arr_text_color = $this->hexrgb($captcha_text_color);
/* changes of hexrgb to $this->hexrgb */
$text_color = imagecolorallocate($image, $arr_text_color['red'],
$arr_text_color['green'], $arr_text_color['blue']);
$arr_noice_color = $this->hexrgb($captcha_noice_color);
/* changes of hexrgb to $this->hexrgb */
$image_noise_color = imagecolorallocate($image, $arr_noice_color['red'],
$arr_noice_color['green'], $arr_noice_color['blue']);
/* generating the dots randomly in background */
for( $i=0; $i<$random_dots; $i++ ) {
imagefilledellipse($image, mt_rand(0,$image_width),
mt_rand(0,$image_height), 2, 3, $image_noise_color);
}
/* generating lines randomly in background of image */
for( $i=0; $i<$random_lines; $i++ ) {
imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height),
mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color);
}
/* create a text box and add 6 letters code in it */
$textbox = imagettfbbox($font_size, 0, $font, $code);
$x = ($image_width - $textbox[4])/2;
$y = ($image_height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code);
/* Show captcha image in the page html page */
imagejpeg($image);//showing the image
imagedestroy($image);//destroying the image instance
}
set this function of after captcha function
function hexrgb ($hexstr)
{
$int = hexdec($hexstr);
return array("red" => 0xFF & ($int >> 0x10),
"green" => 0xFF & ($int >> 0x8),
"blue" => 0xFF & $int);
}
and you want to set view file
<img src="<?php echo site_url('auth/captch')?>" alt="" class="captcha_image" id='captchaimg' style="height: 30px;width:100px"/>