codeigniter captcha helper is not increasing text font size
Codeigniter captcha helper doesn't allow to change the font size. The following will replace the default create_captcha function and allow you to change the font size. The CodeIgniter version I have used is 2.2.0. This is working/tested code.
Step 1: Create a new helper file named MY_captcha_helper.php and save it under at the root of CodeIgniter folder in application/helper. Content of the file:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');/** * CodeIgniter * * An open source application development framework for PHP 5.1.6 or newer * * @package CodeIgniter * @author ExpressionEngine Dev Team * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. * @license http://codeigniter.com/user_guide/license.html * @link http://codeigniter.com * @since Version 1.0 * @filesource */// ------------------------------------------------------------------------/** * CodeIgniter CAPTCHA Helper * * @package CodeIgniter * @subpackage Helpers * @category Helpers * @author ExpressionEngine Dev Team * @link http://codeigniter.com/user_guide/helpers/xml_helper.html */// ------------------------------------------------------------------------/** * Create CAPTCHA * * @access public * @param array array of data for the CAPTCHA * @param string path to create the image in * @param string URL to the CAPTCHA image folder * @param string server path to font * @return string */if ( ! function_exists('create_captcha')){ function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '') { $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200, 'font_size' => 5); foreach ($defaults as $key => $val) { if ( ! is_array($data)) { if ( ! isset($$key) OR $$key == '') { $$key = $val; } } else { $$key = ( ! isset($data[$key])) ? $val : $data[$key]; } } if ($img_path == '' OR $img_url == '') { return FALSE; } if ( ! @is_dir($img_path)) { return FALSE; } if ( ! is_writable($img_path)) { return FALSE; } if ( ! extension_loaded('gd')) { return FALSE; } // ----------------------------------- // Remove old images // ----------------------------------- list($usec, $sec) = explode(" ", microtime()); $now = ((float)$usec + (float)$sec); $current_dir = @opendir($img_path); while ($filename = @readdir($current_dir)) { if ($filename != "." and $filename != ".." and $filename != "index.html") { $name = str_replace(".jpg", "", $filename); if (($name + $expiration) < $now) { @unlink($img_path.$filename); } } } @closedir($current_dir); // ----------------------------------- // Do we have a "word" yet? // ----------------------------------- if ($word == '') { $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $str = ''; for ($i = 0; $i < 8; $i++) { $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1); } $word = $str; } // ----------------------------------- // Determine angle and position // ----------------------------------- $length = strlen($word); $angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0; $x_axis = rand(6, (360/$length)-16); $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height); // ----------------------------------- // Create image // ----------------------------------- // PHP.net recommends imagecreatetruecolor(), but it isn't always available if (function_exists('imagecreatetruecolor')) { $im = imagecreatetruecolor($img_width, $img_height); } else { $im = imagecreate($img_width, $img_height); } // ----------------------------------- // Assign colors // ----------------------------------- $bg_color = imagecolorallocate ($im, 255, 255, 255); $border_color = imagecolorallocate ($im, 153, 102, 102); $text_color = imagecolorallocate ($im, 204, 153, 153); $grid_color = imagecolorallocate($im, 255, 182, 182); $shadow_color = imagecolorallocate($im, 255, 240, 240); // ----------------------------------- // Create the rectangle // ----------------------------------- ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color); // ----------------------------------- // Create the spiral pattern // ----------------------------------- $theta = 1; $thetac = 7; $radius = 16; $circles = 20; $points = 32; for ($i = 0; $i < ($circles * $points) - 1; $i++) { $theta = $theta + $thetac; $rad = $radius * ($i / $points ); $x = ($rad * cos($theta)) + $x_axis; $y = ($rad * sin($theta)) + $y_axis; $theta = $theta + $thetac; $rad1 = $radius * (($i + 1) / $points); $x1 = ($rad1 * cos($theta)) + $x_axis; $y1 = ($rad1 * sin($theta )) + $y_axis; imageline($im, $x, $y, $x1, $y1, $grid_color); $theta = $theta - $thetac; } // ----------------------------------- // Write the text // ----------------------------------- $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE; if ($use_font == FALSE) { $font_size = $font_size != 5 ? $font_size : 5; $x = rand(0, $img_width/($length/3)); $y = 0; } else { $font_size = $font_size != 5 ? $font_size : 16; $x = rand(0, $img_width/($length/1.5)); $y = $font_size+2; } for ($i = 0; $i < strlen($word); $i++) { if ($use_font == FALSE) { $y = rand(0 , $img_height/2); imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color); $x += ($font_size*2); } else { $y = rand($img_height/2, $img_height-3); imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1)); $x += $font_size; } } // ----------------------------------- // Create the border // ----------------------------------- imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color); // ----------------------------------- // Generate the image // ----------------------------------- $img_name = $now.'.jpg'; ImageJPEG($im, $img_path.$img_name); $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />"; ImageDestroy($im); return array('word' => $word, 'time' => $now, 'image' => $img); }}// ------------------------------------------------------------------------/* End of file captcha_helper.php *//* Location: ./system/heleprs/captcha_helper.php */I have changed:
this
$defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);into this
$defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200, 'font_size' => 5);and this
if ($use_font == FALSE){ $font_size = 5; $x = rand(0, $img_width/($length/3)); $y = 0;}else{ $font_size = 16; $x = rand(0, $img_width/($length/1.5)); $y = $font_size+2;}into this
if ($use_font == FALSE){ $font_size = $font_size != 5 ? $font_size : 5; $x = rand(0, $img_width/($length/3)); $y = 0;}else{ $font_size = $font_size != 5 ? $font_size : 16; $x = rand(0, $img_width/($length/1.5)); $y = $font_size+2;}Step 2: Create a folder named captcha at the root of CodeIgniter folder (you might already have it) and give it permissions 755 under apache current user/group.
Step 3: Save your .ttf custom fonts under captcha/fonts.
Step 4: Your controller code:
$this->load->helper('captcha');$capache_config = array( 'img_path' => 'captcha/', 'img_url' => base_url() . 'captcha/', 'img_width' => 190, 'img_height' => 60, 'font_size' => 20, 'font_path' => FCPATH. 'captcha/font/verdana.ttf', 'expiration' => 7200);/* Generate the captcha */$captcha = create_captcha($capache_config);if ($captcha !== FALSE) { echo $captcha['image'];} else { die('No captcha was created');}Step 5: Example output:
Easier solution :)
1.Goto this file yourapplication->system-helpers->captcha_helper.php
2.Find the following line and apply change as you want i.e we change font size of the default captcha font size helpers settings.
NB.You can move the entier file to you application/core and suffix the file with MY.
$font_size = 28; //edited font for captcha size modification
// ----------------------------------- // Write the text // ----------------------------------- $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE; if ($use_font == FALSE) { $font_size = 5; $x = rand(0, $img_width/($length/3)); $y = 0; } else { $font_size = 28; //edited font for captcha size $x = rand(0, $img_width/($length/1.5)); $y = $font_size+2; }3.Clear catch on your testing browser4.Modify helper configuration on your controller or other places like FCPATH IS A MUST Thanks machineaddict!
$capache_config = array( 'img_path' => 'captcha/', 'img_url' => base_url() . 'captcha/', 'img_width' => '290', 'font_path' => FCPATH . 'captcha/font/captcha4.ttf', 'img_height' => 65, 'expiration' => 7200 );Expected Output :
BANG BANG I HIT THE GROUND !!!!
According to the Codeigniter Captcha Helper documentation, the native GD font has a size limit. You have to specify your own font to change the size:
font_size defaults to 16, the native GD font has a size limit. Specify a “true type” font for bigger sizes.
In my case, I downloaded a font from Google Fonts, saved it in my public html directory under my assets folder, and changed the font path to:
'font_path' => '../html/assets/fonts/Roboto-Black.ttf','font_size' => 16,And now I can change the font with the font_size attribute as expected.