Di sini contoh menggunakan captcha dengan codeigniter. Kod ini menggunakan contoh kod yang terdapat di Wiki web codeigniter. Satu table, satu fail controller, satu fail model dan satu folder diperlukan.<\/p>\n
Hasilnya boleh dilihat di sini >> Demo<\/a><\/p>\n 1. Bina satu folder ‘captcha’ di direktori utama (satu aras dengan folder ‘system’ dan ‘user_guide’)<\/p>\n 2. Bina satu table pangkalan data<\/p>\n 3. Bina satu fail captcha.php di dalam controller<\/p>\n 4. Bina satu fail mcaptcha.php di dalam model<\/p>\n 5. Bina fail myindex.php di dalam view<\/p>\n Hasilnya boleh dilihat di sini >> Demo<\/a><\/p>\n Selamat Mencuba…<\/p>\n\r\n-->ci_root\r\n -->captcha\r\n -->system\r\n -->user_guide<\/pre>\n
CREATE TABLE IF NOT EXISTS `captcha` (\r\n `captcha_id` bigint(13) unsigned NOT NULL auto_increment,\r\n `captcha_time` int(10) unsigned NOT NULL,\r\n `ip_address` varchar(16) NOT NULL default '0',\r\n `word` varchar(20) NOT NULL,\r\n PRIMARY KEY (`captcha_id`),\r\n KEY `word` (`word`)\r\n)<\/pre>\n
\r\nclass Captcha extends Controller {\r\n\r\n\tfunction Captcha()\r\n\t{\r\n\t parent::Controller();\t\r\n\t}\r\n \r\n function index()\r\n {\r\n $data['cap_img'] = $this->mcaptcha->make_captcha();\r\n $this->load->view('myindex',$data);\r\n }\r\n \r\n function mycaptcha()\r\n {\r\n $captcha = $this->input->post('captcha');\r\n if($this->mcaptcha->check_captcha($captcha)){\r\n $data['msg'] = \"Captcha match!\"; \r\n } else {\r\n $data['msg'] = \"Enter captcha . Please try again!\";\r\n }\r\n\t $captcha_result = '';\r\n\t $data['cap_img'] = $this->mcaptcha->make_captcha();\r\n $this->load->view('myindex', $data);\r\n }\r\n\r\n}<\/pre>\n\r\nclass Mcaptcha extends Model {\r\n\r\n\tfunction Mcaptcha()\r\n\t{\r\n\t\tparent::Model();\t\r\n\t}\r\n\t\r\n\tfunction make_captcha()\r\n\t{\r\n\t\t$this->load->plugin('captcha');\r\n\t\t$vals = array(\r\n\t\t\t'img_path' => 'captcha\/', \/\/ PATH for captcha ( *Must mkdir (htdocs)\/captcha )\r\n\t\t\t'img_url' => '..\/captcha\/', \/\/ URL for captcha img\r\n\t\t\t'img_width' => 200, \/\/ width\r\n\t\t\t'img_height' => 60, \/\/ height\r\n\t\t\t\/\/ 'font_path' => '..\/system\/fonts\/2.ttf',\r\n\t\t\t'expiration' => 7200\r\n\t\t); \r\n\t\t\/\/ Create captcha\r\n\t\t$cap = create_captcha($vals); \r\n\t\t\/\/ Write to DB\r\n\t\tif ($cap) {\r\n\t\t\t$data = array(\r\n\t\t\t\t'captcha_id' => '',\r\n\t\t\t\t'captcha_time' => $cap['time'],\r\n\t\t\t\t'ip_address' => $this->input->ip_address(),\r\n\t\t\t\t'word' => $cap['word']\r\n\t\t\t);\r\n\t\t\t$query = $this->db->insert_string('captcha', $data );\r\n\t\t\t$this->db->query($query);\r\n\t\t}else {\r\n\t\t\treturn 'Umm captcha not work' ;\r\n\t\t}\r\n\treturn $cap['image'];\r\n\t}\r\n\r\n\tfunction check_captcha($captcha)\r\n\t{ \r\n\t\t\/\/ Delete old data ( 2hours)\r\n\t\t$expiration = time()-7200 ;\r\n\t\t$sql = \"DELETE FROM captcha WHERE captcha_time < ? \";\r\n\t\t$binds = array($expiration);\r\n\t\t$query = $this->db->query($sql, $binds);\r\n \r\n\t\t\/\/checking input\r\n\t\t$sql = \"SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND captcha_time > ?\";\r\n\t\t$binds = array($captcha, $this->input->ip_address(), $expiration);\r\n\t\t$query = $this->db->query($sql, $binds);\r\n\t\t$row = $query->row();\r\n\r\n\t\tif ($row->count > 0)\r\n\t\t{\r\n\t\t\treturn true;\r\n\t\t}\r\n\t\treturn false;\r\n\t}\r\n\r\n}<\/pre>\n\r\nif(isset($msg)) echo ''.$msg.'<\/font>
';\r\necho form_open('captcha\/mycaptcha');\r\n$captcha = array('name' => 'captcha');\r\n\r\n\r\n
\r\n <\/td>\r\n <\/tr>\r\n \r\n <\/td>\r\n <\/tr>\r\n \r\n <\/td>\r\n <\/td>\r\n <\/tr> \r\n<\/table>\r\n\r\necho form_close();\r\n\r\n<\/pre>\n