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1 | <?php |
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2 | |||
3 | if (!defined('BASEPATH')) { |
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4 | exit('No direct script access allowed'); |
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5 | } |
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6 | /** |
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7 | * CodeIgniter |
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8 | * |
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9 | * An open source application development framework for PHP 4.3.2 or newer |
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10 | * |
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11 | * @package CodeIgniter |
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12 | * @author ExpressionEngine Dev Team |
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13 | * @copyright Copyright (c) 2006, EllisLab, Inc. |
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14 | * @license http://codeigniter.com/user_guide/license.html |
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15 | * @link http://codeigniter.com |
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16 | * @since Version 1.0 |
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17 | * @filesource |
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18 | */ |
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19 | // ------------------------------------------------------------------------ |
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20 | |||
21 | /* |
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22 | Instructions: |
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23 | |||
24 | Load the plugin using: |
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25 | |||
26 | $this->load->helper('captcha'); |
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27 | |||
28 | Once loaded you can generate a captcha like this: |
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29 | |||
30 | $vals = array( |
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31 | 'word' => 'Random word', |
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32 | 'img_path' => './captcha/', |
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33 | 'img_url' => 'http://www.your-site.com/captcha/', |
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34 | 'font_path' => './system/texb.ttf', |
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35 | 'img_width' => rand(500, 600), |
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36 | 'img_height' => rand(80, 120), |
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37 | 'expiration' => 7200 |
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38 | ); |
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39 | |||
40 | $cap = create_captcha($vals); |
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41 | echo $cap['image']; |
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42 | |||
43 | |||
44 | NOTES: |
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45 | |||
46 | The captcha function requires the GD image library. |
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47 | |||
48 | Only the img_path and img_url are required. |
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49 | |||
50 | If a "word" is not supplied, the function will generate a random |
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51 | ASCII string. You might put together your own word library that |
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52 | you can draw randomly from. |
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53 | |||
54 | If you do not specify a path to a TRUE TYPE font, the native ugly GD |
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55 | font will be used. |
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56 | |||
57 | The "captcha" folder must be writable (666, or 777) |
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58 | |||
59 | The "expiration" (in seconds) signifies how long an image will |
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60 | remain in the captcha folder before it will be deleted. The default |
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61 | is two hours. |
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62 | |||
63 | RETURNED DATA |
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64 | |||
65 | The create_captcha() function returns an associative array with this data: |
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66 | |||
67 | [array] |
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68 | ( |
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69 | 'image' => IMAGE TAG |
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70 | 'time' => TIMESTAMP (in microtime) |
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71 | 'word' => CAPTCHA WORD |
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72 | ) |
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73 | |||
74 | The "image" is the actual image tag: |
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75 | <img src="http://your-site.com/captcha/12345.jpg" width="140" height="50" /> |
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76 | |||
77 | The "time" is the micro timestamp used as the image name without the file |
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78 | extension. It will be a number like this: 1139612155.3422 |
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79 | |||
80 | The "word" is the word that appears in the captcha image, which if not |
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81 | supplied to the function, will be a random string. |
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82 | |||
83 | |||
84 | ADDING A DATABASE |
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85 | |||
86 | In order for the captcha function to prevent someone from posting, you will need |
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87 | to add the information returned from create_captcha() function to your database. |
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88 | Then, when the data from the form is submitted by the user you will need to verify |
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89 | that the data exists in the database and has not expired. |
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90 | |||
91 | Here is a table prototype: |
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92 | |||
93 | CREATE TABLE captcha ( |
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94 | captcha_id bigint(13) unsigned NOT NULL auto_increment, |
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95 | captcha_time int(10) unsigned NOT NULL, |
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96 | ip_address varchar(16) default '0' NOT NULL, |
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97 | word varchar(20) NOT NULL, |
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98 | PRIMARY KEY (captcha_id), |
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99 | KEY (word) |
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100 | ) |
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101 | |||
102 | |||
103 | Here is an example of usage with a DB. |
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104 | |||
105 | On the page where the captcha will be shown you'll have something like this: |
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106 | |||
107 | $this->load->helper('captcha'); |
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108 | $vals = array( |
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109 | 'img_path' => './captcha/', |
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110 | 'img_url' => 'http://www.your-site.com/captcha/' |
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111 | ); |
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112 | |||
113 | $cap = create_captcha($vals); |
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114 | |||
115 | $data = array( |
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116 | 'captcha_id' => '', |
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117 | 'captcha_time' => $cap['time'], |
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118 | 'ip_address' => $this->input->ip_address(), |
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119 | 'word' => $cap['word'] |
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120 | ); |
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121 | |||
122 | $query = $this->db->insert_string('captcha', $data); |
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123 | $this->db->query($query); |
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124 | |||
125 | echo 'Submit the word you see below:'; |
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126 | echo $cap['image']; |
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127 | echo '<input type="text" name="captcha" value="" />'; |
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128 | |||
129 | |||
130 | Then, on the page that accepts the submission you'll have something like this: |
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131 | |||
132 | // First, delete old captchas |
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133 | $expiration = time()-7200; // Two hour limit |
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134 | $DB->query("DELETE FROM captcha WHERE captcha_time < ".$expiration); |
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135 | |||
136 | // Then see if a captcha exists: |
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137 | $sql = "SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND date > ?"; |
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138 | $binds = array($_POST['captcha'], $this->input->ip_address(), $expiration); |
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139 | $query = $this->db->query($sql, $binds); |
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140 | $row = $query->row(); |
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141 | |||
142 | if ($row->count == 0) |
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143 | { |
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144 | echo "You must submit the word that appears in the image"; |
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145 | } |
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146 | |||
147 | */ |
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148 | |||
149 | /** |
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150 | |========================================================== |
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151 | | Create Captcha |
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152 | |========================================================== |
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153 | | |
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154 | */ |
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155 | if (!function_exists('create_captcha')) { |
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156 | |||
157 | function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '') { |
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158 | /** |
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159 | * Function to create a random color |
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160 | * Note: We aren't using this outside this function so we will sit it inside |
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161 | * @auteur mastercode.nl |
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162 | * @param $type string Mode for the color |
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163 | * @return int |
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164 | * */ |
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165 | if (!function_exists('color')) { |
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166 | |||
167 | function color($type) { |
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168 | switch ($type) { |
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169 | case 'bg': |
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170 | //$color = rand(224,255); |
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171 | $color = 255; |
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172 | break; |
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173 | case 'text': |
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174 | $color = rand(0, 127); |
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175 | break; |
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176 | case 'grid': |
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177 | $color = rand(200, 224); |
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178 | break; |
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179 | default: |
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180 | $color = rand(0, 255); |
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181 | break; |
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182 | } |
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183 | return $color; |
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184 | } |
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185 | |||
186 | } |
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187 | |||
188 | $defaults = [ |
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189 | 'word' => '', |
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190 | 'img_path' => '', |
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191 | 'img_url' => '', |
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192 | 'img_width' => '150', |
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193 | 'img_height' => '30', |
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194 | 'font_size' => '', |
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195 | 'font_path' => '', |
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196 | 'show_grid' => true, |
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197 | 'skew' => true, |
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198 | 'expiration' => 7200, |
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199 | 'alt' => 'captcha', |
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200 | ]; |
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201 | |||
202 | foreach ($defaults as $key => $val) { |
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203 | if (!is_array($data)) { |
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204 | if (!isset($$key) OR $ $key == '') { |
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205 | $$key = $val; |
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206 | } |
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207 | } else { |
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208 | $$key = (!isset($data[$key])) ? $val : $data[$key]; |
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209 | } |
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210 | } |
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211 | |||
212 | if ($img_path == '' OR $img_url == '') { |
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213 | |||
214 | return FALSE; |
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215 | } |
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216 | |||
217 | if (!@is_dir($img_path)) { |
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218 | return FALSE; |
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219 | } |
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220 | |||
221 | if (!is_really_writable($img_path)) { |
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222 | return FALSE; |
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223 | } |
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224 | |||
225 | if (!extension_loaded('gd')) { |
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226 | return FALSE; |
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227 | } |
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228 | |||
229 | // ----------------------------------- |
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230 | // Select random Font from folder |
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231 | // ----------------------------------- |
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232 | |||
233 | if (is_dir($font_path)) { |
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234 | $handle = opendir($font_path); |
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235 | |||
236 | while (($file = @readdir($handle)) !== false) { |
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237 | if (!in_array($file, ['.', '..']) && substr($file, strlen($file) - 4, 4) == '.ttf') { |
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238 | $fonts[] = $file; |
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239 | } |
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240 | } |
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241 | |||
242 | $font_file = $font_path . DIRECTORY_SEPARATOR . $fonts[array_rand($fonts)]; |
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243 | } else { |
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244 | $font_file = $font_path; |
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245 | } |
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246 | |||
247 | // ----------------------------------- |
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248 | // Remove old images |
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249 | // ----------------------------------- |
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250 | |||
251 | list($usec, $sec) = explode(' ', microtime()); |
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252 | $now = ((float) $usec + (float) $sec); |
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253 | |||
254 | $current_dir = @opendir($img_path); |
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255 | |||
256 | while ($filename = @readdir($current_dir)) { |
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257 | if ($filename != '.' and $filename != '..' and $filename != 'index.html') { |
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258 | $name = str_replace('.png', '', $filename); |
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259 | |||
260 | if (($name + $expiration) < $now) { |
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0 ignored issues
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261 | @unlink($img_path . $filename); |
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262 | } |
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263 | } |
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264 | } |
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265 | |||
266 | @closedir($current_dir); |
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267 | |||
268 | // ----------------------------------- |
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269 | // Do we have a "word" yet? |
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270 | // ----------------------------------- |
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271 | |||
272 | if ($word == '') { |
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0 ignored issues
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The variable
$word seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition?
This error can happen if you refactor code and forget to move the variable initialization. Let’s take a look at a simple example: function someFunction() {
$x = 5;
echo $x;
}
The above code is perfectly fine. Now imagine that we re-order the statements: function someFunction() {
echo $x;
$x = 5;
}
In that case,
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273 | // No Zero (for user clarity); |
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274 | $pool = '123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
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275 | |||
276 | $str = ''; |
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277 | View Code Duplication | for ($i = 0; $i < 6; $i++) { |
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278 | $str .= substr($pool, mt_rand(0, strlen($pool) - 1), 1); |
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279 | } |
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280 | |||
281 | $word = strtoupper($str); |
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282 | } |
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283 | |||
284 | // ----------------------------------- |
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285 | // Length of Word |
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286 | // ----------------------------------- |
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287 | |||
288 | $length = strlen($word); |
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289 | |||
290 | // ----------------------------------- |
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291 | // Create image |
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292 | // ----------------------------------- |
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293 | |||
294 | $im = imagecreatetruecolor($img_width, $img_height); |
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0 ignored issues
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295 | |||
296 | // ----------------------------------- |
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297 | // Assign colors |
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298 | // ----------------------------------- |
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299 | |||
300 | $bg_color = imagecolorallocatealpha($im, color('bg'), color('bg'), color('bg'), 0); |
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301 | $border_color = imagecolorallocate($im, 255, 255, 255); |
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302 | $text_color = imagecolorallocate($im, color('text'), color('text'), color('text')); |
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303 | $grid_color[] = imagecolorallocate($im, color('grid'), color('grid'), color('grid')); |
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304 | $grid_color[] = $grid_color[0] + 150; |
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305 | $grid_color[] = $grid_color[0] + 180; |
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306 | $grid_color[] = $grid_color[0] + 210; |
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307 | $shadow_color = imagecolorallocate($im, 255, 240, 240); |
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308 | |||
309 | // ----------------------------------- |
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310 | // Create the rectangle |
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311 | // ----------------------------------- |
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312 | |||
313 | imagefilledrectangle($im, 0, 0, $img_width, $img_height, $bg_color); |
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314 | |||
315 | if ($show_grid == TRUE) { |
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0 ignored issues
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316 | // X grid |
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317 | $grid = rand(20, 25); |
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318 | View Code Duplication | for ($x = 0; $x < $img_width; $x += mt_rand($grid - 2, $grid + 2)) { |
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319 | $current_colour = $grid_color[array_rand($grid_color)]; |
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320 | imagedashedline($im, mt_rand($x - 3, $x + 3), mt_rand(0, 4), mt_rand($x - 3, $x + 3), mt_rand($img_height - 5, $img_height), $current_colour); |
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321 | } |
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322 | |||
323 | // Y grid |
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324 | View Code Duplication | for ($y = 0; $y < $img_height; $y += mt_rand($grid - 2, $grid + 2)) { |
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325 | $current_colour = $grid_color[array_rand($grid_color)]; |
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326 | imageline($im, mt_rand(0, 4), mt_rand($y - 3, $y), mt_rand($img_width - 5, $img_width), mt_rand($y - 3, $y), $current_colour); |
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327 | } |
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328 | } |
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329 | |||
330 | // ----------------------------------- |
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331 | // Write the text |
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332 | // ----------------------------------- |
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333 | |||
334 | $use_font = ($font_file != '' AND file_exists($font_file) AND function_exists('imagettftext')) ? TRUE : FALSE; |
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335 | |||
336 | if ($use_font == FALSE) { |
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337 | $font_size = 5; |
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338 | $x = rand(2, $img_width / ($length / 3)); |
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339 | // y isnt used here |
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340 | } else { |
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341 | // Make font proportional to the image size |
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342 | $font_size = !empty($font_size) ? $font_size : mt_rand(18, 25); |
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0 ignored issues
–
show
The variable
$font_size seems only to be defined at a later point. As such the call to empty() seems to always evaluate to true .
This check marks calls to This is likely the result of code being shifted around. Consider removing these calls.
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343 | $x = rand(4, $img_width - (($font_size + ($font_size >> 1)) * $length)); |
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344 | // y isnt used here |
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345 | } |
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346 | $wordLen = strlen($word); |
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347 | for ($i = 0; $i < $wordLen; $i++) { |
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348 | if ($use_font == FALSE) { |
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349 | $y = rand(0, $img_height / 2); |
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350 | imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color); |
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351 | $x += ($font_size * 2); |
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352 | } else { |
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353 | $letter = substr($word, $i, 1); |
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354 | $less_rotate = [ |
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355 | 'c', |
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356 | 'N', |
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357 | 'U', |
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358 | 'Z', |
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359 | '7', |
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360 | '6', |
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361 | '9', |
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362 | ]; //letters that we don't want rotated too much... |
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363 | |||
364 | $angle = $skew == TRUE ? (in_array($letter, $less_rotate)) ? rand(-5, 5) : rand(-15, 15) : 0; |
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0 ignored issues
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365 | $y = $img_height / 2 + ($font_size >> 1) + ($skew == TRUE ? rand(-9, 9) : 0); |
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366 | $x += ($font_size >> 2); |
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367 | imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_file, $letter); |
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368 | $x += $font_size + ($font_size >> 2); |
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369 | } |
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370 | } |
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371 | |||
372 | // ----------------------------------- |
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373 | // Create the border |
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374 | // ----------------------------------- |
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375 | |||
376 | imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $border_color); |
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377 | |||
378 | // ----------------------------------- |
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379 | // Generate the image |
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380 | // ----------------------------------- |
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381 | |||
382 | $img_name = $now . '.png'; |
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383 | |||
384 | imagepng($im, $img_path . $img_name); |
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385 | |||
386 | $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\"$alt\" />"; |
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0 ignored issues
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387 | |||
388 | imagedestroy($im); |
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389 | |||
390 | return [ |
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391 | 'word' => $word, |
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392 | 'time' => $now, |
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393 | 'image' => $img, |
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394 | ]; |
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395 | } |
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396 | |||
397 | } |
This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.