PHP verification code and php Verification Code

PHP verification code and php Verification Code

Design a verification code class that can be called at any time as needed

Verification Code class, saved as ValidateCode. class. php

1 <? Php 2 // Verification code class 3 session_start (); 4 class ValidateCode {5 private $ charset = 'abcdefghkmnprstuvwxyzabcdefghkmnprstuvwxyz23456789 '; // random factor 6 private $ code; // Verification Code 7 private $ codelen = 4; // verification code length 8 private $ width = 130; // width 9 private $ height = 50; // height 10 private $ img; // graphic resource handle 11 private $ font; // The specified font 12 private $ fontsize = 20; // specify the font size 13 private $ fontcolor; // specify the font color 14 // constructor initializes 15 public function _ construct () {16 $ this-> font = '. /latha. ttf'; // note that the font path must be correct; otherwise, the image cannot be displayed 17} 18 // generate random Code 19 private function createCode () {20 $ _ len = strlen ($ this-> charset)-1; 21 for ($ I = 0; $ I <$ this-> codelen; $ I ++) {22 $ this-> code. = $ this-> charset [mt_rand (0, $ _ len)]; 23} 24} 25 // generate background 26 private function createBg () {27 $ this-> img = imagecreatetruecolor ($ this-> width, $ this-> height); 28 $ color = imagecolorallocate ($ this-> img, mt_rand (157,255 ), mt_rand (157,255), mt_rand (157,255); 29 imagefilledrectangle ($ this-> img, 0, $ this-> height, $ this-> width, 0, $ color ); 30} 31 // generate the text 32 private function createFont () {33 $ _ x = $ this-> width/$ this-> codelen; 34 for ($ I = 0; $ I <$ this-> codelen; $ I ++) {35 $ this-> fontcolor = imagecolorallocate ($ this-> img, mt_rand (0,156), mt_rand (0,156 ), mt_rand (0,156); 36 imagettftext ($ this-> img, $ this-> fontsize, mt_rand (-30,30), $ _ x * $ I + mt_rand ), $ this-> height/1.4, $ this-> fontcolor, $ this-> font, $ this-> code [$ I]); 37} 38} 39 // generate line, snowflake 40 private function createLine () {41 // line 42 for ($ I = 0; $ I <6; $ I ++) {43 $ color = imagecolorallocate ($ this-> img, mt_rand (0,156), mt_rand (0,156), mt_rand (0,156); 44 imageline ($ this-> img, mt_rand (0, $ this-> width), mt_rand (0, $ this-> height), mt_rand (0, $ this-> width), mt_rand (0, $ this-> height), $ color); 45} 46 // snowflake 47 for ($ I = 0; $ I <100; $ I ++) {48 $ color = imagecolorallocate ($ this-> img, mt_rand (200,255), mt_rand (200,255), mt_rand (200,255); 49 imagestring ($ this-> img, mt_rand (1, 5), mt_rand (0, $ this-> width), mt_rand (0, $ this-> height), '*', $ color ); 50} 51} 52 // outPut 53 private function outPut () {54 header ('content-type: image/png '); 55 imagepng ($ this-> img ); 56 imagedestroy ($ this-> img); 57} 58 // generate 59 public function doimg () {60 $ this-> createBg (); 61 $ this-> createCode (); 62 $ this-> createLine (); 63 $ this-> createFont (); 64 $ this-> outPut (); 65} 66 // get the verification code 67 public function getCode () {68 return strtolower ($ this-> code); 69} 70}

Note: In row 16th, you must modify the font path. Otherwise, the font image cannot be displayed.

Implementation, save as captcha. php

1 session_start (); 2 require './ValidateCode. class. php'; // first include the class, and modify the actual path according to the actual situation. 3 $ _ vc = new ValidateCode (); // instantiate an object 4 $ _ vc-> doimg (); 5 $ _ SESSION ['authnum _ session'] = $ _ vc-> getCode (); // The verification code is saved to the session.

Page usage

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Reposted from: a beautiful php Verification Code Class (SHARE)