Computing verification code and Thinkphp3.2 Verification Code

Computing verification code and Thinkphp3.2 Verification Code

Do you think that common verification codes cannot be met? Next we will introduce how to change the existing tp verification codes to computation verification codes:

First, find ThinkPHP \ Library \ Think \ Verify. class. php.

Add the following code:

1 public function entry_add ($ id = '') {2 $ this-> length = '3'; 3 // picture width (px) 4 $ this-> imageW | $ this-> imageW =$ this-> length * $ this-> fontSize * 1.5 + $ this-> length * $ this-> fontSize/ 2; 5 // picture height (px) 6 $ this-> imageH | $ this-> imageH = $ this-> fontSize * 2.5; 7 // create an image $ this-> imageW x $ this-> imageH image 8 $ this-> _ image = imagecreate ($ this-> imageW, $ this-> imageH); 9 // Set background 10 imagecolorallocate ($ this-> _ image, $ This-> bg [0], $ this-> bg [1], $ this-> bg [2]); 11 12 // random font color of the Verification Code 13 $ this-> _ color = imagecolorallocate ($ this-> _ image, mt_rand (1,150), mt_rand (1,150 ), mt_rand (1,150); 14 // The Verification Code uses a random font of 15 $ ttfPath = dirname (_ FILE __). '/Verify /'. ($ this-> useZh? 'Zhttfs': 'ttfs '). '/'; 16 17 if (empty ($ this-> fontttf) {18 $ dir = dir ($ ttfPath); 19 $ ttfs = array (); 20 while (false! ==( $ File = $ dir-> read () {21 if ($ file [0]! = '. '& Substr ($ file,-4) = '. ttf') {22 $ ttfs [] = $ file; 23} 24} 25 $ dir-> close (); 26 $ this-> fontttf = $ ttfs [array_rand ($ ttfs)]; 27} 28 $ this-> fontttf = $ ttfPath. $ this-> fontttf; 29 30 if ($ this-> useImgBg) {31 $ this-> _ background (); 32} 33 34 if ($ this-> useNoise) {35 // 36 36 $ this-> _ writeNoise (); 37} 38 if ($ this-> useCurve) {39 // painted interference line 40 $ this-> _ writeCurve (); 41} 42 43 // painted Verification code 44 $ code = array (); // verification code 45 $ symbol = array ('+', '-'); 46 $ codeNX = 0; // The left margin of the N character of the verification code is 47 $ now_symbol = $ symbol [rand (0, 1)]; 48 for ($ I = 0; $ I <$ this-> length; $ I ++) {49 if ($ I = 1) {50 $ code [$ I] = $ now_symbol; 51 $ codeNX + = mt_rand ($ this-> fontSize * 1.2, $ this-> fontSize * 1.6); 52 imagettftext ($ this-> _ image, $ this-> fontSize, 0, $ codeNX, $ this-> fontSize * 1.6, $ this-> _ color, $ ttfPath. '2. ttf', $ code [$ I]); 53} 54 else {55 $ code [$ I] = $ this-> codeSet [mt_rand (0, strlen ($ this-> codeSet)-1)]; 56 $ codeNX + = mt_rand ($ this-> fontSize * 1.2, $ this-> fontSize * 1.6 ); 57 imagettftext ($ this-> _ image, $ this-> fontSize, mt_rand (-40, 40), $ codeNX, $ this-> fontSize * 1.6, $ this-> _ color, $ this-> fontttf, $ code [$ I]); 58} 59} 60 61 // Save the verification code 62 $ key = $ this-> authcode ($ this-> seKey); 63 $ str = implode ('', $ code ); 64 eval ("\ $ re = $ str;"); 65 $ code = $ this-> authcode ($ re); 66 $ secode = array (); 67 $ secode ['verify _ Code'] = $ code; // Save the verification code to session68 $ secode ['verify _ time'] = NOW_TIME; // verification code creation time 69 session ($ key. $ id, $ secode); 70 71 header ('cache-Control: private, max-age = 0, no-store, no-Cache, must-revalidate '); 72 header ('cache-Control: post-check = 0, pre-check = 0', false); 73 header ('pragma: no-cache '); 74 header ("content-type: image/png"); 75 76 // output image 77 imagepng ($ this-> _ image ); 78 imagedestroy ($ this-> _ image); 79}

1 public function check_add ($ code, $ id = '') {2 $ key = $ this-> authcode ($ this-> seKey ). $ id; 3 // The Verification code cannot be blank. 4 $ secode = session ($ key); 5 if ($ code = false | empty ($ secode )) {6 return false; 7} 8 // whether the verification code is a number 9 if (! Is_numeric ($ code) {10 return false; 11} 12 // session expiration 13 if (NOW_TIME-$ secode ['verify _ time']> $ this-> expire) {14 session ($ key, null); 15 return false; 16} 17 if ($ this-> authcode ($ code) = $ secode ['verify _ Code']) {18 $ this-> reset & session ($ key, null); 19 return true; 20} 21 return false; 22}

Generation Method:

1 Public function verify(){2         import('ORG.Util.Verify');3         $Verify = new Verify();4         $Verify->useNoise = true;5         $Verify->codeSet = '0123456789';6         $Verify->useCurve = false;7         $Verify->entry_add();8     }

Verification Method:

1 if (! Check_verify ($ verify, '', 'add') {2 $ this-> error ('verification code error! '); 3 return; 4}

Public method called:

1 // check whether the entered verification code is correct. $ code is the user-entered verification code string 2 function check_verify ($ code, $ id = '', $ type = '') {3 import ('org. util. verify '); 4 $ verify = new Verify (); 5 if ($ type = 'add') {6 return $ verify-> check_add ($ code, $ id ); 7} 8 else {9 return $ verify-> check ($ code, $ id); 10} 11}

Complete, you can make full use of your imagination to improve.

Question: Do you really need to click the verification code of the inverted text on zhihu? If you are interested, you can check it out.