PHP Kanji Verification Code

Code:

captcha.php

<?PHP//implement a simple verification code//session_startSession_Start();//Canvas$image= Imagecreatetruecolor (200, 60);//Set Fill Color$bgcolor= Imagecolorallocate ($image, 255, 255, 255);//FillImagefill ($image, 0, 0,$bgcolor);//Random Data$str= ' One is not in the people of this big in the last country I want him to be born to the land in the out on the right to be divided into a meeting can be the main year of the movement of workers can also under the son said the production of the noodles and after the side of the multi-line study law of the people of the 13 into the same Ministry of electricity, such as hydration high since the second, the reality of the increase in the amount of two systems when the point of employment to the sex good should open it together also because of some of the former outside the days of political 4th that social justice of the flat-shaped phase of the whole form and close each re-line within the number of positive heart against you see the original and the profit ratio or but the gas is the first way to life of this change strip only did not solve the idea of the establishment of the Moon, no army is the most emotional on behalf of the idea has been through and raised the five fruit of the party Cheng Wu position into the Tsunebumi total defective live set and pipe special pieces long for the old man base on the edge of the flow road level of less map to the group to see the view of her hand angle root on the farmers Means a few nine districts strong put west be dry do must fight first back then take the team south to the light door is moriharu North made hundred gauge hot collar seven Haikou East guide pressure zhi Shi Huijin contend with the Chi Ji oil thought of the pole of the joint what recognition six common right to receive the improvement of the beauty of the United States and the more single-wind cutting and white teaching speed flower belt Ann Body Car example real service with million per eye to reach the completion of the report of the sound of the class eight away from the Chinese name of the Zhang Xinma section of the session rice empty yuan condition this episode Wen Xu Guang Shi ji need Duan Yan Lin Law called and the study of the more weaving video calculation of the low-holding voice of the book Buzhong the inter-business non-inspection of the deep and difficult to close the mine thousand weeks of preparation of the semi-office of the Qing province, a sense of history the expensive city calendar of the Keho to acid and the elimination of the destruction of the house called too quasi-refined value of the family dimension of the standard mark to write in the hair-to-be-fast-effect of the hospital search river-type eye King according to the maintenance of easy to send a layer of film, but the special-shaped breeding plant jing yuan Bao Live full County Bureau according to red light to listen to the iron price strict ';//because in Utf-8, Chinese characters are 3 characters$cndb=Str_split($str, 3);//Session$captcha _code= ' '; for($i= 0;$i< 4;$i++) {    //Font Color    $fontcolor= Imagecolorallocate ($image,Mt_rand(0, 120),Mt_rand(0, 120),Mt_rand(0, 120)); //Array subscript    $index=Mt_rand(0,Count($cndb)); //storing Chinese characters    $font _CN=$cndb[$index]; //    $captcha _code.=$font _CN; //Font    $font= './FONT/MSYH.TTC '; //draw to CanvasImagettftext ($image,Mt_rand(16,20),Mt_rand( -60,60), (40*$i+20),Mt_rand(30,35),$fontcolor,$font,$font _CN);}//Save to session$_session[' authcode '] =$captcha _code;//interference//pixel points for($i= 0;$i< 200;$i++) {    $pixcolor= Imagecolorallocate ($image,Mt_rand(20, 200),Mt_rand(20, 200),Mt_rand(20, 200)); Imagesetpixel ($image,Mt_rand(0, 199),Mt_rand(0, 59),$pixcolor);}//Line for($i= 0;$i< 4;$i++) {    $linecolor= Imagecolorallocate ($image,Mt_rand(50, 220),Mt_rand(50, 220),Mt_rand(50, 220)); Imageline ($image,Mt_rand(0, 199),Mt_rand(0, 59),Mt_rand(0, 199),Mt_rand(0, 59),$linecolor);}//OutputHeader(' Content-type:image/png '); Imagepng ($image);//destroyedImagedestroy ($image);

form.php

<?PHPif(isset($_request[' Authcode '])) {    Session_Start(); //Judging    if(Strtolower($_request[' authcode '] = =Strtolower($_session[' Authcode ']))) {        Echo' Congratulations on your typing right! ‘; } Else {        Echo' Input failed! ‘; }    Exit();}?> for= "Authcode" > Please enter the contents of the Picture: </label> <input type= "text" name= "Authcode" id= "Authcode"/> </p> <p><input type= "Submit" value= "Submit"/></p></form></body>
PHP Kanji Verification Code