PHP Verification Code Generator Program code

PHP Verification code and generate a picture program, using the session recognition, slightly improved the current network of PHP verification code circulated, add miscellaneous points, digital color random display, control 4 digits display; Words are not much said, the procedure is as follows, share out.

New yz.php Authentication code generation file:

Note: The following code needs to open the GD Library of PHP, modify the configuration of the php.in file, the line has been commented out before the semicolon cancellation: Extension=php_gd2.dll.

The code is as follows

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<?php Class Validationcode { Property Private $width; Private $height; Private $codeNum; Private $image; Private $disturbColorNum; Number of interfering elements Private $checkCode; function __construct ($width =80, $height =20, $codeNum =4) { $this->width= $width; $this->height= $height; $this->codenum= $codeNum; $number =floor ($width * $height/15); if ($number >240-$codeNum) { $this->disturbcolornum=240-$codeNum; }else { $this->disturbcolornum= $number; } $this->checkcode= $this->createcheckcode (); } function Getcheckcode () { return $this->checkcode; } Private Function CreateImage () { $this->image=imagecreatetruecolor ($this->width, $this->height); $backcolor =imagecolorallocate ($this->image,rand (225,255), Rand (225,255), Rand (255,255)); Imagefill ($this->image,0,0, $backcolor); $border =imagecolorallocate ($this->image,0,0,0); Imagerectangle ($this->image,0,0, $this->width-1, $this->height-1, $border); } Private Function Setdisturbcolor () { For ($i =0 $i < $this->disturbcolornum; $i + +) { $color =imagecolorallocate ($this->image,rand (0,255), Rand (0,255), Rand (0,255)); Imagesetpixel ($this->image,rand (1, $this->width-2), rand (1, $this->height-2), $color); } For ($i =0 $i <10; $i + +) { $color =imagecolorallocate ($this->image,rand (0,255), Rand (0,255), Rand (0,255)); Imagearc ($this->image,rand ( -10, $this->width), rand ( -10, $this->height), rand (30,300), Rand (20,300), 55, 44, $color); } } Private Function outputtext ($fontFace = "") { For ($i =0 $i < $this->codenum; $i + +) { $fontcolor =imagecolorallocate ($this->image,rand (0,128), Rand (0,128), Rand (0,128)); if ($fontFace = = "") { $fontsize =rand (3,5); $x =floor ($this->width/$this->codenum) * $i +5; $y =rand (0, $this->height-15); Imagechar ($this->image, $fontsize, $x, $y, $this->checkcode{$i}, $fontcolor); } Else { $fontsize =rand (12,16); $x =floor (($this->width-8)/$this->codenum) * $i +8; $y =rand ($fontsize, $this->height-8); Imagettftext ($this->image, $fontsize, Rand ( -45,45), $x, $y, $fontcolor, $fontFace, $this->checkcode{$i}); } } } Private Function Createcheckcode () { $code = "23456789abcdefghijkmnpqrstuvwrst"; $str = ""; For ($i =0 $i < $this->codenum; $i + +) { $char = $code {rand (0,strlen ($code)-1)}; $str. = $char; } return $str; } Private Function Outputimage () { if (Imagetypes () &img_gif) { Header ("Content-type:image/gif"); Imagepng ($this->image); }else if (imagetypes () &img_jpg) { Header ("Content-type:image/jpeg"); Imagepng ($this->image); }else if (imagetypes () &img_png) { Header ("Content-type:image/png"); Imagepng ($this->image); }else if (imagetypes () &img_wbmp) { Header ("Content-type:image/vnd.wap.wbmp"); Imagepng ($this->image); }else { Die ("PHP does not support picture verification Code"); } } Output an image to the browser by this method function ShowImage ($fontFace = "") { Create an image background $this->createimage (); Set interference elements $this->setdisturbcolor (); Draw text randomly into an image $this->outputtext ($fontFace); Output image $this->outputimage (); } function __destruct () { Imagedestroy ($this->image); } } function Checklogin () { if (Empty ($_post[' name ')) Die (' username cannot be empty '); if (Empty ($_post[' password ')) Die ("Password cannot be blank"); if ($_session[' code ']!=$_post[' vertify ']) Die ("Validation code input is incorrect". $_session[' Code ')); $username =$_post[' name ']; $password =md5 ($_post[' password ')); Check to see if there is Conndb ($username, $password); } function conndb ($name = "", $ps = "") { $conn =mysql_connect (' localhost ', ' root ', ' 123456 '); if (! $conn) Die ("Database connection Failed". Mysql_error ()); mysql_select_db (' 5kan ', $conn) or Die (' Select Database Failed '. Mysql_error ()); Mysql_set_charset (' UTF8 ', $conn); $sql = "SELECT id from K_user where username= ' {$name} ' and password= ' {$ps} '"; $result =mysql_query ($sql) or Die ("SQL statement error". Mysql_error ()); if (mysql_num_rows ($result) >0) die ("Login succeeded"); Else die ("Username or password error"); Mysql_close ($conn); } Session_Start (); if (!isset ($_post[' randnum ')) { $code =new Validationcode (120,20,4); $code->showimage ("Comicbd.ttf"); Show on page $_session[' code ']= $code->getcheckcode ();//Save in Server } Else { Checklogin (); } ?>

To the specific call place, in such a form: on it, validation of the session:$_session[' Vcode ' value can be. You can also modify the above code slightly, and change it to two numbers to add and sum the form