A PHP verification code generated class code

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 ($this->image); }else { Die ("PHP does not support image verification code"); } } Use this method to output an image to the browser function ShowImage ($fontFace = "") { Create an image background $this->createimage (); Setting interference elements $this->setdisturbcolor (); Randomly draw text into an image $this->outputtext ($fontFace); Output image $this->outputimage (); } function __destruct () { Imagedestroy ($this->image); } } function Checklogin () { if (Empty ($_post[' name ')) Die (' User name cannot be empty '); if (Empty ($_post[' password ')) Die ("Password cannot be empty"); if ($_session[' code ']!=$_post[' vertify ') Die ("The captcha is not entered correctly". $_session[' code '); $username =$_post[' name ']; $password =md5 ($_post[' password '); Check for Presence 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 ($result) >0) die ("Login Successful"); Else die ("User name or password error"); Mysql_close ($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 (); } ?> Copy Code

Verification Code, PHP

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