A very useful verification code tool class

<无详细内容> /** * Verification Code Class */ Class base_tool_verify{ /** * Generate Verification Code method */ public static function Createcode () { Generate a Captcha picture Full Digital $str = "D,b,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,w,j,k,m,m,n,k,p,q,r,s,t,u,v,w,x,y,z"; To display the characters, you can make additions and deletions $list = Explode (",", $str); $cmax = count ($list)-1; $verifyCode = "; for ($i =0; $i < 4; $i + +) { $randnum = Mt_rand (0, $cmax); $verifyCode. = $list [$randnum]; Take out the characters and combine them into the captcha characters we want. } $_session[' Code ' = $verifyCode; Put characters in session $im = Imagecreate (80,28); Create a picture $black = imagecolorallocate ($im, 0, 0, 0); This bar and the following three are set for the color $white = Imagecolorallocate ($im, 244,249,244); $gray = Imagecolorallocate ($im, Rand (200,255), Rand (200,255), Rand (200,255)); $red = Imagecolorallocate ($im, Rand (200,255), Rand (200,255), Rand (200,255)); $rand _color = Imagecolorallocate ($im, Rand (0,255), Rand (0,255), Rand (0,255)); $rand _color2 = Imagecolorallocate ($im, Rand (0,255), Rand (0,255), Rand (0,255)); Imagefill ($im, 0,0, $white); Fill a picture with color $pix =imagecolorallocate ($im, Rand (0,255), Rand (0,255), Rand (0,255)); Mt_srand (); for ($i =0; $i <100; $i + +) { Imagesetpixel ($im, Mt_rand (0,180), Mt_rand (0,35), $pix); } Imageline ($im, 0,rand (0,28), N, Rand (0,28), $rand _color); Imageline ($im, 0,rand (0,28), N, Rand (0,28), $rand _color2); Draw a verification code into a picture $mycolor = imagecolorallocate ($im, 0, 78, 152); $path = Api_path. DS. ' Base '. DS. ' Tool '; Putenv (' gdfontpath= '. $path); $font = ' Simhei.ttf '; $arrstr = Str_split ($verifyCode); Imagettftext ($im, 0,50, Rand (20,30), $mycolor, $font, $arrstr [0]); Imagettftext ($im, 0,50, Rand (20,30), $mycolor, $font, $arrstr [1]); Imagettftext ($im, 0,50, Rand (20,30), $mycolor, $font, $arrstr [2]); Imagettftext ($im, Max, Rand (0,50), Max, Rand (20,30), $mycolor, $font, $arrstr [3]); $font 2=imagecolorallocate ($im, 41,163,238); Imagerectangle ($im, 0,0,1,1, $font 2); Imagepng ($im); Imagedestroy ($im); } } Copy Code

