Php simple verification code

& Amp; lt ;! -- * @ Copyright (c) 2011 * @ author: Ernest * @ time: 2011 * @ version: new -- & amp; gt; & amp; lt ;? PhpclassVerifyImg {public $ fontSize15; defines the font size public $ length4; defines the string length...

Class VerifyImg {

Public $ fontSize = 15; // defines the font size.

Public $ length = 4; // define the string length

Public $ width = 70; // defines the image width.

Public $ height = 30; // define the image height

Public $ im = null; // generate an image with the specified width and height

Public $ font = 'C:/Windows/Fonts/Arial. ttf ';

Public $ strNum = "";

Public function Build (){

$ Strings = Array ('1', '2', '3', '4', '5', '6', '7', 'A ', 'B', 'C', 'D', 'e', 'F', 'H', 'I', 'J', 'K', 'M ', 'N', 'P', 'R','s ', 'T', 'u', 'V', 'W', 'X ', 'Y ');

// $ StrNum = "";

$ Count = count ($ strings );

For ($ I = 1; $ I <= $ this-> length; $ I ++) {// generate a string using random characters in a loop

$ StrNum. = $ strings [rand (0, $ count-1)];

}

Session_start ();

$ _ SESSION ["verifycode"] = $ strNum;

$ This-> im = imagecreate ($ this-> width, $ this-> height );

$ Backgroundcolor = imagecolorallocate ($ this-> im, 255,255,255); // generates the background color.

$ FrameColor = imageColorAllocate ($ this-> im, 0,255, 0 );

For ($ I = 0; $ I <$ this-> length; $ I ++ ){

$ CharY = ($ this-> height + 9)/2 + rand (-1, 1); // define the Y coordinate of the character

$ CharX = $ I * 15 + 8; // defines the X coordinate of the character

// $ Text_color = imagecolorallocate ($ this-> im, 255, 0, 0); // Generate character color

$ Text_color = imagecolorallocate ($ this-> im, mt_rand (50,255), mt_rand (50,128), mt_rand (50,200 ));

$ Angle = rand (-20, 20); // Generate the character angle

// Write characters

Imagettftext ($ this-> im, $ this-> fontSize, $ angle, $ charX, $ charY, $ text_color, $ this-> font, $ strNum [$ I]);

}

For ($ I = 0; $ I <= 5; $ I ++) {// draws the background line cyclically.

$ Linecolor = imagecolorallocate ($ this-> im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));

$ Linex = mt_rand (1, $ this-> width-1 );

$ Liney = mt_rand (1, $ this-> height-1 );

Imageline ($ this-> im, $ linex, $ liney, $ linex + mt_rand (0, 4)-2, $ liney + mt_rand (0, 4)-2, $ linecolor );

}

For ($ I = 0; $ I <= 32; $ I ++) {// draws the background point cyclically to generate the pitting effect.

$ Pointcolor = imagecolorallocate ($ this-> im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));

Imagesetpixel ($ this-> im, mt_rand (1, $ this-> width-1), mt_rand (1, $ this-> height-1), $ pointcolor );

}

Imagerectangle ($ this-> im, 0, 0, $ this-> width-1, $ this-> height-1, $ frameColor); // draw a border

Ob_clean ();

Header ('content-type: image/png ');

Imagepng ($ this-> im );

Imagedestroy ($ this-> im );

}

}

$ Img = new VerifyImg ();

$ Img-> Build ();

?>