PHP custom size verification code _ PHP Tutorial-php Tutorial

PHP custom size verification code. Copy the code as follows :? PhpfunctionvCode ($ num4, $ size20, $ width0, $ height0 ){! $ Width $ num * $ size * 45 + 5 ;! $ Height $ size + 10; $ str with 01Ol removed The code is as follows:

Function vCode ($ num = 4, $ size = 20, $ width = 0, $ height = 0 ){
! $ Width & amp; $ width = $ num * $ size * 4/5 + 5;
! $ Height & $ height = $ size + 10;
// Remove 0 1 O l and so on
$ Str= "23456789 abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVW ";
$ Code = '';
For ($ I = 0; $ I <$ num; $ I ++ ){
$ Code. = $ str [mt_rand (0, strlen ($ str)-1)];
}
// Draw an image
$ Im = imagecreatetruecolor ($ width, $ height );
// Define the color to be used
$ Back_color = imagecolorallocate ($ im, 235,236,237 );
$ Boer_color = imagecolorallocate ($ im, 118,151,199 );
$ Text_color = imagecolorallocate ($ im, mt_rand (0,200), mt_rand (0,120), mt_rand (0,120 ));

// Draw the background
Imagefilledrectangle ($ im, 0, 0, $ width, $ height, $ back_color );
// Draw a border
Imagerectangle ($ im, 0, 0, $ width-1, $ height-1, $ boer_color );
// Draw interference lines
For ($ I = 0; $ I <5; $ I ++ ){
$ Font_color = imagecolorallocate ($ im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));
Imagearc ($ im, mt_rand (-$ width, $ width), mt_rand (-$ height, $ height), mt_rand (30, $ width * 2), mt_rand (20, $ height * 2), mt_rand (0,360), mt_rand (0,360), $ font_color );
}
// Draw interference points
For ($ I = 0; $ I <50; $ I ++ ){
$ Font_color = imagecolorallocate ($ im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));
Imagesetpixel ($ im, mt_rand (0, $ width), mt_rand (0, $ height), $ font_color );
}
// Draw the verification code
@ Imagefttext ($ im, $ size, 0, 5, $ size + 3, $ text_color, 'C: // WINDOWS // Fonts // simsun. ttc ', $ code );
Header ("Cache-Control: max-age = 1, s-maxage = 1, no-cache, must-revalidate ");
Header ("Content-type: image/png ");
Imagepng ($ im );
Imagedestroy ($ im );
}
?>

Function description and example:
// 4 characters, 20 characters
VCode (4, 20 );
?>

The http://www.bkjia.com/PHPjc/327500.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/327500.htmlTechArticle code is as follows :? Php function vCode ($ num = 4, $ size = 20, $ width = 0, $ height = 0 ){! $ Width = $ num * $ size * 4/5 + 5 ;! $ Height = $ size + 10; // remove the $ str...