Php Chinese and English verification code

// The English verification code is relatively simple. Do not perform hex processing. Simply use the color value and you will be OK. If
Session_start ();
Function rand_create ()
{
// Notify the browser that a PNG image will be output
Header ("Content-type: image/PNG ");
// Prepare the random number generator seeds
Srand (double) microtime () * 1000000 );
// Prepare image parameters
$ Im = imagecreate (62,22 );
$ Black = ImageColorAllocate ($ im, 0); // RGB black identifier
$ White = ImageColorAllocate ($ im, 255,255,255); // RGB white identifier
$ Gray = ImageColorAllocate ($ im, 200,200,200); // RGB gray identifier
// Start plotting
Imagefill ($ im, 0, 0, $ gray );
While ($ randval = rand () % 100000) <10000 );{
$ _ SESSION ["Auth_code"] = $ randval;
// Print the four-digit integer verification code into the image
Imagestring ($ im, 5, 10, 3, $ randval, $ black );
    }
// Add interference pixels
For ($ I = 0; I I <200; $ I ++ ){
$ Randcolor = ImageColorallocate ($ im, rand (0,255), rand (0,255), rand (0,255 ));
Imagesetpixel ($ im, rand () % 70, rand () % 30, $ randcolor );
    }
// Output verification image
ImagePNG ($ im );
// Destroy the image identifier
ImageDestroy ($ im );
}
Rand_create ();

// Call method

// The Chinese verification code program is as follows:

Header ("Content-type: image/PNG ");
$ Str = "here sets a Chinese text if the first Chinese WEB station is www.111cn.net ";
$ ImagesW = 140;
$ ImagesH = 40;
//
$ Auimg = imagecreate ($ imagesW, $ imagesH );
$ Bgc = ImageColorAllocate ($ Auimg, 255,255,255 );
$ Font = "heiti. ttf"; // set the font here. You can download any font.
$ White = imagecolorallocate ($ Auimg, 234,185, 95 );
Imagearc ($ Auimg, 150, 8, 20, 20, 75,170, $ white );
Imagearc ($ Auimg, 180, 75,175, 30, $ white );
Imageline ($ Auimg, 20, 20, 180,30, $ white );
Imageline ($ Auimg, 20, 18, 170,50, $ white );
Imageline ($ Auimg, 25, 50, 80, 50, $ white );
$ Noise_num = 800;
$ Line_num = 20;
Imagecolorallocate ($ Auimg, 0xff, 0xff, 0xff );
$ Rectangle_color = imagecolorallocate ($ Auimg, 0xAA, 0xAA, 0xAA );
$ Noise_color = imagecolorallocate ($ Auimg, 0x00,0x00,0x00 );
$ Font_color = imagecolorallocate ($ Auimg, 0x00,0x00,0x00 );
$ Line_color = imagecolorallocate ($ Auimg, 0x00,0x00,0x00 );
For ($ I = 0; $ I <$ noise_num; $ I ++ ){
Imagesetpixel ($ Auimg, mt_rand (0, $ imagesW), mt_rand (0, $ imagesH), $ noise_color );
}
For ($ I = 0; $ I <$ line_num; $ I ++ ){
Imageline ($ Auimg, mt_rand (0, $ imagesW), mt_rand (0, $ imagesH), mt_rand (0, $ imagesW), mt_rand (0, $ imagesH ), $ line_color );
}
$ MtRnd = rand (0, strlen ($ str)-4 );
If ($ mtRnd % 2) $ mtRnd + = 1;
$ Str = substr ($ str, $ mtRnd, 8 );
$ Str = iconv ("GB2312", "UTF-8", $ str );
ImageTTFText ($ Auimg, 20, 0, 16, 30, $ font_color, $ font, $ str );
ImagePNG ($ Auimg );
ImageDestroy ($ Auimg );
/*
In common, verification codes are stored by other containers, such as Sessions and cookies. Otherwise, verification is meaningless.
This article is composed of www.111cn.net. For more information, see the source. Thank you for your cooperation.