$ Ch_str = "You want to generate Chinese character verification code ";
$ Str = array ();
For ($ I = 0; $ I <strlen ($ ch_str); $ I + = 3)
{
$ Str [] = $ ch_str [$ I]. $ ch_str [$ I + 1]. $ ch_str [$ I + 2];
}
// The length and height of the image
$ Image_x = 200;
$ Image_y = 100;
$ Im = imagecreate ($ image_x, $ image_y );
// The background color of the image is white.
$ Bkg = imagecolorallocate ($ im, 255,255,255 );
// Display the font style. Put the file in the corresponding directory. If you do not have any file, find one in the font file of window.
$ Fnt = "simfang. ttf ";
// Assign some color to the image
$ White = imagecolorallocate ($ im, 234,185, 95 );
// Draw an elliptical arc on the image and specify the coordinate point
Imagearc ($ im, 150, 8, 20, 20, 75,170, $ white );
Imagearc ($ im, 180, 75,175, 30, $ white );
// Draw a line segment on the image and specify the coordinate point
Imageline ($ im, 20, 20, 180,30, $ white );
Imageline ($ im, 20, 18, 170,50, $ white );
Imageline ($ im, 25, 50, 80, 50, $ white );
// Number of random points
$ Noise_num = 3000;
$ Line_num = 80;
// Color of various chaotic characters
$ Rectangle_color = imagecolorallocate ($ im, 0xaa, 0xaa, 0xaa );
$ Noise_color = imagecolorallocate ($ im, 0x00,0x00,0x00 );
$ Font_color = imagecolorallocate ($ im, 0x00,0x00,0x00 );
For ($ I = 0; $ I <$ noise_num; $ I ++)
{
// Draw a single pixel on a coordinate point, which is defined above and is black.
Imagesetpixel ($ im, mt_rand (0, $ image_x), mt_rand (0, $ image_y), $ noise_color );
} For ($ I = 0; $ I <$ line_num; $ I ++)
{
$ Line_color = imagecolorallocate ($ im, mt_rand (0,255), mt_rand (0,255), mt_rand (0,255 ));
// Draw a line between two coordinate points, and the color is defined above
Imageline ($ im, mt_rand (0, $ image_x), mt_rand (0, $ image_y), mt_rand (0, $ image_x), mt_rand (0, $ image_y ), $ line_color );
}
$ Randnum = rand (0, count ($ str)-4 );
// The value is an even number.
If ($ randnum % 2)
{
$ Randnum + = 1;
}
$ Str1 = $ str [$ randnum]. $ str [$ randnum + 1];
For ($ I = 0; $ I <2; $ I ++)
{
Imagettftext ($ im, rand (28, 32), rand (0, 70), rand ($ image_x/4) * $ I + $ image_x/10, ($ image_x/4) * $ I + $ image_x/8), rand ($ image_y/2 + $ image_y/10, $ image_y/2 + $ image_y/5), $ font_color, $ fnt, $ str [$ randnum + $ I]);
}
Imagepng ($ im );
Imagedestroy ($ im ); // Generate Chinese verification code 2
$ Str = "Chinese characters ";
$ Image_x = 110;
$ Image_y = 110;
$ Im = imagecreate ($ image_x, $ image_y );
$ Bkg = imagecolorallocate ($ im, 255,255,255 );
$ Fnt = "hb. ttf"; // the font style displayed.
$ White = imagecolorallocate ($ im, 234,185, 95 );
Imagearc ($ im, 150, 8, 20, 20, 75,170, $ white );
Imagearc ($ im, 180, 75,175, 30, $ white );
Imageline ($ im, 20, 20, 180,30, $ white );
Imageline ($ im, 20, 18, 170,50, $ white );
Imageline ($ im, 25, 50, 80, 50, $ white );
$ Noise_num = 3000;
$ Line_num = 80;
Imagecolorallocate ($ im, 0xff, 0xff, 0xff );
$ Rectangle_color = imagecolorallocate ($ im, 0xaa, 0xaa, 0xaa );
$ Noise_color = imagecolorallocate ($ im, 0x00,0x00,0x00 );
$ Font_color = imagecolorallocate ($ im, 0x00,0x00,0x00 );
$ Line_color = imagecolorallocate ($ im, 0x00,0x00,0x00 );
For ($ I = 0; $ I <$ noise_num; $ I ++)
Imagesetpixel ($ im, mt_rand (0, $ image_x), mt_rand (0, $ image_y), $ noise_color );
For ($ I = 0; $ I <$ line_num; $ I ++)
Imageline ($ im, mt_rand (0, $ image_x), mt_rand (0, $ image_y), mt_rand (0, $ image_x), mt_rand (0, $ image_y ), $ line_color );
$ Randnum = rand (0, strlen ($ str)-4 );
If ($ randnum % 2) $ randnum + = 1;
$ Str1 = substr ($ str, $ randnum, 4 );
$ Str2 = iconv ("gb2312", "UTF-8", $ str1); // verify that Chinese characters are in $ str1 Imagettftext ($ im, rand (28, 32), rand (70,100), rand (25, 27), rand (), $ font_color, $ fnt, $ str2 );
Imagepng ($ im );
Imagedestroy ($ im ); // Place Chinese characters in an array
/*
The gd function only accepts UTF-8 encoded text. Therefore, encode and convert the text before writing it. Php's built-in iconv and mbstring libraries can do this.
*/ $ Randcode = array ('pet ');
$ Codetable = array ();
$ Fp = fopen ("gb2312.txt", "r ");
While ($ line = fgets ($ fp ))
$ Codetable [hexdec (substr ($ line,)] = substr ($ line );
Fclose ($ fp ); // Convert gb2312 to utf8
Function gb2utf8 ($ gbstr)
{
Global $ codetable;
If (trim ($ gbstr) = "")
Return $ gbstr;
$ Ret = "";
$ Utf8 = "";
While ($ gbstr)
{
If (ord (substr ($ gbstr, 127)>)
{
$ Thisw = substr ($ gbstr, 0, 2 );
$ Gbstr = substr ($ gbstr, 2, strlen ($ gbstr ));
$ Utf8 = "";
@ $ Utf8 = u2utf8 (hexdec ($ codetable [hexdec (bin2hex ($ thisw)-0x8080]); If ($ utf8! = "")
For ($ I = 0; $ I <strlen ($ utf8); $ I + = 3)
$ Ret. = chr (substr ($ utf8, $ I, 3 ));
}
Else
{
$ Ret. = substr ($ gbstr, 0, 1 );
$ Gbstr = substr ($ gbstr, 1, strlen ($ gbstr ));
}
}
Return $ ret;
}
// Unicode to utf8
Function u2utf8 ($ c)
{
$ Str = "";
If ($ c <0x80)
$ Str. = $ c;
Elseif ($ c <0x800)
{
$ Str. = (0xc0 | $ c> 6 );
$ Str. = (0x80 | $ c & 0x3f );
}
Elseif ($ c <0x10000)
{
$ Str. = (0xe0 | $ c> 12 );
$ Str. = (0x80 | $ c> 6 & 0x3f );
$ Str. = (0x80 | $ c & 0x3f );
}
Elseif ($ c <0x200000)
{
$ Str. = (0xf0 | $ c> 18 );
$ Str. = (0x80 | $ c> 12 & 0x3f ); $ Str. = (0x80 | $ c> 6 & 0x3f );
$ Str. = (0x80 | $ c & 0x3f );
}
Return $ str;
} // Generate an additional code
Function create_excode ($ length)
{
Global $ randcode;
Header ("content-type: image/png ");
$ Image_x = $ length * 30; // image width
$ Image_y = 40; // Image height
$ Noise_num = 80 * $ length; // number of vertices
$ Line_num = $ length-2; // Number of interference lines
$ Image = imagecreate ($ image_x, $ image_y );
Imagecolorallocate ($ image, 0xff, 0xff, 0xff); // you can specify the background color.
$ Rectangle_color = imagecolorallocate ($ image, 0xaa, 0xaa, 0xaa); // border color
$ Noise_color = imagecolorallocate ($ image, 0 x, 0 x); // Miscellaneous color
$ Font_color = imagecolorallocate ($ image, 0x00,0x00,0x00); // font color
$ Line_color = imagecolorallocate ($ image, 0x33,0x33,0x33); // interference line color // Add the Miscellaneous
For ($ I = 0; $ I <$ noise_num; $ I ++)
Imagesetpixel ($ image, mt_rand (0, $ image_x), mt_rand (0, $ image_y), $ noise_color ); $ Font_face = "simkai. ttf"; // font
$ X = 2;
$ Session_code = '';
For ($ I = 0; $ I <$ length; $ I ++)
{
$ Code = $ randcode [mt_rand (0, count ($ randcode)-1)];
Imagettftext ($ image, 18, mt_rand (-6, 6), $ x, 29, $ font_color, $ font_face, gb2utf8 ($ code ));
$ X + = 30;
$ Session_code. = $ code;
}
@ Session_start ();
$ _ Session ['excode'] = $ session_code; // put the value of the additional code in the session
// Add interference lines
For ($ I = 0; $ I <$ line_num; $ I ++)
Imageline ($ image, mt_rand (0, $ image_x), mt_rand (0, $ image_y ),
Mt_rand (0, $ image_x), mt_rand (0, $ image_y), $ line_color );
Imagerectangle ($ image, $ image_x-1, $ image_y-1, $ rectangle_color); // add a border
Imagepng ($ image );
Imagedestroy ($ image );
}
Create_excode (6 ); |
