PHP verification code (latest modification, fully customized !) _ PHP Tutorial

PHP verification code (latest modification, fully customized !). The copy code for downloading Authnum. class. php is as follows :? Phpsession_start (); classAuthnum {image object, width, height, verification code length private $ im; private $ im_width; private Authnum. class. php download

The code is as follows:

Session_start ();
Class Authnum {
// Image object, width, height, and verification code length
Private $ im;
Private $ im_width;
Private $ im_height;
Private $ len;
// Random string, Y axis coordinate value, and random color
Private $ randnum;
Private $ y;
Private $ randcolor;
// The red, green, and blue background color. the default value is light gray.
Public $ red= 238;
Public $ green = 238;
Public $ blue = 238;
/**
* Optional settings: verification code type, interference point, interference line, and y-axis random
* If it is set to false, this parameter is disabled.
**/
// The default value is a combination of upper and lower case numbers. the value 1 2 3 indicates lower case, upper case, and number type respectively.
Public $ ext_num_type = '';
Public $ ext_pixel = false; // interference point
Public $ ext_line = false; // interference line
Public $ ext_rand_y = true; // random Y axis
Function _ construct ($ len = 4, $ im_width = '', $ im_height = 25 ){
// The verification code length, image width, and height are required for class instantiation.
$ This-> len = $ len; $ im_width = $ len * 15;
$ This-> im_width = $ im_width;
$ This-> im_height = $ im_height;
$ This-> im = imagecreate ($ im_width, $ im_height );
}
// Set the background color of the image. the default value is light gray.
Function set_bgcolor (){
Imagecolorallocate ($ this-> im, $ this-> red, $ this-> green, $ this-> blue );
}
// Obtain random digits
Function get_randnum (){
$ An1 = 'abcdefghijklmnopqrstuvwxy ';
$ An2 = 'abcdefghijklmnopqrstuvwxy ';
$ An3 = '20140901 ';
If ($ this-> ext_num_type = '') $ str = $ an1. $ an2. $ an3;
If ($ this-> ext_num_type = 1) $ str = $ an1;
If ($ this-> ext_num_type = 2) $ str = $ an2;
If ($ this-> ext_num_type = 3) $ str = $ an3;
For ($ I = 0; $ I <$ this-> len; $ I ++ ){
$ Start = rand (1, strlen ($ str)-1 );
$ Randnum. = substr ($ str, $ start, 1 );
}
$ This-> randnum = $ randnum;
$ _ SESSION [an] = $ this-> randnum;
}
// Obtain the verification code Image Y axis
Function get_y (){
If ($ this-> ext_rand_y) $ this-> y = rand (5, $ this-> im_height/5 );
Else $ this-> y = $ this-> im_height/4;
}
// Obtain random colors
Function get_randcolor (){
$ This-> randcolor = imagecolorallocate ($ this-> im, rand (0,100), rand (0,150), rand (0,200 ));
}
// Add interference points
Function set_ext_pixel (){
If ($ this-> ext_pixel ){
For ($ I = 0; I I <100; $ I ++ ){
$ This-> get_randcolor ();
Imagesetpixel ($ this-> im, rand () % 100, rand () % 100, $ this-> randcolor );
}
}
}
// Add interference lines
Function set_ext_line (){
If ($ this-> ext_line ){
For ($ j = 0; $ j <2; $ j ++ ){
$ Rand_x = rand (2, $ this-> im_width );
$ Rand_y = rand (2, $ this-> im_height );
$ Rand_x2 = rand (2, $ this-> im_width );
$ Rand_y2 = rand (2, $ this-> im_height );
$ This-> get_randcolor ();
Imageline ($ this-> im, $ rand_x, $ rand_y, $ rand_x2, $ rand_y2, $ this-> randcolor );
}
}
}
/** Create a verification code Image:
* Create a canvas (_ construct function)
* Set the canvas background ($ this-> set_bgcolor ();)
* Obtain a random string ($ this-> get_randnum ();)
* Writing text to an image (imagestring function)
* Add interference points/lines ($ this-> set_ext_line (); $ this-> set_ext_pixel ();)
* Output image
**/
Function create (){
$ This-> set_bgcolor ();
$ This-> get_randnum ();
For ($ I = 0; $ I <$ this-> len; $ I ++ ){
$ Font = rand (4, 6 );
$ X = $ I/$ this-> len * $ this-> im_width + rand (1, $ this-> len );
$ This-> get_y ();
$ This-> get_randcolor ();
Imagestring ($ this-> im, $ font, $ x, $ this-> y, substr ($ this-> randnum, $ I, 1 ), $ this-> randcolor );
}
$ This-> set_ext_line ();
$ This-> set_ext_pixel ();
Header ("content-type: image/png ");
Imagepng ($ this-> im );
Imagedestroy ($ this-> im); // release image resources
}
} // End class
/** Methods for using the verification code class:
* $ An = new Authnum (verification code length, image width, and image height );
* If the parameter is not included in the instantiation, the default value is a four-digit 60*25-size regular verification code image.
* Check the verification code on the form page. compare whether $ _ SESSION [an] is equal to $ _ POST [verification code text box ID].
* Optional configuration:
* 1. verification code type: $ an-> ext_num_type = 1. the value 1 indicates lower case, 2 indicates upper case, and 3 Indicates number.
* 2. Interference point: $ an-> ext_pixel = false; a value of false indicates no interference point is added.
* 3. Interference line: $ an-> ext_line = false; false indicates no interference line is added.
* 4. y-axis random: $ an-> ext_rand_y = false; if the value is false, y-axis random is not supported.
* 5. image background: change the value of the three member variables $ red $ green $ blue.
**/
$ An = new Authnum ();
$ An-> ext_num_type = '';
$ An-> ext_pixel = true; // interference point
$ An-> ext_line = false; // interference line
$ An-> ext_rand_y = true; // random Y axis
$ An-> green = 238;
$ An-> create ();
?>

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