|
Class Code {
// 1. define the width, height, canvas, word count, type, and painting type of each member.
Private $ width; // width
Private $ height; // height
Private $ num; // Number of characters in the verification code
Private $ imgType; // type of the generated image
Private $ Type; // string Type: 1, 2, 3, three options: 1, numbers, 2, lowercase letters, 3, uppercase, lowercase letters, and numbers
Private $ hb; // canvas
Public $ codestr; // verification code string
Public function _ construct ($ height = 20, $ num = 4, $ imgType = "jpeg", $ Type = 1 ){
$ This-> width = $ num * 20;
$ This-> height = $ height;
$ This-> num = $ num;
$ This-> imgType = $ imgType;
$ This-> Type = $ Type;
$ This-> codestr = $ this-> codestr ();
$ This-> zuhe ();
}
// 2. define a random string function
Private function codestr (){
Switch ($ this-> Type ){
Case 1: // type 1 to obtain a random number from 1 to 9
$ Str = implode ("", array_rand (range (0, 9), $ this-> num ));
Break;
Case 2: // type 2 get a-z random lowercase letter
$ Str = implode ("", array_rand (array_flip (range (a, z), $ this-> num ));
Break;
Case 3: // Type 3: numbers, lowercase letters, and uppercase letters
For ($ I = 0; $ I <$ this-> num; $ I ++ ){
$ M = rand (0, 2 );
Switch ($ m ){
Case 0:
$ O = rand (48, 57 );
Break;
Case 1:
$ O = rand (65,90 );
Break;
Case 2:
$ O = revert (97,122 );
Break;
}
$ Str. = sprintf ("% c", $ o );
}
Break;
}
Return $ str;
}
// 3. initialize canvas image resources
Private function Hb (){
$ This-> hb = imagecreatetruecolor ($ this-> width, $ this-> height );
}
// 4. Generate the background color
Private function Bg (){
Return imagecolorallocate ($ this-> hb, rand (130,250), rand (130,250), rand (130,250 ));
}
// 5. Generate the font color
Private function Font (){
Return imagecolorallocate ($ this-> hb, rand (0,100), rand (0,100), rand (0,100 ));
}
// 6. fill in the background color
Private function BgColor (){
Imagefilledrectangle ($ this-> hb, 0, $ this-> width, $ this-> height, $ this-> Bg ());
}
// 7. Interference point
Private function ganrao (){
$ Sum = floor ($ this-> width) * ($ this-> height)/3 );
For ($ I = 0; $ I <$ sum; $ I ++ ){
Imagesetpixel ($ this-> hb, rand (0, $ this-> width), rand (0, $ this-> height), $ this-> Bg ());
}
}
// 8. Random line arc
Private function huxian (){
For ($ I = 0; $ I <$ this-> num; $ I ++ ){
ImageArc ($ this-> hb, rand (0, $ this-> width), rand (0, $ this-> height), rand (0, $ this-> width), rand (0, $ this-> height), rand (0,360), rand (0,360), $ this-> Bg ());
}
}
// 9. write
Private function xiezi (){
For ($ I = 0; $ I <$ this-> num; $ I ++ ){
$ X = ceil ($ this-> width/$ this-> num) * $ I;
$ Y = rand (1, $ this-> height-15 );
Imagechar ($ this-> hb, 5, $ x + 4, $ y, $ this-> codestr [$ I], $ this-> Font ());
}
}
// 10. output
Private function OutImg (){
$ Shuchu = "image". $ this-> imgType;
$ Header = "Content-type: image/". $ this-> imgType;
If (function_exists ($ shuchu )){
Header ($ header );
$ Shuchu ($ this-> hb );
} Else {
Exit ("GD library does not have such images ");
}
}
// 11. Assemble
Private function zuhe (){
$ This-> Hb ();
$ This-> BgColor ();
$ This-> ganrao ();
$ This-> huxian ();
$ This-> xiezi ();
$ This-> OutImg ();
}
Public function getCodeStr (){
Return $ this-> codestr;
}
}
?> |
