In the actual project development often encounter verification code problems, such as landing page, Message page, registration page ...
The principle of verification code is very simple: the use of the GD library to create a picture, the image of course to add the necessary interference code, and then in the server-side deposit session, and so on when the user submits to determine whether the session is the same.
Today's shared PHP verification code class, support Chinese characters, alphanumeric, but also can customize the font file, already enough for everyone to use
Copy to ClipboardWhat to refer to: [www.bkjia.com] /*
* Captcha Class base on PHP GD Lib
* @author Design
* @version 1.0
* @copyright js8.in 2010
* @demo
* Include (' captchaclass.php ');
* $captchaDemo =new Captcha ();
* $captchaDemo->createimage ();
*/
Class captcha{
@ Define CAPTCHA Picture height
Private $height;
@ Define CAPTCHA Picture width
Private $width;
@ Defines the number of Captcha characters
Private $textNum;
@ Define CAPTCHA character content
Private $textContent;
@ Define character Color
Private $fontColor;
@ Defines the randomly-out text color
Private $randFontColor;
@ Define Font Size
Private $fontSize;
@ Define Font
Private $fontFamily;
@ Define Background color
Private $bgColor;
@ Define a randomly-out background color
Private $randBgColor;
@ Define Character language
Private $textLang;
@ Define number of interference points
Private $noisePoint;
@ Define number of interference lines
Private $noiseLine;
@ defines whether to distort
Private $distortion;
@ Define distort picture source
Private $distortionImage;
@ Defines if there is a border
Private $showBorder;
@ Define CAPTCHA Picture Source
Private $image;
@Constructor Constructors
Public Function Captcha () {
$this->textnum=4;
$this->fontsize=16;
$this->fontfamily= ' C:\\windows\\fonts\simyou.ttf ';//set Chinese font, can be changed to Linux directory
$this->textlang= ' en ';
$this->noisepoint=30;
$this->noiseline=3;
$this->distortion=false;
$this->showborder=false;
}//From bkjia.com
@ Set Picture width
Public Function SetWidth ($w) {
$this->width= $w;
}
@ Set Picture height
Public Function SetHeight ($h) {
$this->height= $h;
}
@ Set the number of characters
Public Function Settextnumber ($textN) {
$this->textnum= $textN;
}
@ Set Character color
Public Function Setfontcolor ($FC) {
$this->fontcolor=sscanf ($FC, ' #%2x%2x%2x ');
}
@ Set Font size
Public Function Setfontsize ($n) {
$this->fontsize= $n;
}
@ Set Font
Public Function setfontfamily ($FFURL) {
$this->fontfamily= $ffUrl;
}
@ Set Character language
Public Function Settextlang ($lang) {
$this->textlang= $lang;
}
@ Set Picture background
Public Function Setbgcolor ($BC) {
$this->bgcolor=sscanf ($BC, ' #%2x%2x%2x ');
}
@ Set number of interference points
Public Function Setnoisepoint ($n) {
$this->noisepoint= $n;
}
@ Set number of interference lines
Public Function Setnoiseline ($n) {
$this->noiseline= $n;
}
@ setting is distorted
Public Function Setdistortion ($b) {
$this->distortion= $b;
}
@ Set whether borders are displayed
Public Function Setshowborder ($border) {
$this->showborder= $border;
}
@ Initialize Verification code picture
Public Function Initimage () {
if (Empty ($this->width)) {$this->width=floor ($this->fontsize*1.3) * $this->textnum+10;}
if (Empty ($this->height)) {$this->height= $this->fontsize*2;}
$this->image=imagecreatetruecolor ($this->width, $this->height);
if (Empty ($this->bgcolor)) {
$this->randbgcolor=imagecolorallocate ($this->image,mt_rand (100,255), Mt_rand (100,255), Mt_rand (100,255));
}else{
$this->randbgcolor=imagecolorallocate ($this->image, $this->bgcolor[0], $this->bgcolor[1], $this- BGCOLOR[2]);
}
Imagefill ($this->image,0,0, $this->randbgcolor);
}
@ Generate random characters
Public Function Randtext ($type) {
$string = ";
Switch ($type) {
Case ' en ':
$str = ' ABCDEFGHJKLMNPQRSTUVWXY3456789 ';
for ($i =0; $i < $this->textnum; $i +) {
$string = $string. ', '. $str [Mt_rand (0,29)];
}
Break
Case ' CN ':
for ($i =0; $i < $this->textnum; $i +) {
$string = $string. ', '. Chr (rand (0XB0,0XCC)). Chr (rand (0XA1,0XBB));
}
$string =iconv (' GB2312 ', ' UTF-8 ', $string); Convert Encoding to UTF8
Break
}
Return substr ($string, 1);
}
@ Output text to verification code
Public Function CreateText () {
$textArray =explode (', ', $this->randtext ($this->textlang));
$this->textcontent=join (' ', $textArray);
if (Empty ($this->fontcolor)) {
$this->randfontcolor=imagecolorallocate ($this->image,mt_rand (0,100), Mt_rand (0,100), Mt_rand (0,100));
}else{
$this->randfontcolor=imagecolorallocate ($this->image, $this->fontcolor[0], $this->fontcolor[1],$ THIS->FONTCOLOR[2]);
}
for ($i =0; $i < $this->textnum; $i +) {
$angle =mt_rand ( -1,1) *mt_rand (1,20);
Imagettftext ($this->image, $this->fontsize, $angle, 5+ $i *floor ($this->fontsize*1.3), Floor ($this height*0.75), $this->randfontcolor, $this->fontfamily, $textArray [$i]);
}
}
@ Generate Interference points
Public Function Createnoisepoint () {
for ($i =0; $i < $this->noisepoint; $i +) {
$pointColor =imagecolorallocate ($this->image,mt_rand (0,255), Mt_rand (0,255), Mt_rand (0,255));
Imagesetpixel ($this->image,mt_rand (0, $this->width), Mt_rand (0, $this->height), $pointColor);
}
}
@ Generate interference Line
Public Function Createnoiseline () {
for ($i =0; $i < $this->noiseline; $i +) {
$lineColor =imagecolorallocate ($this->image,mt_rand (0,255), Mt_rand (0,255), 20);
Imageline ($this->image,0,mt_rand (0, $this->width), $this->width,mt_rand (0, $this->height), $lineColor) ;
}
}
@ Warp Text
Public Function Distortiontext () {
$this->distortionimage=imagecreatetruecolor ($this->width, $this->height);
Imagefill ($this->distortionimage,0,0, $this->randbgcolor);
for ($x =0; $x < $this->width; $x +) {
for ($y =0; $y < $this->height; $y +) {
$rgbColor =imagecolorat ($this->image, $x, $y);
Imagesetpixel ($this->distortionimage, (int) ($x +sin ($y/$this->height*2*m_pi-m_pi*0.5), $y, $rgbColor);
}
}
$this->image= $this->distortionimage;
}
@ Generate Verification Code picture
Public Function CreateImage () {
$this->initimage (); Create a basic picture
$this->createtext (); Output Verification Code characters
if ($this->distortion) {$this->distortiontext ();}//Warp text
$this->createnoisepoint (); Generate Interference points
$this->createnoiseline (); Generate interference lines
if ($this->showborder) {imagerectangle ($this->image,0,0, $this->width-1, $this->height-1, $this- Randfontcolor);} Add a border
Imagepng ($this->image);
Imagedestroy ($this->image);
if ($this->distortion) {Imagedestroy ($this, $distortionImage);}
return $this->textcontent;
}
}
How to use:
Copy to ClipboardWhat to refer to: [www.bkjia.com] Session_Start ();
Header ("Content-type:image/png");
Include (' captcha5_class.php ');
$captcha 5=new Captcha ();
@ Set Verification Code width
$captcha 5->setwidth (200);
@ Set Verification Code height
$captcha 5->setheight (50);
@ Set the number of characters
$captcha 5->settextnumber (5);
@ Set Character color
$captcha 5->setfontcolor (' #ff9900 ');
@ Set Font size
$captcha 5->setfontsize (25);
@ Set Font
$captcha 5->setfontfamily (' C:\\windows\\fonts\\stxingka. TTF ');
@ Set Language
$captcha 5->settextlang (' cn ');
@ Set Background color
$captcha 5->setbgcolor (' #000000 ');
@ Set number of interference points
$captcha 5->setnoisepoint (600);
@ Set number of interference lines
$captcha 5->setnoiseline (10);
@ setting is distorted
$captcha 5->setdistortion (TRUE);
@ Set whether borders are displayed
$captcha 5->setshowborder (TRUE);
Output Verification Code
$code = $captcha 5->createimage ();
$_session[' Captchacode ' [' content ']= $code;
$_session[' Captchacode ' [' Time ']=microtime ();
?>
http://www.bkjia.com/PHPjc/364723.html www.bkjia.com true http://www.bkjia.com/PHPjc/364723.html techarticle in the actual project development often encounter the problem of verification code, such as landing page, Message page, registration page Verification Code principle is very simple: the use of GD library to create a picture, of course, the picture ...
