PHP Snowflake Background Verification Code

ValidateCode.class.php

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/**

* Verification Code Class

* @author Staven

*

*/

Class validatecode{

Private $width; Verify the width of the code picture

Private $height; Verify the height of the code picture

Private $checkCode; Verification Code characters

Private $codeNum; Number of verification code characters

Private $font; Font

Private $fontSize; Font size

Private $fontColor; Font Color

Private $image; Verification Code Handle

Private $charset; verifying character random factors

Constructor method Initialization

function __construct ($width =100, $height =20, $codeNum =4, $fontSize = 12) {

$this->width = $width;

$this->height = $height;

$this->codenum = $codeNum;

$this->fontsize = $fontSize;

$this->font = dirname (__file__). '/font/elephant.ttf ';

$this->charset = ' abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789 '; Provide a random factor

$this->checkcode = $this->createcheckcode ();

}

/* For output verification code picture, and the Verification Code information is written to the session */

function __tostring () {

/* Add to session, store subscript as code */

$_session ["code"] = Strtoupper ($this->checkcode);

$this->outimage ();

Return ';

}

/* Generate random Verification code characters */

Private Function Createcheckcode () {

for ($i =0; $i < $this->codenum; $i +) {

$this->checkcode. = $this->charset{rand (0, strlen ($this->charset)-1)};

}

return $this->checkcode;

}

/* Output Verification code */

Private Function Outimage () {

$this->getcreateimage ();

$this->createline ();

$this->outputtext ();

$this->outputimage ();

}

/* Generate Verification Code background picture */

Private Function Getcreateimage () {

$this->image = Imagecreatetruecolor ($this->width, $this->height);

$color = Imagecolorallocate ($this->image, Mt_rand (157,255), Mt_rand (157,255), Mt_rand (157,255));

Imagefilledrectangle ($this->image,0, $this->height, $this->width,0, $color);

}

/* Write a text message to the handle picture */

Private Function Outputtext () {

$_x = $this->width/$this->codenum;

for ($i =0; $i < $this->codenum; $i +) {

$this->fontcolor = imagecolorallocate ($this->image,mt_rand (0,156), Mt_rand (0,156), Mt_rand (0,156));

Imagettftext ($this->image, $this->fontsize,mt_rand ( -30,30), $_x * $i +mt_rand (1,5), $this->height/1.4, $thi S->fontcolor, $this->font, $this->checkcode[$i]);

}

}

/* Create snowflake pattern */

Private Function Createline () {

for ($i =0; $i <6; $i + +) {

$color = Imagecolorallocate ($this->image,mt_rand (0,156), Mt_rand (0,156), Mt_rand (0,156));

Imageline ($this->image,mt_rand (0, $this->width), Mt_rand (0, $this->height), Mt_rand (0, $this->width), MT _rand (0, $this->height), $color);

}

for ($i =0; $i <100; $i + +) {

$color = Imagecolorallocate ($this->image,mt_rand (200,255), Mt_rand (200,255), Mt_rand (200,255));

Imagestring ($this->image,mt_rand (1,5), Mt_rand (0, $this->width), Mt_rand (0, $this->height), ' * ', $color);

}

}

/* Generate CAPTCHA Picture */

Private Function Outputimage () {

Header (' content-type:image/png ');

Imagepng ($this->image);

Imagedestroy ($this->image);

}

/* Destroy the handle and release the resource */

function __destruct () {

Imagedestroy ($this->image);

}

}

imagecode.php

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Session_Start (); Open session

Require_once ' ValidateCode.class.php ';

echo New Validatecode ();

image.php

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Verification Code

/** for */

Session_Start (); Open session

if (Isset ($_post [' submit ')]) {//To determine the execution of the user after submission

/* Determine if the string in the form entered by the user is the same as that in the CAPTCHA picture */

if (Strtoupper (Trim ($_post ["code])) = = = $_session [' code ']) {//If the verification code output is successful

Echo ' Verification code entered successfully
' ; Output a successful message

} else {//If the CAPTCHA input fails

echo ' Verification code input Error!!
' ; Output failed input information

}

}

?>

From for notes (Wiz)

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