PHP dynamically generates random captcha class code
- 2020-03-31 20:31:33
- OfStack
Below is the effect diagram, this effect diagram is not open interference code effect diagram
< img border = 0 SRC = "http://files.jb51.net/upload/2010-4/20100409165642445.jpg" >
Here is the class code
< img border = 0 SRC = "http://files.jb51.net/upload/2010-4/20100409165642445.jpg" >
Here is the class code
<?php
/************************************************
//FILE:ImageCode
//DONE: generate dynamic captcha classes
//DATE"2010-3-31
//5D happy blog
************************************************************************/
class ImageCode{
private $width; //Captcha image width
private $height; //Captcha image height
private $codeNum; //Number of verification code characters
private $checkCode; //Verification code character
private $image; //Captcha canvas
/************************************************************************
//Function: constructor
//Done: member property initialization
// 5D happy blog
************************************************************************/
function __construct($width=60,$height=20,$codeNum=4)
{
$this->width = $width;
$this->height = $height;
$this->codeNum = $codeNum;
$this->checkCode = $this->createCheckCode();
}
function showImage()
{
$this->getcreateImage();
$this->outputText();
$this->setDisturbColor();
$this->outputImage();
}
function getCheckCode()
{
return $this->chekCode;
}
private function getCreateImage()
{
$this->image = imagecreatetruecolor($this->width,$this->height);
$back = imagecolorallocate($this->image,255,255,255);
$border = imagecolorallocate($this->image,255,255,255);
imagefilledrectangle($this->image,0,0,$this->width-1,$this->height-1,$border);
//Use pure white to fill the rectangle box
//imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border);
}
private function createCheckCode()
{
for($i=0;$i<$this->codeNum;$i++)
{
$number = rand(0,2);
switch($number)
{
case 0: $rand_number = rand(48,57); break;//digital
case 1: $rand_number = rand(65,90);break;//The capital letters
case 2: $rand_number = rand(97,122);break;//Lowercase letters
}
$asc = sprintf("%c",$rand_number);
$asc_number = $asc_number.$asc;
}
return $asc_number;
}
private function setDisturbColor()//Interference Settings
{
for($i=0;$i<=100;$i++)
{
//$color = imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255));
$color = imagecolorallocate($this->image,255,255,255);
imagesetpixel($this->image,rand(1,$this->width-2),rand(1,$this->height-2),$color);
}
//$color = imagecolorallocate($this->image,0,0,0);
//imagesetpixel($this->image,rand(1,$this->width-2),rand(1,$this->height-2),$color);
}
private function outputText()
{
//Random color, random placement, random string output to the image
for($i=0;$i<=$this->codeNum;$i++)
{
$bg_color = imagecolorallocate($this->image,rand(0,255),rand(0,128),rand(0,255));
$x = floor($this->width/$this->codeNum)*$i+3;
$y = rand(0,$this->height-15);
imagechar($this->image,5,$x,$y,$this->checkCode[$i],$bg_color);
}
}
private function outputImage()
{
if(imagetypes()&IMG_GIF)
{
header("Content_type:image/gif");
imagegif($this->image);
}
elseif(imagetypes()&IMG_JPG)
{
header("Content-type:image/jpeg");
imagejpeg($this->image,"",0.5);
}
elseif(imagetypes()&IMG_PNG)
{
header("Content-type:image/png");
imagejpeg($this->image);
}
elseif(imagetypes()&IMG_WBMP)
{
header("Content-type:image/vnd.wap.wbmp");
imagejpeg($this->image);
}
else
{
die("PHP Image creation is not supported ");
}
}
function __destruct()
{
imagedestroy($this->image);
}
}
?>