Verification code class in PHP (perfect verification code)

Last Update:2016-04-21 Source: Internet

Author: User

Tags php server set background

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Operation Result:

<?php
Class Vcode {
Private $width; Wide
Private $height; High
Private $num; Number
Private $code; Verification Code
Private $img; Resources for images

Construction method, three parameters
function __construct ($width =80, $height =20, $num =4) {
$this->width = $width;
$this->height = $height;
$this->num = $num;
$this->code = $this->createcode (); Call your own method
}

Gets the verification code for the character to be saved in the server
function GetCode () {
return $this->code;
}

Output image
function outimg () {
Create background (color, size, border)
$this->createback ();

stooped (size, font color)
$this->outstring ();

Interference elements (points, lines)

$this->setdisturbcolor ();
Output image
$this->printimg ();
}

Create a background
Private Function Createback () {
Create a resource
$this->img = Imagecreatetruecolor ($this->width, $this->height);
Set a random background color
$bgcolor = Imagecolorallocate ($this->img, rand (225, 255), rand (225, 255), rand (225, 255));
Set Background fill
Imagefill ($this->img, 0, 0, $bgcolor);
Draw Border
$bordercolor = Imagecolorallocate ($this->img, 0, 0, 0);

Imagerectangle ($this->img, 0, 0, $this->width-1, $this->height-1, $bordercolor);
}

Stooped
Private Function outstring () {
for ($i =0; $i < $this->num; $i +) {

$color = Imagecolorallocate ($this->img, rand (0, +), rand (0, +), rand (0, 128));

$fontsize =rand (3,5); Font size

$x = ($this->width/$this->num) * $i; Horizontal position
$y = rand (0, Imagefontheight ($fontsize)-3);

Draw each character
Imagechar ($this->img, $fontsize, $x, $y, $this->code{$i}, $color);
}
}

Setting interference elements
Private Function Setdisturbcolor () {
Add points, 100 points
for ($i =0; $i <100; $i + +) {
$color = Imagecolorallocate ($this->img, rand (0, 255), rand (0, 255), rand (0, 255));
Imagesetpixel ($this->img, rand (1, $this->width-2), rand (1, $this->height-2), $color);
}

Add lines, 10 lines
for ($i =0; $i <10; $i + +) {
$color = Imagecolorallocate ($this->img, rand (0, 255), rand (0, $), rand (0, 255));
Imagearc ($this->img,rand ( -10, $this->width+10), rand ( -10, $this->height+10), rand (+), rand (30, 300), 55,44, $color);
}
}

Output image
Private Function printimg () {
if (Imagetypes () & Img_gif) {
Header ("Content-type:image/gif");
Imagegif ($this->img);
} elseif (Function_exists ("imagejpeg")) {
Header ("Content-type:image/jpeg");
Imagegif ($this->img);
} elseif (Imagetypes () & Img_png) {
Header ("Content-type:image/png");
Imagegif ($this->img);
} else {
Die ("No image, support in this PHP server");
}

}

Generate Authenticode String
Private Function Createcode () {
$codes = "3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKLMNPQRSTUVWXY";

$code = "";

for ($i =0; $i < $this->num; $i +) {
$code. = $codes {rand (0, strlen ($codes)-1)};
}

return $code;
}

For automatic destruction of image resources
function __destruct () {
Imagedestroy ($this->img);
}

}

<?php
Session_Start ();
if (Isset ($_post[' Dosubmit ')) {
if (Strtoupper ($_session[' code ')) = = Strtoupper ($_post[' code ')) {
echo "Input success!<br>";
}else{
echo "Input not!<br>";
}
}
?>

<body>
<form action= "reg.php" method= "POST" >
Username: <input type= "text" name= "username" > <br>
Password: <input type= "password" name= "password" > <br>
Code: <input type= "text" onkeyup= "if (This.value!=this.value.touppercase ()) this.value=this.value.touppercase ()" Size= "6" name= "Code" >
<br>

<!--code.php Content--

<?php
Open session
Session_Start ();
Include "vcode.class.php";
Construction method
$vcode = new Vcode (80, 30, 4);
Save a copy of the validation to the server's own space
$_session[' Code ' = $vcode->getcode ();
The Captcha picture output
$vcode->outimg ();

Verification code class in PHP (perfect verification code)

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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