PHP 5.0.1 中 GD2.0.28 支持创建 GIF 图像了［附一个图片验证程序］

[url=http://www.php.net][url=http://www.php.net][url=http://www.php.net]PHP 5.0.1 中 GD2.0.28 支持创建 GIF 图像了，我测试了下，确实如此。附上我写的一个图片验证代码，我乱封装成Class了，其实用function就可以了。自己修改吧，呵呵。

<?php

/**

* @author ShenKong <shenkong@openphp.cn>

* @version $id

* @package SPB Forum System

class CheckImage

{

public $bgLength;

public $bgWidth;

public $bgColor;

public $fontSize;

public $fontType;

public $length;

public $image;

public $string;

function __construct($info)

{

$this->bgLength = $info["bgLength"];

$this->bgWidth = $info["bgWidth"];

$this->fontSize = $info["fontSize"];

$this->fontType = $info["fontType"];

$this->length = $info["length"];

$this->image = $this->createImage();

//$black = imagecolorallocate($this->image, 0x00, 0x00, 0x00);

$white = imagecolorallocate($this->image, 0xFF, 0xFF, 0xFF);

imagefilledrectangle($this->image, 0, 0, $this->bgLength, $this->bgWidth, $white);

$this->mixImage(500, 10);

$this->write();

$this->mixImage(50, 5);

// 设置白色为透明

imagecolortransparent($this->image, $white);

header("Content-Type: image/gif");

imagegif($this->image);

}

function createImage()

{

return imagecreatetruecolor($this->bgLength, $this->bgWidth);

}

function randColor()

{

return imagecolorallocate($this->image, mt_rand(0, 200), mt_rand(0, 100), mt_rand(0, 150));

}

public function write()

{

$str = md5(mt_rand());

$str = strtoupper($str);

$str = str_replace(array("I", "1", "5", "S", "4", "A", "8", "B", "0", "D"), "", $str);

$str = substr($str, 0, $this->length);

$this->string = $str;

$w = ($this->bgLength - ($this->length - 1) * 3) / $this->length;

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

{

imagettftext($this->image, $this->fontSize, mt_rand(-20, 20), mt_rand($i * $w + $i * 3, ($i + 1) * $w + $i * 3 - $this->fontSize), mt_rand($this->fontSize, $this->bgWidth - $this->bgWidth / 10), $this->randColor(), $this->fontType, substr($str, $i, 1));

}

function setString()

{

require_once "Session.class.php";

$s = new Session();

$s->setPath();

}

function mixImage($num = 500, $fontSize = 10)

{

for ($i = 0; $i < $num; $i++)

{

imagettftext($this->image, $fontSize, mt_rand(-180, 180), mt_rand(1, $this->bgLength), mt_rand(1, $this->bgWidth), imagecolorallocate($this->image, mt_rand(150, 255), mt_rand(150, 255), mt_rand(150, 255)), $this->fontType, "|");

}

$info = array (

"bgLength" => 90,

"bgWidth" => 30,

"fontSize" => 18,

"fontType" => "Arial",

"length" => 5

);

new CheckImage($info);