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］

　　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 <[email protected]>
     * @version $id
     * @package SPB Forum System
     * @copyright 深空(shenkong)版权所有，任何人修改和使用必须保留此版权信息
     */
    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);
?>

本文地址：http://com.8s8s.com/it/it28563.htm