在http://blog.csdn.net/countstars/上看到的,OO方式，觉得写得不错！ ＜?php /** * @author ShenKong * @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); ?>