79 lines
2.5 KiB
PHP
79 lines
2.5 KiB
PHP
<?
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class ValidateCode {
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private $charset = '0123456789';//随机因子
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private $code;//验证码
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private $codelen = 4;//验证码长度
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private $width = 130;//宽度
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private $height = 50;//高度
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private $img;//图形资源句柄
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private $font;//指定的字体
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private $fontsize = 25;//指定字体大小
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private $fontcolor;//指定字体颜色
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//构造方法初始化
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public function __construct() {
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$this->font = 'include/font/Elephant.ttf';//注意字体路径要写对，否则显示不了图片
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}
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//生成随机码
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private function createCode() {
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$_len = strlen($this->charset)-1;
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for ($i=0;$i<$this->codelen;$i++) {
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$this->code .= $this->charset[mt_rand(0,$_len)];
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}
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}
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//生成背景
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private function createBg() {
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$this->img = imagecreatetruecolor($this->width, $this->height);
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$color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
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imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
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}
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//生成文字
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private function createFont() {
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$_x = $this->width / $this->codelen;
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for ($i=0;$i<$this->codelen;$i++) {
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$this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
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}
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}
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//生成线条、雪花
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private function createLine() {
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//线条
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for ($i=0;$i<6;$i++) {
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$color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
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imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
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}
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//雪花
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for ($i=0;$i<100;$i++) {
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$color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
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imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
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}
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}
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//输出
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private function outPut() {
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header('Content-type:image/png');
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imagepng($this->img);
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imagedestroy($this->img);
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}
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//对外生成
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public function getimg() {
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$this->createBg();
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$this->createCode();
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$this->createLine();
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$this->createFont();
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ob_start();
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imagepng($this->img);
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imagedestroy($this->img);
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$img = ob_get_clean();
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return array($img, $this->code);
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}
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//获取验证码
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public function getCode() {
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return strtolower($this->code);
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}
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}
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session_start();
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$_vc = new ValidateCode(); //实例化一个对象
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$a = $_vc->getimg();
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//echo '<img src="data:image/png;base64,'.base64_encode($a[0]).'" /><br />'.$a[1];
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$_SESSION['ftyzm'] = $a[1];
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header("Content-Type: image/png");
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echo $a[0]; |