PHP 中文图形验证码

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PHP 中文图形验证码

CI 自己带了图形验证码，嫌它简单，参考文档写一个中文图形验证码：

        public function create(){

        header('Content-Type: image/png');

        // Create the image
        $im = imagecreatetruecolor(100, 30);

        // Create some colors
        $white = imagecolorallocate($im, 255, 255, 255);
        $grey = imagecolorallocate($im, 128, 128, 128);
        $black = imagecolorallocate($im, 0, 0, 0);
        imagefilledrectangle($im, 0, 0, 399, 29, $white);

        $rndText = "汉字";
        $count = 2;
        $text  = "";
        for($i=0;$i<$count;$i++){
            $index = mt_rand(0, mb_strlen($rndText));
            $text .= mb_substr($rndText,$index,1);
        }

        $_SESSION['code'] = $text ;
        //var_dump($text);

        putenv('GDFONTPATH=' . realpath('.'));
        // Replace path by your own font path
        $font = 'simkai.ttf';

        // Add some shadow to the text
        //imagettftext($im, 20, 0, 11, 21, $grey, $font, $text);

        // Add the text
        imagettftext($im, 20, 0, 8, 25, $black, $font, $text);

        // Using imagepng() results in clearer text compared with     imagejpeg()
        imagepng($im);
        imagedestroy($im);

    }

1、中文图形验证码需要中文字体，字体文件可以baidu
2、字体文件可以放在php脚本的当前目录下