php验证码制作

Question

<?phprequire_once 'strings.func.php';//通过GD库做验证码//function verifyImage($type=1,$length=4,$pixel=0,$line=0,$sess_name = "verify"){header ( "content-type:image/png" );   // session_start();    //创建画布    $width = 80;    $height = 28;    $image = imagecreatetruecolor($width, $height);    $white = imagecolorallocate ( $image, 255, 255, 255 );    $black = imagecolorallocate ( $image, 0, 0, 0 );    //用填充矩形填充画布    imagefilledrectangle ( $image, 1, 1, $width - 2, $height - 2, $white );    $chars = buildRandomString ( $type, $length );    $sess_name="verify";   $_SESSION [$sess_name] = $chars;   $fontfiles = array ("MSYH.TTF", "MSYHBD.TTF", "SIMLI.TTF", "SIMSUN.TTC", "SIMYOU.TTF", "STZHONGS.TTF" );    //$fontfiles = array ("MSYH.TTF" );    //由于字体文件比较大，就只保留一个字体，如果有需要的同学可以自己添加字体，字体在你的电脑中的fonts文件夹里有，直接运行输入fonts就能看到相应字体    for($i = 0; $i < $length; $i ++) {        $size = mt_rand ( 14, 18 );        $angle = mt_rand ( - 15, 15 );        $x = 5 + $i * $size;        $y = mt_rand ( 20, 26 );        $fontfile = "../fonts/" . $fontfiles [mt_rand ( 0, count ( $fontfiles ) - 1 )];        $color = imagecolorallocate ( $image, mt_rand ( 50, 90 ), mt_rand ( 80, 200 ), mt_rand ( 90, 180 ) );        $text = substr ( $chars, $i, 1 );        imagettftext ( $image, $size, $angle, $x, $y, $color, $fontfile, $text );        /*if ($pixel) {        for($i = 0; $i < 50; $i ++) {            imagesetpixel ( $image, mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), $black );        }    }    if ($line) {        for($i = 1; $i < $line; $i ++) {            $color = imagecolorallocate ( $image, mt_rand ( 50, 90 ), mt_rand ( 80, 200 ), mt_rand ( 90, 180 ) );            imageline ( $image, mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), mt_rand ( 0, $width - 1 ), mt_rand ( 0, $height - 1 ), $color );        }    }    */    imagegif ( $image );    imagedestroy ( $image );}用image标签输出不了。

Answer 1

给你个建议，自己一样一样的检查从画布创建开始一步一步来，，，就很快了，