无法显示验证码图像。获取方形缩略图而不是验证码图片（Core PHP）

时间：2019-06-10 07:01:40

标签： javascript php html captcha

我无法显示使用核心PHP生成的验证码图像。它显示方形缩略图而不是验证码图像。字体文件和路径是最新的。

代替正方形缩略图（就像没有图像并且静止图像路径打开一样），它应该显示验证码

代码：index.php（用于在前端显示）

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Captcha Demo - UandBlog</title>
</head>

<body style="background-color:#D8D8D8;">

<div style="width:500px; margin:0 auto; margin-top:100px; background:#F0F0F0; padding:10px;">

<h2>Captcha Demo - UandBlog</h2>

<form action="submitPage.php" method="post">
    <table width="100%" border="0" cellspacing="5" cellpadding="5">
      <tr style="color:#F00;">
             <td colspan="2" style="font-family:Arial, Helvetica, sans-serif; font-size:15px;">
              <?php if(isset($_REQUEST['msg1'])){?>
              <?php echo $_REQUEST['msg1'];?>
              <?php } ?>
            </td>
                    </tr>
      <tr>
        <td>Name:</td>
        <td><input name="name" type="text" required></td>
      </tr>
      <tr>
        <td>Email:</td>
        <td><input name="email" type="email"></td>
      </tr>
      <tr>
        <td>Message:</td>
        <td><textarea name="msg" cols="" rows=""></textarea></td>
      </tr>

      <tr>
        <td style=" text-transform:uppercase;" valign="top">captcha:</td>

        <td>*Please fill in the captcha security below</td>
      </tr>

       <tr>

        <td valign="top">&nbsp;</td>
        <td ><input id="6_letters_code_1" name="6_letters_code_1" required type="text" style="border:1px solid #e2d5ca !important;"></td>
      </tr>

      <tr>

        <td class="blk"  valign="top">&nbsp;</td>
        <td>
            <table width="100%" border="0" cellspacing="0" cellpadding="0">


              <tr>
                <td style="text-align:left;"> <img src="captcha_code_file.php?rand=<?php echo rand();?>" id='captchaimg' width="40%"></td>
                <td style="text-align:right;"></td>
              </tr>
              <tr>

                   <td colspan="2" style="font-family:Arial, Helvetica, sans-serif; font-size:11px;"> Can't read the image? click <a href='javascript: refreshCaptcha();' style="color:#F00;">here</a> to refresh</td>

              </tr>
            </table>

        </td>
      </tr>
      <tr>
            <td></td>
            <td><button class="submit_btn" name="Submit1" type="submit">Submit</button></td>

      </tr>
    </table>
</form>

</div>


    <script type='text/javascript'>
        function refreshCaptcha()
        {
            var img = document.images['captchaimg'];
            img.src = img.src.substring(0,img.src.lastIndexOf("?"))+"?rand="+Math.random()*1000;
        }
    </script>

</body>

</html>

代码：captcha_code_file.php（用于生成验证码图像）

    <?php 
session_start();
//Settings: You can customize the captcha here
$image_width = 200;
$image_height = 60;
$characters_on_image = 5;
$font = './monofont.ttf';

//The characters that can be used in the CAPTCHA code.
//avoid confusing characters (l 1 and i for example)
$possible_letters = '23456789bcdfghjkmnpqrstvwxyz';
$random_dots = 140;
$random_lines = 5;
$captcha_text_color="0x142864";
$captcha_noice_color = "0x142864";

$code = '';


$i = 0;
while ($i < $characters_on_image) { 
$code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1);
$i++;
}


$font_size = $image_height * 0.75;
$image = @imagecreate($image_width, $image_height);


/* setting the background, text and noise colours here */
$background_color = imagecolorallocate($image, 255, 255, 255);

$arr_text_color = hexrgb($captcha_text_color);
$text_color = imagecolorallocate($image, $arr_text_color['red'], 
        $arr_text_color['green'], $arr_text_color['blue']);

$arr_noice_color = hexrgb($captcha_noice_color);
$image_noise_color = imagecolorallocate($image, $arr_noice_color['red'], 
        $arr_noice_color['green'], $arr_noice_color['blue']);


/* generating the dots randomly in background */
for( $i=0; $i<$random_dots; $i++ ) {
imagefilledellipse($image, mt_rand(0,$image_width),
 mt_rand(0,$image_height), 2, 3, $image_noise_color);
}


/* generating lines randomly in background of image */
for( $i=0; $i<$random_lines; $i++ ) {
imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height),
 mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color);
}


/* create a text box and add 6 letters code in it */
$textbox = imagettfbbox($font_size, 0, $font, $code); 
$x = ($image_width - $textbox[4])/2;
$y = ($image_height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code);


/* Show captcha image in the page html page */
header('Content-Type: image/jpeg');// defining the image type to be shown in browser widow
imagejpeg($image);//showing the image
imagedestroy($image);//destroying the image instance
$_SESSION['6_letters_code_1'] = $code;

function hexrgb ($hexstr)
{
  $int = hexdec($hexstr);

  return array("red" => 0xFF & ($int >> 0x10),
               "green" => 0xFF & ($int >> 0x8),
               "blue" => 0xFF & $int);
}
?>

1 个答案:

答案 0 :(得分：0)

重新处理了验证码代码后，我发现了这个问题-即字体路径不正确（在我的系统上肯定是），并且当使用完全限定的路径时，验证码可以正常工作。所以-我建议使用完整的字体路径，而不是这里使用的./语法...我修改了hexrgb函数以仅因为喜欢它而输出对象。 / p>

如果用您的代码注释掉了输出图像的最后几行（或尝试），您应该得到（好吧，我确实）了一条错误消息

  

警告：imagettfbbox（）[function.imagettfbbox.html]：无效的字体   文件名输入..... 

<?php 
    session_start();

    $width = 200;
    $height = 60;
    $characters = 5;
    $font = 'c:/wwwroot/webfonts/arial.ttf';


    $chars = '23456789bcdfghjkmnpqrstvwxyz';
    $random_dots = 140;
    $random_lines = 5;
    $captcha_text_color="0x142864";
    $captcha_noise_color = "0x142864";

    $code = '';


    $i = 0;
    while( $i < $characters ) { 
        $code .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
        $i++;
    }


    $font_size = $height * 0.75;
    $image = @imagecreate( $width, $height );


    $background_color = imagecolorallocate($image, 255, 255, 255);

    $rgb = hexrgb( $captcha_text_color );
    $text_color = imagecolorallocate($image, 
        $rgb->r,
        $rgb->g, 
        $rgb->b
    );

    $rgb = hexrgb( $captcha_noise_color );
    $noise_color = imagecolorallocate($image, 
        $rgb->r, 
        $rgb->g, 
        $rgb->b
    );


    /* generating the dots randomly in background */
    for( $i=0; $i < $random_dots; $i++ ) {
        imagefilledellipse( $image, mt_rand( 0, $width ), mt_rand( 0, $height ), 2, 3, $noise_color );
    }


    /* generating lines randomly in background of image */
    for( $i=0; $i < $random_lines; $i++ ) {
        imageline( $image, mt_rand( 0, $width ), mt_rand( 0, $height ), mt_rand( 0, $width ), mt_rand( 0, $height ), $noise_color );
    }


    /* create a text box and add 6 letters code in it */
    $textbox = imagettfbbox( $font_size, 0, $font, $code ); 
    $x = ( $width - $textbox[4] )/2;
    $y = ( $height - $textbox[5] )/2;
    imagettftext( $image, $font_size, 0, $x, $y, $text_color, $font , $code );



    header('Content-Type: image/jpeg');
    imagejpeg( $image );
    imagedestroy( $image );

    $_SESSION['6_letters_code_1'] = $code;




    function hexrgb( $hexstr ){
      $int = hexdec( $hexstr );
      return (object)array(
            'r' => 0xFF & ($int >> 0x10),
            'g' => 0xFF & ($int >> 0x8),
            'b' => 0xFF & $int
        );
    }
?>

它产生的验证码示例

captcha

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