php验证码无法显示

example_form.php
<?php
session_start();
?>
<html>
<head>
  <title>Securimage Test Form</title>
</head><body><?php
if (empty($_POST)) { ?>
<form method="POST">
Username:<br />
<input type="text" name="username" /><br />
Password:<br />
<input type="text" name="password" /><br />
<img src="securimage_show.php?sid=<?php echo md5(uniqid(time())); ?>"><br />
<input type="text" name="code" /><br /><input type="submit" value="Submit Form" />
</form><?php
} else { //form is posted
  include("securimage.php");
  $img = new Securimage();
  $valid = $img->check($_POST['code']);  if($valid == true) {
    echo "<center>Thanks, you entered the correct code.</center>";
  } else {
    echo "<center>Sorry, the code you entered was invalid.  <a href=\"javascript:history.go(-1)\">Go back</a> to try again.</center>";
  }
}?></body>
</html>其余代码就不放了，太大了，怕你们看得眼花，是Securimage组件来的，专门提供php下的验证码显示，代码应该不会有问题的，这么多人用它

多数是路径的问题多试试
<img src="**/**/**/identify.php" style="vertical-align:middle;" id="img_code" onclick="this.src=this.src+'?'">

securimage_show.php?sid=d74052e34804b9d5499e72253ec237df
粘贴到浏览器中回车看看没有图的话还是路径问题

<?php
} else { //form is posted
  include("securimage.php");
  $img = new Securimage();
  $valid = $img->check($_POST['code']);  if($valid == true) {
  echo "<center>Thanks, you entered the correct code.</center>";
  } else {
  echo "<center>Sorry, the code you entered was invalid. <a href=\"javascript:history.go(-1)\">Go back</a> to try again.</center>";
  }
}?>图片输出是不能有其他东西输出的,只能单独输出图片;

给你一个现成的,直接保存成php文件,然后<img src="?.php">调用即可
<?php
/**
* 验证码类
* 注:需要GD库支持
*/
Session_start();
Class Coder{
Private $config;
Private $im;
Private $str; Function __construct(){
$this->config['width']=50;
$this->config['height']=20;
$this->config['boxline']=False;
$this->config['codname']="coder";
$this->config['type']="int";
$this->config['length']=4;
$this->config['color']=array(246,246,246);
$this->config['interfere']=3; $this->str['default']="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$this->str['string']="abcdefghijklmnopqrstuvwxyz";
$this->str['int']="0123456789";
} //配置
Public Function init($config=array()){
IF(!empty($config) && is_array($config)){
Foreach($config as $key=>$value){
$this->config[$key]=$value;
}
}
} //输出验证码
Public Function create(){
IF(!Function_exists("Imagecreate")){
Return False;
}
$this->create_do();
} //创建
Private Function create_do(){
$this->im=Imagecreate($this->config['width'],$this->config['height']);
//设置背景为白色
Imagecolorallocate($this->im,$this->config['color'][0],$this->config['color'][1],$this->config['color'][2]); //为此背景加个边框
IF($this->config['boxline']==True){
$bordercolor=Imagecolorallocate($this->im,37,37,37);
Imagerectangle($this->im,0,0,$this->config['width']-1,$this->config['height']-1,$bordercolor);
} //生成验证码
$this->create_str();
$coder=$_SESSION[$this->config['codname']]; //输入文字
$fontcolor=Imagecolorallocate($this->im,46,46,46);
For($i=0;$i<$this->config['length'];$i++){
Imagestring($this->im,5,$i*10+6,rand(2,5),$coder[$i],$fontcolor);
} //加入干扰线
$interfere=$this->config['interfere'];
$interfere=$interfere>30?"30":$interfere;
IF(!empty($interfere) && $interfere>1){
For($i=1;$i<$interfere;$i++){
$linecolor=Imagecolorallocate($this->im,rand(0,255),rand(0,255),rand(0,255));
$x=rand(1,$this->config['width']);
$y=rand(1,$this->config['height']);
$x2=rand($x-10,$x+10);
$y2=rand($y-10,$y+10);
Imageline($this->im,$x,$y,$x2,$y2,$linecolor);
}
} Header("Pragma:no-cache\r\n");
Header("Cache-Control:no-cache\r\n");
Header("Expires:0\r\n");
Header("Content-type:Image/jpeg\r\n");
Imagejpeg($this->im);
Imagedestroy($this->im);
Exit;
} //得到验证码
Private Function create_str(){
IF($this->config['type']=="int"){
For($i=1;$i<=$this->config['length'];$i++){
$coder.=Rand(0,9);
}
$_SESSION[$this->config['codname']]=$coder;
Return True;
}
$len=strlen($this->str[$this->config['type']]);
IF(!$len){
$this->config['type']="default";
$this->create_str();
}
For($i=1;$i<=$this->config['length'];$i++){
$offset=rand(0,$len-1);
$coder.=substr($this->str[$this->config['type']],$offset,1);
}
$_SESSION[$this->config['codname']]=$coder;
Return True;
}
}/**
* 默认验证码SESSION为:$_SESSION['coder'];
* 注意在给变量符值时不要把变量的名子和SESSION冲突
* 注:在验证时不分大小写
*/
$v = New Coder;
//$config['width'] = 50; //验证码宽
//$config['height'] = 20; //验证码高
//$config['boxline'] = True; //是否有边框线
//$config['codname'] = "coder"; //检查验证码时用的SESSION
//$config['type'] = "default"; //验证码展示的类型default:大写字母,string:小写字母,int:数字
//$config['length'] = 4; //验证码长度
//$config['color']=array(246,246,246); //背景色,RGB颜色值
//$config['interfere']= 0; //干扰线强度,范围为1-30,0或空为不起用干扰线
//$v->init($config); //将配置信息写入
$v->create();
?>

9楼兄弟给的有用，不知我这个问题出在哪了
securimage_show.php<?php
include 'securimage.php';
$img = new securimage();
$img->show(); // alternate use:  $img->show('/path/to/background.jpg');
?>securimage.php<?php
define('SI_IMAGE_JPEG', 1);
define('SI_IMAGE_PNG',  2);
define('SI_IMAGE_GIF',  3);
class Securimage {
  var $image_width = 175;
  var $image_height = 45;
  var $image_type = SI_IMAGE_PNG;
  var $code_length = 4;
  var $charset = 'ABCDEFGHKLMNPRSTUVWYZ23456789';
  var $wordlist_file = '../words/words.txt';
  var $use_wordlist  = true;
  var $use_gd_font = false;
  var $gd_font_file = 'gdfonts/bubblebath.gdf';
  var $gd_font_size = 20;
  var $ttf_file = "./elephant.ttf";
  var $font_size = 24;
  var $text_angle_minimum = -20;
  var $text_angle_maximum = 20;
  var $text_x_start = 8;
  var $text_minimum_distance = 30;
  var $text_maximum_distance = 33;
  var $image_bg_color = "#e3daed";
  var $text_color = "#ff0000";
  var $use_multi_text = true;
  var $multi_text_color = "#0a68dd,#f65c47,#8d32fd";
  var $use_transparent_text = true;
  var $text_transparency_percentage = 15;
  var $draw_lines = true;
  var $line_color = "#80BFFF";
  var $line_distance = 5;
  var $line_thickness = 1;
  var $draw_angled_lines = false;
  var $draw_lines_over_text = false;
  var $arc_linethrough = true;
  var $arc_line_colors = "#8080ff";
  var $audio_path = './audio/';
  var $im;
  var $bgimg;
  var $code;
  var $code_entered;
  var $correct_code;
  function Securimage()
  {
    if ( session_id() == '' ) {
      session_start();
    }
  }
  function show($background_image = "")
  {
    if($background_image != "" && is_readable($background_image)) {
      $this->bgimg = $background_image;
    }
    $this->doImage();
  }
  function check($code)
  {
    $this->code_entered = $code;
    $this->validate();
    return $this->correct_code;
}
  function doImage()
  {
    if($this->use_transparent_text == true || $this->bgimg != "") {
      $this->im = imagecreatetruecolor($this->image_width, $this->image_height);
      $bgcolor = imagecolorallocate($this->im, hexdec(substr($this->image_bg_color, 1, 2)), hexdec(substr($this->image_bg_color, 3, 2)), hexdec(substr($this->image_bg_color, 5, 2)));
      imagefilledrectangle($this->im, 0, 0, imagesx($this->im), imagesy($this->im), $bgcolor);
    } else { //no transparency
      $this->im = imagecreate($this->image_width, $this->image_height);
      $bgcolor = imagecolorallocate($this->im, hexdec(substr($this->image_bg_color, 1, 2)), hexdec(substr($this->image_bg_color, 3, 2)), hexdec(substr($this->image_bg_color, 5, 2)));
    }
    if($this->bgimg != "") { $this->setBackground(); }
    $this->createCode();
    if (!$this->draw_lines_over_text && $this->draw_lines) $this->drawLines();
    $this->drawWord();
    if ($this->arc_linethrough == true) $this->arcLines();
    if ($this->draw_lines_over_text && $this->draw_lines) $this->drawLines();
    $this->output();
  }
  function setBackground()
  {
    $dat = @getimagesize($this->bgimg);
    if($dat == false) { return; }
    switch($dat[2]) {
      case 1:  $newim = @imagecreatefromgif($this->bgimg); break;
      case 2:  $newim = @imagecreatefromjpeg($this->bgimg); break;
      case 3:  $newim = @imagecreatefrompng($this->bgimg); break;
      case 15: $newim = @imagecreatefromwbmp($this->bgimg); break;
      case 16: $newim = @imagecreatefromxbm($this->bgimg); break;
      default: return;
    }
    if(!$newim) return;
    imagecopy($this->im, $newim, 0, 0, 0, 0, $this->image_width, $this->image_height);
  }
  function arcLines()
  {
    $colors = explode(',', $this->arc_line_colors);
    imagesetthickness($this->im, 3);
    $color = $colors[rand(0, sizeof($colors) - 1)];
    $linecolor = imagecolorallocate($this->im, hexdec(substr($color, 1, 2)), hexdec(substr($color, 3, 2)), hexdec(substr($color, 5, 2)));
    $xpos   = $this->text_x_start + ($this->font_size * 2) + rand(-5, 5);
    $width  = $this->image_width / 2.66 + rand(3, 10);
    $height = $this->font_size * 2.14 - rand(3, 10);
    if ( rand(0,100) % 2 == 0 ) {
      $start = rand(0,66);
      $ypos  = $this->image_height / 2 - rand(5, 15);
      $xpos += rand(5, 15);
    } else {
      $start = rand(180, 246);
      $ypos  = $this->image_height / 2 + rand(5, 15);
    }
    $end = $start + rand(75, 110);
    imagearc($this->im, $xpos, $ypos, $width, $height, $start, $end, $linecolor);
    $color = $colors[rand(0, sizeof($colors) - 1)];
    $linecolor = imagecolorallocate($this->im, hexdec(substr($color, 1, 2)), hexdec(substr($color, 3, 2)), hexdec(substr($color, 5, 2)));    if ( rand(1,75) % 2 == 0 ) {
      $start = rand(45, 111);
      $ypos  = $this->image_height / 2 - rand(5, 15);
      $xpos += rand(5, 15);
    } else {
      $start = rand(200, 250);
      $ypos  = $this->image_height / 2 + rand(5, 15);
    }    $end = $start + rand(75, 100);
    imagearc($this->im, $this->image_width * .75, $ypos, $width, $height, $start, $end, $linecolor);
  }
  function drawLines()
  {
    $linecolor = imagecolorallocate($this->im, hexdec(substr($this->line_color, 1, 2)), hexdec(substr($this->line_color, 3, 2)), hexdec(substr($this->line_color, 5, 2)));
    imagesetthickness($this->im, $this->line_thickness);
    for($x = 1; $x < $this->image_width; $x += $this->line_distance) {
      imageline($this->im, $x, 0, $x, $this->image_height, $linecolor);
    }
    for($y = 11; $y < $this->image_height; $y += $this->line_distance) {
      imageline($this->im, 0, $y, $this->image_width, $y, $linecolor);
    }
    if ($this->draw_angled_lines == true) {
      for ($x = -($this->image_height); $x < $this->image_width; $x += $this->line_distance) {
        imageline($this->im, $x, 0, $x + $this->image_height, $this->image_height, $linecolor);
      }
      for ($x = $this->image_width + $this->image_height; $x > 0; $x -= $this->line_distance) {
        imageline($this->im, $x, 0, $x - $this->image_height, $this->image_height, $linecolor);
      }
    }
  }

代码太长，恢复限制，这里补
function drawWord()
  {
    if ($this->use_gd_font == true) {
      if (!is_int($this->gd_font_file)) { //is a file name
        $font = @imageloadfont($this->gd_font_file);
        if ($font == false) {
          trigger_error("Failed to load GD Font file {$this->gd_font_file} ", E_USER_WARNING);
          return;
        }
      } else { //gd font identifier
        $font = $this->gd_font_file;
      }
      $color = imagecolorallocate($this->im, hexdec(substr($this->text_color, 1, 2)), hexdec(substr($this->text_color, 3, 2)), hexdec(substr($this->text_color, 5, 2)));
      imagestring($this->im, $font, $this->text_x_start, ($this->image_height / 2) - ($this->gd_font_size / 2), $this->code, $color);    } else {
      if($this->use_transparent_text == true) {
        $alpha = intval($this->text_transparency_percentage / 100 * 127);
        $font_color = imagecolorallocatealpha($this->im, hexdec(substr($this->text_color, 1, 2)), hexdec(substr($this->text_color, 3, 2)), hexdec(substr($this->text_color, 5, 2)), $alpha);
      } else {
        $font_color = imagecolorallocate($this->im, hexdec(substr($this->text_color, 1, 2)), hexdec(substr($this->text_color, 3, 2)), hexdec(substr($this->text_color, 5, 2)));
      }
      $x = $this->text_x_start;
      $strlen = strlen($this->code);
      $y_min = ($this->image_height / 2) + ($this->font_size / 2) - 2;
      $y_max = ($this->image_height / 2) + ($this->font_size / 2) + 2;
      $colors = explode(',', $this->multi_text_color);
      for($i = 0; $i < $strlen; ++$i) {
        $angle = rand($this->text_angle_minimum, $this->text_angle_maximum);
        $y = rand($y_min, $y_max);
        if ($this->use_multi_text == true) {
          $idx = rand(0, sizeof($colors) - 1);
          $r = substr($colors[$idx], 1, 2);
          $g = substr($colors[$idx], 3, 2);
          $b = substr($colors[$idx], 5, 2);
          if($this->use_transparent_text == true) {
            $font_color = imagecolorallocatealpha($this->im, "0x$r", "0x$g", "0x$b", $alpha);
          } else {
            $font_color = imagecolorallocate($this->im, "0x$r", "0x$g", "0x$b");
          }
        }
        @imagettftext($this->im, $this->font_size, $angle, $x, $y, $font_color, $this->ttf_file, $this->code{$i});        $x += rand($this->text_minimum_distance, $this->text_maximum_distance);
      }
    }
  }
  function createCode()
  {
    $this->code = false;
    if ($this->use_wordlist && is_readable($this->wordlist_file)) {
      $this->code = $this->readCodeFromFile();
    }
    if ($this->code == false) {
      $this->code = $this->generateCode($this->code_length);
    }    $this->saveData();
  }
  function generateCode($len)
  {
    $code = '';
    for($i = 1, $cslen = strlen($this->charset); $i <= $len; ++$i) {
      $code .= strtoupper( $this->charset{rand(0, $cslen - 1)} );
    }
    return $code;
  }
  function readCodeFromFile()
  {
    $fp = @fopen($this->wordlist_file, 'rb');
    if (!$fp) return false;
    $fsize = filesize($this->wordlist_file);
    if ($fsize < 32) return false;
     if ($fsize < 128) {
      $max = $fsize;
    } else {
      $max = 128;
    }
    fseek($fp, rand(0, $fsize - $max), SEEK_SET);
    $data = fread($fp, 128); // read a random 128 bytes from file
    fclose($fp);
    $data = preg_replace("/\r?\n/", "\n", $data);
    $start = strpos($data, "\n", rand(0, 100)) + 1; // random start position
    $end   = strpos($data, "\n", $start);           // find end of word
    return strtolower(substr($data, $start, $end - $start)); // return substring in 128 bytes
  }
  function output()
  {
    header("Expires: Sun, 1 Jan 2000 12:00:00 GMT");
    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
    header("Cache-Control: no-store, no-cache, must-revalidate");
    header("Cache-Control: post-check=0, pre-check=0", false);
    header("Pragma: no-cache");
    switch($this->image_type)
    {
      case SI_IMAGE_JPEG:
        header("Content-Type: image/jpeg");
        imagejpeg($this->im, null, 90);
        break;
      case SI_IMAGE_GIF:
        header("Content-Type: image/gif");
        imagegif($this->im);
        break;      default:
        header("Content-Type: image/png");
        imagepng($this->im);
        break;
    }
    imagedestroy($this->im);
  }
  function getAudibleCode()
  {
    $letters = array();
    $code    = $this->getCode();    if ($code == '') {
      $this->createCode();
      $code = $this->getCode();
    }
    for($i = 0; $i < strlen($code); ++$i) {
      $letters[] = $code{$i};
    }
    return $this->generateWAV($letters);
  }
  function saveData()
  {
    $_SESSION['securimage_code_value'] = strtolower($this->code);
  }
  function validate()
  {
    if ( isset($_SESSION['securimage_code_value']) && !empty($_SESSION['securimage_code_value']) ) {
      if ( $_SESSION['securimage_code_value'] == strtolower(trim($this->code_entered)) ) {
        $this->correct_code = true;
        $_SESSION['securimage_code_value'] = '';
      } else {
        $this->correct_code = false;
      }
    } else {
      $this->correct_code = false;
    }
  }
  function getCode()
  {
    if (isset($_SESSION['securimage_code_value']) && !empty($_SESSION['securimage_code_value'])) {
      return $_SESSION['securimage_code_value'];
    } else {
      return '';
    }
  }
  function checkCode()
  {
    return $this->correct_code;
  }
  function generateWAV($letters)
  {
    $first = true;
    $data_len    = 0;
    $files       = array();
    $out_data    = '';
    foreach ($letters as $letter) {
      $filename = $this->audio_path . strtoupper($letter) . '.wav';
      $fp = fopen($filename, 'rb');
      $file = array();
      $data = fread($fp, filesize($filename)); // read file in
      $header = substr($data, 0, 36);
      $body   = substr($data, 44);
      $data = unpack('NChunkID/VChunkSize/NFormat/NSubChunk1ID/VSubChunk1Size/vAudioFormat/vNumChannels/VSampleRate/VByteRate/vBlockAlign/vBitsPerSample', $header);      $file['sub_chunk1_id']   = $data['SubChunk1ID'];
      $file['bits_per_sample'] = $data['BitsPerSample'];
      $file['channels']        = $data['NumChannels'];
      $file['format']          = $data['AudioFormat'];
      $file['sample_rate']     = $data['SampleRate'];
      $file['size']            = $data['ChunkSize'] + 8;
      $file['data']            = $body;      if ( ($p = strpos($file['data'], 'LIST')) !== false) {
              $info= substr($file['data'], $p + 4, 8);
        $data= unpack('Vlength/Vjunk', $info);
        $file['data'] = substr($file['data'], 0, $p);
        $file['size'] = $file['size'] - (strlen($file['data']) - $p);
      }
      $files[] = $file;
      $data    = null;
      $header  = null;
      $body    = null;
      $data_len += strlen($file['data']);
      fclose($fp);
    }
    $out_data = '';
    for($i = 0; $i < sizeof($files); ++$i) {
      if ($i == 0) { // output header
        $out_data .= pack('C4VC8', ord('R'), ord('I'), ord('F'), ord('F'), $data_len + 36, ord('W'), ord('A'), ord('V'), ord('E'), ord('f'), ord('m'), ord('t'), ord(' '));
        $out_data .= pack('VvvVVvv',
                          16,
                          $files[$i]['format'],
                          $files[$i]['channels'],
                          $files[$i]['sample_rate'],
                          $files[$i]['sample_rate'] * (($files[$i]['bits_per_sample'] * $files[$i]['channels']) / 8),
                          ($files[$i]['bits_per_sample'] * $files[$i]['channels'])/8,
                          $files[$i]['bits_per_sample'] );
        $out_data .= pack('C4', ord('d'), ord('a'), ord('t'), ord('a'));
        $out_data .= pack('V', $data_len);
      }
      $out_data .= $files[$i]['data'];
    }
    return $out_data;
  }
}?>

问题解决了，我在securimage.php这个页面的session_start();前面加了@验证码就显示正常了，但问题又来了，kao，怎么输入验证码提交后都显示不正确，看了securimage.php页面里验证输入正确与否的函数看上去也没有问题啊，郁闷了

调试易

php验证码无法显示

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