如何在提交页面中整合（验证）验证码

<?php

// Error reporting:
error_reporting(E_ALL^E_NOTICE);

include \"connect.php\";
include \"comment.class.php\";


/*
/   Select all the comments and populate the $comments array with objects
*/
$id = empty($_GET[\'id\'])?0:$_GET[\'id\'];
$comments = array();
$result = mysql_query(\"SELECT * FROM comments where url=\'$id\' ORDER BY id desc\");

while($row = mysql_fetch_assoc($result))
{
    $comments[] = new Comment($row);
}

?>



<table width=\"800\" border=\"0\" class=\"komentar\" cellpadding=\"0\" cellspacing=\"0\">
<tr>
<td width=\"480\">

<div id=\"addCommentContainer\"  style=\"width:500px; overflow-x:hidden;\">
</div>

<div id=\"main\" style=\"width:500px; overflow-x:hidden;\">

<?php

/*
/   Output the comments one by one:
*/

foreach($comments as $c){
    echo $c->markup();
}

?>

</div>



</td>



<td valign=\"top\" width=\"320\">
    <table width=\"300\" border=\"0\"  cellpadding=\"0\" cellspacing=\"0\">
    <tr>
    <td height=\"16\"  background=\"commentfg.png\" style=\"background-repeat:no-repeat;\">               

    </td>
    </tr>  

    <tr>
    <td height=\"20\"  background=\"commentfs.png\">                
    <form id=\"addCommentForm\" method=\"post\" action=\"\">
        <div style=\"margin-left:15px; color:white;\">

            <label for=\"name\">Vase ime:&nbsp&nbsp</label><br>
            <input type=\"text\" name=\"name\" id=\"name\" />

         <p><label for=\"email\">Email: (bice sakriven)&nbsp&nbsp</label><br>
            <input type=\"text\" name=\"email\" id=\"email\" /></p>


            <input type=\"hidden\" name=\"url\" id=\"url\" value=\"<?php $id = empty($_GET[\'id\'])?0:$_GET[\'id\']; echo $id;?>\"/>

            <label for=\"body\">Unesite komentar:&nbsp&nbsp</label><br>
            <textarea name=\"body\" id=\"body\" cols=\"30\" rows=\"5\" onKeyDown=\"limitText(this.form.body,this.form.countdown,200);\" 
onKeyUp=\"limitText(this.form.body,this.form.countdown,200);\"></textarea><br><br>
            Broj preostalih znakova:(max 200):<input readonly type=\"text\" name=\"countdown\" size=\"3\" value=\"200\"> 
<br>
  <script type=\"text/javascript\"
     src=\"http://www.google.com/recaptcha/api/challenge?k=6LeQc8MSAAAAAMGe16dslbxCRu3Frs_265JhH88j\">
  </script>
  <noscript>
     <iframe src=\"http://www.google.com/recaptcha/api/noscript?k=6LeQc8MSAAAAAMGe16dslbxCRu3Frs_265JhH88j\"
         height=\"300\" width=\"500\" frameborder=\"0\"></iframe><br>
     <textarea name=\"recaptcha_challenge_field\" rows=\"3\" cols=\"40\">
     </textarea>
     <input type=\"hidden\" name=\"recaptcha_response_field\"
         value=\"manual_challenge\">
  </noscript>
<br>

            <input type=\"submit\" id=\"submit\" value=\"Potvrdi\" />

        </div>
    </form>
    </td>
    </tr>

    <tr>
    <td height=\"16\"  background=\"commentfd.png\" style=\"background-repeat:no-repeat;\">               

    </td>
    </tr> 
    </table>    




</td>
</tr>
</table>
<script type=\"text/javascript\" src=\"http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js\"></script>
<script type=\"text/javascript\" src=\"script.js\"></script>

<?php
class Comment
{
    private $data = array();

    public function __construct($row)
    {
        /*
        /   The constructor
        */

        $this->data = $row;
    }

    public function markup()
    {
        /*
        /   This method outputs the XHTML markup of the comment
        */

        // Setting up an alias, so we don\'t have to write $this->data every time:
        $d = &$this->data;

        $link_open = \'\';
        $link_close = \'\';



        // Converting the time to a UNIX timestamp:
        $d[\'dt\'] = strtotime($d[\'dt\']);

        // Needed for the default gravatar image:
        $url = \'http://\'.dirname($_SERVER[\'SERVER_NAME\'].$_SERVER[\"REQUEST_URI\"]).\'/img/default_avatar.png\';

        return \'
           <div  style=\"width:500px; overflow-x:hidden;\">
            <table width=\"500\" >
            <tr>
            <td valign=\"top\" width=\"100\" height=\"120\" background=\"avatar.png\" style=\"background-repeat:no-repeat;\" align=\"center\">

                <div class=\"avatar\" style=\"width:100px; overflow-x:hidden; margin-top:10px; \">
                    \'.$link_open.\'
                    <img src=\"http://www.gravatar.com/avatar/\'.md5($d[\'email\']).\'?size=50&amp;default=\'.urlencode($url).\'\" />
                    \'.$link_close.\'
                </div>
                <div style=\"width:80px; height:40px; overflow:hidden;\">
                <font color=\"#47a5db\">\'.$link_open.$d[\'name\'].$link_close.\'</font>
                </div>

            </td>   
            <td width=\"400\" valign=\"top\">
                <table width=\"400\" border=\"0\"  cellpadding=\"0\" cellspacing=\"0\">
                <tr>
                <td height=\"20\" valign=\"bottom\" background=\"commentg.png\" style=\"background-repeat:no-repeat;\">
                <div class=\"date\" title=\"Added at \'.date(\'H:i \\o\\n d M Y\',$d[\'dt\']).\'\" style=\"margin-left:10px;\">
                <font color=\"silver\" size=\"-1\">\'.date(\'d M Y\',$d[\'dt\']).\'</font>
                </div>              
                </td>
                </tr>

                <tr>
                <td background=\"comments.png\" style=\"background-repeat:repeat-y;\">
                <div style=\"width:350px; overflow-x:hidden; margin-top:0px; margin-left:10px;\">
                <p><font color=\"white\"><b>\'.$d[\'body\'].\'</b></font></p>
                </div>
                </td>
                </tr>

                <tr>
                <td height=\"20\"  background=\"commentd.png\" style=\"background-repeat:no-repeat;\">                

                </td>
                </tr>
                </table>

            </td>
            </tr>
            </table>
          </div>    
        \';
    }

    public static function validate(&$arr)
    {
        /*
        /   This method is used to validate the data sent via AJAX.
        /
        /   It return true/false depending on whether the data is valid, and populates
        /   the $arr array passed as a paremter (notice the ampersand above) with
        /   either the valid input data, or the error messages.
        */

        $errors = array();
        $data   = array();

        // Using the filter_input function introduced in PHP 5.2.0

        if(!($data[\'email\'] = filter_input(INPUT_POST,\'email\',FILTER_VALIDATE_EMAIL)))
        {
            $errors[\'email\'] = \'Unesite validan Email!\';
        }

        if(!($data[\'url\'] = filter_input(INPUT_POST,\'url\',FILTER_CALLBACK,array(\'options\'=>\'Comment::validate_text\'))))
        {
            // If the URL field was not populated with a valid URL,
            // act as if no URL was entered at all:

            $errors[\'url\'] = \'Please enter a url.\';
        }

        // Using the filter with a custom callback function:

        if(!($data[\'body\'] = filter_input(INPUT_POST,\'body\',FILTER_CALLBACK,array(\'options\'=>\'Comment::validate_text\'))))
        {
            $errors[\'body\'] = \'Niste uneli komentar!\';
        }

        if(!($data[\'name\'] = filter_input(INPUT_POST,\'name\',FILTER_CALLBACK,array(\'options\'=>\'Comment::validate_text\'))))
        {
            $errors[\'name\'] = \'Niste uneli ime!\';
        }

        if(!empty($errors)){

            // If there are errors, copy the $errors array to $arr:

            $arr = $errors;
            return false;
        }

        // If the data is valid, sanitize all the data and copy it to $arr:

        foreach($data as $k=>$v){
            $arr[$k] = mysql_real_escape_string($v);
        }

        // Ensure that the email is lower case:

        $arr[\'email\'] = strtolower(trim($arr[\'email\']));

        return true;

    }

    private static function validate_text($str)
    {
        /*
        /   This method is used internally as a FILTER_CALLBACK
        */

        if(mb_strlen($str,\'utf8\')<1)
            return false;

        // Encode all html special characters (<, >, \", & .. etc) and convert
        // the new line characters to <br> tags:

        $str = nl2br(htmlspecialchars($str));

        // Remove the new line characters that are left
        $str = str_replace(array(chr(10),chr(13)),\'\',$str);

        return $str;
    }

}

?>

<?php

// Error reporting:
error_reporting(E_ALL^E_NOTICE);

include \"connect.php\";
include \"comment.class.php\";

/*
/   This array is going to be populated with either
/   the data that was sent to the script, or the
/   error messages.
/*/

$arr = array();
$validates = Comment::validate($arr);

if($validates)
{
    /* Everything is OK, insert to database: */

    mysql_query(\"   INSERT INTO comments(name,url,email,body)
                    VALUES (
                        \'\".$arr[\'name\'].\"\',
                        \'\".$arr[\'url\'].\"\',
                        \'\".$arr[\'email\'].\"\',
                        \'\".$arr[\'body\'].\"\'
                    )\");

    $arr[\'dt\'] = date(\'r\',time());
    $arr[\'id\'] = mysql_insert_id();

    /*
    /   The data in $arr is escaped for the mysql query,
    /   but we need the unescaped variables, so we apply,
    /   stripslashes to all the elements in the array:
    /*/

    $arr = array_map(\'stripslashes\',$arr);

    $insertedComment = new Comment($arr);

    /* Outputting the markup of the just-inserted comment: */

    echo json_encode(array(\'status\'=>1,\'html\'=>$insertedComment->markup()));

}
else
{
    /* Outputtng the error messages */
    echo \'{\"status\":0,\"errors\":\'.json_encode($arr).\'}\';
}

?>