带验证码完整的WordPress非注册用户投稿功能

<?php the_content(); ?>
<!-- 关于表单样式，请自行调整-->
<form class="ludou-tougao" method="post" action="<?php echo $_SERVER["REQUEST_URI"]; $current_user = wp_get_current_user(); ?>">
<div style="text-align: left; padding-top: 10px;">
<label for="tougao_authorname">昵称:*</label>
<input type="text" size="40" value="<?php if ( 0 != $current_user->ID ) echo $current_user->user_login; ?>" id="tougao_authorname" name="tougao_authorname" />
</div>
<div style="text-align: left; padding-top: 10px;">
<label for="tougao_authoremail">E-Mail:*</label>
<input type="text" size="40" value="<?php if ( 0 != $current_user->ID ) echo $current_user->user_email; ?>" id="tougao_authoremail" name="tougao_authoremail" />
</div>
 
<div style="text-align: left; padding-top: 10px;">
<label for="tougao_authorblog">您的博客:</label>
<input type="text" size="40" value="<?php if ( 0 != $current_user->ID ) echo $current_user->user_url; ?>" id="tougao_authorblog" name="tougao_authorblog" />
</div>
<div style="text-align: left; padding-top: 10px;">
<label for="tougao_title">文章标题:*</label>
<input type="text" size="40" value="" id="tougao_title" name="tougao_title" />
</div>
<div style="text-align: left; padding-top: 10px;">
<label for="tougaocategorg">分类:*</label>
<?php wp_dropdown_categories('hide_empty=0&id=tougaocategorg&show_count=1&hierarchical=1'); ?>
</div>
 
<div style="text-align: left; padding-top: 10px;">
<label style="vertical-align:top" for="tougao_content">文章内容:*</label>
<textarea rows="15" cols="55" id="tougao_content" name="tougao_content"></textarea>
</div>
 
<br clear="all">
<div style="text-align: center; padding-top: 10px;">
<input type="hidden" value="send" name="tougao_form" />
<input type="submit" value="提交" />
<input type="reset" value="重填" />
</div>
</form>

<?php    
if( isset($_POST['tougao_form']) && $_POST['tougao_form'] == 'send') {
global $wpdb;
$current_url = 'http://你的投稿页面地址';   // 注意修改此处的链接地址
$last_post = $wpdb->get_var("SELECT `post_date` FROM `$wpdb->posts` ORDER BY `post_date` DESC LIMIT 1");
// 博客当前最新文章发布时间与要投稿的文章至少间隔120秒。
// 可自行修改时间间隔，修改下面代码中的120即可
// 相比Cookie来验证两次投稿的时间差，读数据库的方式更加安全
if ( current_time('timestamp') - strtotime($last_post) < 120 ) {
wp_die('您投稿也太勤快了吧，先歇会儿！<a href="'.$current_url.'">点此返回</a>');
}
 
// 表单变量初始化
$name = isset( $_POST['tougao_authorname'] ) ? trim(htmlspecialchars($_POST['tougao_authorname'], ENT_QUOTES)) : '';
$email =  isset( $_POST['tougao_authoremail'] ) ? trim(htmlspecialchars($_POST['tougao_authoremail'], ENT_QUOTES)) : '';
$blog =  isset( $_POST['tougao_authorblog'] ) ? trim(htmlspecialchars($_POST['tougao_authorblog'], ENT_QUOTES)) : '';
$title =  isset( $_POST['tougao_title'] ) ? trim(htmlspecialchars($_POST['tougao_title'], ENT_QUOTES)) : '';
$category =  isset( $_POST['cat'] ) ? (int)$_POST['cat'] : 0;
$content =  isset( $_POST['tougao_content'] ) ? trim(htmlspecialchars($_POST['tougao_content'], ENT_QUOTES)) : '';
 
// 表单项数据验证
if ( empty($name) || mb_strlen($name) > 20 ) {
wp_die('昵称必须填写，且长度不得超过20字。<a href="'.$current_url.'">点此返回</a>');
}
 
if ( empty($email) || strlen($email) > 60 || !preg_match("/^([a-z0-9/+_/-]+)(/.[a-z0-9/+_/-]+)*@([a-z0-9/-]+/.)+[a-z]{2,6}$/ix", $email)) {
wp_die('Email必须填写，且长度不得超过60字，必须符合Email格式。<a href="'.$current_url.'">点此返回</a>');
}
 
if ( empty($title) || mb_strlen($title) > 100 ) {
wp_die('标题必须填写，且长度不得超过100字。<a href="'.$current_url.'">点此返回</a>');
}
 
if ( empty($content) || mb_strlen($content) > 3000 || mb_strlen($content) < 100) {
wp_die('内容必须填写，且长度不得超过3000字，不得少于100字。<a href="'.$current_url.'">点此返回</a>');
}
 
$post_content = '昵称: '.$name.'<br />Email: '.$email.'<br />blog: '.$blog.'<br />内容:<br />'.$content;
 
$tougao = array(
'post_title' => $title,
'post_content' => $post_content,
'post_category' => array($category)
);
// 将文章插入数据库
$status = wp_insert_post( $tougao );
 
if ($status != 0) {
// 投稿成功给博主发送邮件
// somebody#example.com替换博主邮箱
// My subject替换为邮件标题，content替换为邮件内容
wp_mail("somebody#example.com","My subject","content");
wp_die('投稿成功！感谢投稿！<a href="'.$current_url.'">点此返回</a>', '投稿成功');
}
else {
wp_die('投稿失败！<a href="'.$current_url.'">点此返回</a>');
}
}

<br clear="all">

<div style="text-align: left; padding-top: 10px;">
<label for="CAPTCHA">验证码:
<input id="CAPTCHA" style="width:110px;*float:left;" class="input" type="text" tabindex="24" size="10" value="" name="captcha_code" /> 看不清？<a href="javascript:void(0)" onclick="document.getElementById('captcha_img').src='<?php bloginfo('template_url'); ?>/captcha/captcha.php?'+Math.random();document.getElementById('CAPTCHA').focus();return false;">点击更换</a>
</label>
</div>
 
<div style="text-align: left; padding-top: 10px;">
<label>
<img id="captcha_img" src="<?php bloginfo('template_url'); ?>/captcha/captcha.php" />
</label>
</div>
 
<br clear="all">

if( isset($_POST['tougao_form']) && $_POST['tougao_form'] == 'send') {

if (!isset($_SESSION)) {
session_start();
session_regenerate_id(TRUE);
}
 
if( isset($_POST['tougao_form']) && $_POST['tougao_form'] == 'send') {
if(empty($_POST['captcha_code'])
|| empty($_SESSION['ludou_lcr_secretword'])
|| (trim(strtolower($_POST['captcha_code'])) != $_SESSION['ludou_lcr_secretword'])
) {
wp_die('验证码不正确！<a href="'.$current_url.'">点此返回</a>');
}