我使用a frontend form 由@TheDeadMedic发布常规帖子。我知道了如何在这个表单中添加一个类别和一个位置（自定义分类法）下拉菜单，以及如何清理和验证它们，最后，如何用这些新信息保存帖子。但是I cannot save a second location input value as a post meta. 我知道add_post_meta() 函数，但我不明白如何在前面提到的前端表单的上下文中使用它。有什么帮助吗？
我的自定义前端表单：
<?php
/*
* Plugin Name: Submit From Front
* Plugin URI:
* Description: This creates a form so that posts can be submitted from the front end.
* Version: 0.1
* Author: TheDeadMedic
* Author URI:
* Text Domain: submit-from-front
*/
class WPSE_Submit_From_Front {
const NONCE_VALUE = \'front_end_new_post\';
const NONCE_FIELD = \'fenp_nonce\';
protected $pluginPath;
protected $pluginUrl;
protected $errors = array();
protected $data = array();
function __construct() {
$this->pluginPath = plugin_dir_path( __file__ );
$this->pluginUrl = plugins_url( \'\', __file__ );
add_action( \'wp_enqueue_scripts\', array( $this, \'addStyles\' ) );
add_shortcode( \'post_from_front\', array( $this, \'shortcode\' ) );
}
function addStyles() {
//wp_enqueue_style( \'submitform-style\', "$this->pluginUrl/submitfromfront.css" );
}
/**
* Shortcodes should return data, NOT echo it.
*
* @return string
*/
function shortcode() {
if ( ! current_user_can( \'publish_posts\' ) )
return sprintf( \'<p>Please <a href="%s">login</a> to post adverts.</p>\', esc_url( wp_login_url( get_permalink() ) ) );
elseif ( $this->handleForm() )
return \'<p class="success">Nice one, post created!</p>\';
else
return $this->getForm();
}
/**
* Process the form and return true if post successfully created.
*
* @return bool
*/
function handleForm() {
if ( ! $this->isFormSubmitted() )
return false;
// http://php.net/manual/en/function.filter-input-array.php
$data = filter_input_array( INPUT_POST, array(
\'postTitle\' => FILTER_DEFAULT,
\'postContent\' => FILTER_DEFAULT,
\'postCategory\' => FILTER_DEFAULT,
\'postLocation\' => FILTER_DEFAULT,
\'postLocation2\' => FILTER_DEFAULT,
));
$data = wp_unslash( $data );
$data = array_map( \'trim\', $data );
// You might also want to more aggressively sanitize these fields
// By default WordPress will handle it pretty well, based on the current user\'s "unfiltered_html" capability
$data[\'postTitle\'] = sanitize_text_field( $data[\'postTitle\'] );
$data[\'postContent\'] = wp_check_invalid_utf8( $data[\'postContent\'] );
$data[\'postCategory\'] = sanitize_text_field( $data[\'postCategory\'] );
$data[\'postLocation\'] = sanitize_text_field( $data[\'postLocation\'] );
$data[\'postLocation2\'] = sanitize_text_field( $data[\'postLocation2\'] );
$this->data = $data;
if ( ! $this->isNonceValid() )
$this->errors[] = \'Security check failed, please try again.\';
if ( ! $data[\'postTitle\'] )
$this->errors[] = \'Please enter a title.\';
if ( ! $data[\'postContent\'] )
$this->errors[] = \'Please enter the content.\';
if ( ! $data[\'postCategory\'] )
$this->errors[] = \'Please select a category.\';
if ( ! $data[\'postLocation\'] )
$this->errors[] = \'Please select a location.\';
if ( ! $this->errors ) {
$post_id = wp_insert_post( array(
\'post_title\' => $data[\'postTitle\'],
\'post_content\' => $data[\'postContent\'],
\'post_category\' => array( $data[\'postCategory\'] ),
\'tax_input\' => array(\'loc\' => array( $data[\'postLocation\'] )),
\'post_status\' => \'publish\',
));
if ( ! $post_id )
$this->errors[] = \'Whoops, please try again.\';
} else {
$post_id = 0;
}
return ( bool ) $post_id;
}
/**
* Use output buffering to *return* the form HTML, not echo it.
*
* @return string
*/
function getForm() {
ob_start();
?>
<div id ="frontpostform">
<?php foreach ( $this->errors as $error ) : ?>
<p class="error"><?php echo $error ?></p>
<?php endforeach ?>
<form id="formpost" method="post">
<fieldset>
<label for="postTitle">Post Title</label>
<input type="text" name="postTitle" id="postTitle" value="<?php
// "Sticky" field, will keep value from last POST if there were errors
if ( isset( $this->data[\'postTitle\'] ) )
echo esc_attr( $this->data[\'postTitle\'] );
?>" />
</fieldset>
<fieldset>
<label for="postContent">Content</label>
<textarea name="postContent" id="postContent" rows="10" cols="35" ><?php
if ( isset( $this->data[\'postContent\'] ) )
echo esc_textarea( $this->data[\'postContent\'] );
?></textarea>
</fieldset>
<!-- Category -->
<fieldset>
<label for="postCategory">Category</label>
<select name="postCategory">
<option value=""><?php echo esc_attr(__(\'Select Category\')); ?></option>
<?php
$categories = get_categories( \'hide_empty=0\' );
foreach ($categories as $category) {
// keep post category value from last POST if there were errors
if ( isset( $this->data[\'postCategory\'] ) && $this->data[\'postCategory\'] == $category->cat_ID ) {
$option = \'<option value="\' . $category->cat_ID . \'" selected="selected">\';
} else {
$option = \'<option value="\' . $category->cat_ID . \'">\';
}
$option .= $category->cat_name;
$option .= \' (\'.$category->category_count.\')\';
$option .= \'</option>\';
echo $option;
}
?>
</select>
</fieldset>
<!-- Location -->
<fieldset>
<label for="postLocation">Location</label>
<select name="postLocation">
<option value=""><?php echo esc_attr(__(\'Select Location\')); ?></option>
<?php
$categories = get_terms( \'loc\', \'hide_empty=0\' );
foreach ($categories as $category) {
if ( isset( $this->data[\'postLocation\'] ) && $this->data[\'postLocation\'] == $category->term_id ) {
$option = \'<option value="\' . $category->term_id . \'" selected="selected">\';
} else {
$option = \'<option value="\' . $category->term_id . \'">\';
}
$option .= $category->name;
$option .= \' (\'.$category->count.\')\';
$option .= \'</option>\';
echo $option;
}
?>
</select>
</fieldset>
<!-- Second Location -->
<fieldset>
<label for="postLocation2">Location 2</label>
<input type="text" name="postLocation2" id="postLocation2" value="<?php
// "Sticky" field, will keep value from last POST if there were errors
if ( isset( $this->data[\'postLocation2\'] ) )
echo esc_attr( $this->data[\'postLocation2\'] );
?>" />
</fieldset>
<fieldset>
<button type="submit" name="submitForm" >Create Post</button>
</fieldset>
<?php wp_nonce_field( self::NONCE_VALUE , self::NONCE_FIELD ) ?>
</form>
</div>
<?php
return ob_get_clean();
}
/**
* Has the form been submitted?
*
* @return bool
*/
function isFormSubmitted() {
return isset( $_POST[\'submitForm\'] );
}
/**
* Is the nonce field valid?
*
* @return bool
*/
function isNonceValid() {
return isset( $_POST[ self::NONCE_FIELD ] ) && wp_verify_nonce( $_POST[ self::NONCE_FIELD ], self::NONCE_VALUE );
}
}
new WPSE_Submit_From_Front;
