这是我第一次用面向对象的方式构建元框，问题是当我保存帖子（产品）或更新它时，输入的文本没有保存到数据库中。这是我的代码：
<?php
/**
*
*/
class Custom_Meta_Boxes{
public function __construct(){
add_action( \'add_meta_boxes\', array( $this, \'iam_add_meta_box\' ) );
add_action( \'save_post\', array( $this, \'iam_save_meta_box_data\' ) );
}
/**
* Adds a meta box to the post editing screen
*/
public function iam_add_meta_box(){
add_meta_box(
\'custom_meta_box\',
__( \'Meta Box Title\', \'iamtheme\' ),
array( $this, \'iam_display_custom_meta_box\' ),
\'post\',
\'normal\',
\'high\'
);
}
/**
* Render Meta Box content.
*/
public function iam_display_custom_meta_box() {
$html = \'\';
// Add an nonce field so we can check for it later.
wp_nonce_field( \'iam_nonce_check\', \'iam_nonce_check_value\' );
$html = \'<label for="link-text" class="prfx-row-title">Link: </label>\';
$html .= \'<input type="text" name="link-text" id="link-text" value="\' . get_post_meta( get_the_ID(), \'link-text\', true ) . \'" placeholder="Enter your link here." />\';
echo $html;
}
/**
* Save the meta when the post is saved.
*/
public function iam_save_meta_box_data( $post_id ){
var_dump( $post_id );
if ( $this->iam_user_can_save( $post_id, \'iam_nonce_check_value\' ) ){
// Checks for input and sanitizes/saves if needed
if( isset( $_POST[ \'link-text\' ] ) && 0 < count( strlen( trim( $_POST[\'link-text\'] ) ) ) ) {
update_post_meta( $post_id, \'link-text\', sanitize_text_field( $_POST[ \'link-text\' ] ) );
}
}
}
/**
* Determines whether or not the current user has the ability to save meta
* data associated with this post.
*
* @param int $post_id The ID of the post being save
* @param bool Whether or not the user has the ability to save this post.
*/
public function iam_user_can_save( $post_id, $nonce ){
var_dump( $post_id );
// Checks save status
$is_autosave = wp_is_post_autosave( $post_id );
$is_revision = wp_is_post_revision( $post_id );
$is_valid_nonce = ( isset( $_POST[ $nonce ] ) && wp_verify_nonce( $_POST[ $nonce ], \'iam_nonce_check\' ) ) ? \'true\' : \'false\';
// Return true if the user is able to save; otherwise, false.
if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
return;
}
}
}
// Instantiate theme
if ( class_exists( \'Custom_Meta_Boxes\' ) ){
$i_am = new Custom_Meta_Boxes();
}
?>
请告诉我这个代码有什么问题。
最合适的回答,由SO网友:cybmeta 整理而成
You方法iam_user_can_save 使用错误，因为您没有返回任何内容来签入该方法。试试这个（不确定您真正想要什么行为，下面的代码只是您代码中的一个工作示例）：
public function iam_user_can_save( $post_id, $nonce ){
// Checks save status
$is_autosave = wp_is_post_autosave( $post_id );
$is_revision = wp_is_post_revision( $post_id );
$is_valid_nonce = ( isset( $_POST[ $nonce ] ) && wp_verify_nonce( $_POST[ $nonce ], \'iam_nonce_check\' ) ) ? \'true\' : \'false\';
if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
return false;
}
return true;
}
