WordPress代码实现防止发表重复标题的文章

直接看代码把：
/**

 * 发表文章时禁止与已存在的标题相重复

 * Modify from Plugin: Duplicate Title Validate

 * Description: this plugin help , not allow publish Duplicate Title . 

 * Author: hasan movahed

 * Reviser: INLOJV

 * Version: 1.0

 */
// 发表文章页面，前端抓取标题并使用AJAX发送请求

add_action( 'admin_print_footer_scripts', 'duplicate_titles_enqueue_scripts', 100 );

function duplicate_titles_enqueue_scripts() {

?>

<script>

jQuery(function($){




    function checkTitleAjax(title, id,post_type) {

        var data = {

            action: 'title_checks',

            post_title: title,

            post_type: post_type,

            post_id: id

        };

        $.post(ajaxurl, data, function(response) {

            $('#message').remove();

            $('#poststuff').prepend('<div id=\"message\" class=\"updated below-h2 fade \"><p>'+response+'</p></div>');

        }); 

    };

    $('#title').change(function() {

        var title = $('#title').val();

        var id = $('#post_ID').val();

        var post_type = $('#post_type').val();

        checkTitleAjax(title, id,post_type);

    });

 

});

</script>

<?php

}

    

 

 

// 接收前端ajax参数

add_action('wp_ajax_title_checks', 'duplicate_title_checks_callback');

function duplicate_title_checks_callback(){ 

    global $wpdb;            

    $title = $_POST['post_title'];

    $post_id = $_POST['post_id']; 

    $titles = "SELECT post_title FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post'

                AND post_title = '{$title}' AND ID != {$post_id} "; 

    $results = $wpdb->get_results($titles); 

    if($results) {

        echo "<span style='color:red'>". _( '此标题已存在，请换一个标题！' , '' ) ." </span>";

    } else {

        echo '<span style="color:green">'._('恭喜，此标题未与其他文章标题重复！' , '').'</span>';

    } 

    die();

}

 

// 检测后端标题并且避免同名文章更新草稿

add_action( 'publish_post','duplicate_titles_wallfa_bc' ) ;

function duplicate_titles_wallfa_bc( $post ){

    global $wpdb ;

    $title = $_POST['post_title'] ;

    $post_id = $post ; 

    $wtitles = "SELECT post_title FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post'

                        AND post_title = '{$title}' AND ID != {$post_id} " ; 

    $wresults = $wpdb->get_results( $wtitles ) ; 

    if ( $wresults ){

        $wpdb->update( $wpdb->posts, array( 'post_status' =>

                'draft' ), array( 'ID' => $post ) ) ;

        $arr_params = array( 'message' => '10', 'wallfaerror' => '1' )  ;      

        $location = add_query_arg( $arr_params , get_edit_post_link( $post , 'url' ) ) ;

        wp_redirect( $location  ) ;        

        exit ;

    }

}

 

 

 

/// 文章提交更新后的提示

add_action( 'admin_notices', 'not_published_error_notice' );   

function not_published_error_notice() {

    if(isset($_GET['wallfaerror']) == 1 ){

       ?>

       <div class="updated">

       <p style='color:red' ><?php _e('貌似已经存在相同标题的文章，若您使用了文章别名作为固定链接，则可以通过修改本文的固定链接来使标题不再重复！' , '') ?></p>

       </div>

       <?php

    }

}










// 禁用自动保存

add_action( 'wp_print_scripts', 'disable_autosave' ) ;

function disable_autosave(){

    wp_deregister_script( 'autosave' ) ;

}