事实上，所有插件后端代码都等同于将代码片段添加到functions.php中，functions.php代码片段可以生成插件，然后插件可以自然地集成到functions.php中。插件主要易于管理，但也增加了静态资源请求的数量。如果您知道如何处理这些请求，就不必使用插件来优化站点。WordPress网站发布文章时如何防止发布重复标题的文章？
主要的修改地方是： js 转为 script 标签内容，等于删除一个请求，翻译也被保存，用中文代替。把下面的代码复制并粘贴到你的主题的functions.php文件中。
/**
* 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’ ) ;
}
