WordPress上传图片时自动将图片重命名为文章标题

    function file_renamer( $filename ) {

    	$info = pathinfo( $filename );

    	$ext  = empty( $info['extension'] ) ? '' : '.' . $info['extension'];

    	$name = basename( $filename, $ext );

    	if( $post_id = array_key_exists( "post_id", $_POST) ? $_POST["post_id"] : null ) {

    		if($post = get_post($post_id)) {

    			return $post->post_title . $ext;

    		}

    	}

    	$my_image_title = $post;

    	$file['name'] = $my_image_title  . - uniqid() . $ext; // uniqid method

    	// $file['name'] = md5($name) . $ext; // md5 method

    	// $file['name'] = base64_encode( $name ) . $ext; // base64 method

    	return $filename;

    }

    add_filter( 'sanitize_file_name', 'file_renamer', 10, 1 );

    // 上传时自动设置图像标题、替代文本、标题和描述

    add_action( 'add_attachment', 'my_set_image_meta_upon_image_upload' );

    function my_set_image_meta_upon_image_upload( $post_ID ) {

    	// 检查上传的文件是否是图片

    	if ( wp_attachment_is_image( $post_ID ) ) {

    		if( isset( $_REQUEST['post_id'] ) ) {

    			$post_id = $_REQUEST['post_id'];

    		} else {

    			$post_id = false;

    		}

    		if ( $post_id != false ) {

    			$my_image_title = get_the_title( $post_id );

    		} else {

    			$my_image_title = get_post( $post_ID )->post_title;

    		}

    		// 清理标题中特殊字符

    		$my_image_title = preg_replace( '%\s*[-_\s]+\s*%', ' ',  $my_image_title );

    		// 将第一个字母大写

    		$my_image_title = ucwords( strtolower( $my_image_title ) );

    		// 创建包含标题、说明、描述的数组

    		$my_image_meta = array(

    			'ID'        => $post_ID,             // ID

    			'post_title'    => $my_image_title,  // 图像标题

    			'post_excerpt'  => $my_image_title,  // 图像说明

    			'post_content'  => $my_image_title,  // 图像描述

    		);

    		// 添加图像 Alt

    		update_post_meta( $post_ID, '_wp_attachment_image_alt', $my_image_title );

    		// 添加标题、说明、描述

    		wp_update_post( $my_image_meta );

    	}

    }