上载文件并为其创建附件由函数处理media_handle_upload. 从源代码中可以看到，它首先上载文件，然后开始收集元数据（包括音频文件的一些冗长内容），然后调用wp_insert_attachment 创建附件帖子。没有一个地方你可以进去。

后一个函数只是wp_insert_post. 这里有很多钩子来过滤元数据。然而，只有一个条件阻止创建帖子，即if ( ! empty( $import_id ) ). 而且没有明显的方法可以搞乱$import_id. 所以，你被卡住了。

除了函数后面的一点调用之外：do_action( \'add_attachment\', $post_ID );. 这将在创建附件帖子后立即触发。您可以使用此选项再次立即删除帖子：

add_action (\'add_attachment\', \'wpse297026_delete_post\');
function wpse297026_delete_post ($post_ID) {
  wp_delete_post ($post_ID);
  }

我最终在自定义端点中使用了来自wp media端点的代码，而没有保存post部分。

以下是关于2017年儿童主题的完整示例，以防有人需要。

将此添加到函数中。php

$Custom_Media_Uploader = new Custom_Media_Uploader();
$Custom_Media_Uploader->init();

class Custom_Media_Uploader {

  function init() {
    add_action( \'rest_api_init\', [ $this, \'register_routes\' ] );

  }


  function register_routes() {
    $version   = \'1\';
    $namespace = \'custom-end-point/v\' . $version;
    $base      = \'media\';
    register_rest_route( $namespace, \'/\' . $base, array(
        [
            \'methods\'             => WP_REST_Server::CREATABLE,
            \'callback\'            => [ $this, \'upload_file\' ],
            \'permission_callback\' => [ $this, \'file_upload_permissions\' 
         ],
            \'args\'                => [],
        ]
    ) );
}

  function file_upload_permissions() {
    return is_user_logged_in();
  }

  function upload_file( $request ) {
    $params = $request->get_params();

    if ( ! empty( $request[\'post\'] ) && in_array( get_post_type( $request[\'post\'] ), array(
            \'revision\',
            \'attachment\'
        ), true )
    ) {
        return new WP_Error( \'rest_invalid_param\', __( \'Invalid parent type.\' ), array( \'status\' => 400 ) );
    }
  // Get the file via $_FILES or raw data.
    $files   = $request->get_file_params();
    $headers = $request->get_headers();
    if ( ! empty( $files ) ) {
        $file = $this->upload_from_file( $files, $headers );
    } else {
        $file = $this->upload_from_data( $request->get_body(), $headers );
    }
    if ( is_wp_error( $file ) ) {
        return $file;
    }
    $name       = basename( $file[\'file\'] );
    $name_parts = pathinfo( $name );
    $name       = trim( substr( $name, 0, - ( 1 + strlen( $name_parts[\'extension\'] ) ) ) );
    $url        = $file[\'url\'];
    $type       = $file[\'type\'];
    $file       = $file[\'file\'];

    return [ \'url\' => $url, \'type\' => $type ];
  }


/**
 * Handles an upload via multipart/form-data ($_FILES).
 *
 * @since 4.7.0
 *
 * @param array $files Data from the `$_FILES` superglobal.
 * @param array $headers HTTP headers from the request.
 *
 * @return array|WP_Error Data from wp_handle_upload().
 */
  protected function upload_from_file( $files, $headers ) {

    if ( empty( $files ) ) {
        return new WP_Error( \'rest_upload_no_data\', __( \'No data supplied.\' ), array( \'status\' => 400 ) );
    }
// Verify hash, if given.
    if ( ! empty( $headers[\'content_md5\'] ) ) {
        $content_md5 = array_shift( $headers[\'content_md5\'] );
        $expected    = trim( $content_md5 );
        $actual      = md5_file( $files[\'file\'][\'tmp_name\'] );
        if ( $expected !== $actual ) {
            return new WP_Error( \'rest_upload_hash_mismatch\', __( \'Content hash did not match expected.\' ), array( \'status\' => 412 ) );
        }
    }
  // Pass off to WP to handle the actual upload.
    $overrides = array(
        \'test_form\' => false,
    );
 // Bypasses is_uploaded_file() when running unit tests.
    if ( defined( \'DIR_TESTDATA\' ) && DIR_TESTDATA ) {
        $overrides[\'action\'] = \'wp_handle_mock_upload\';
    }
    /** Include admin functions to get access to wp_handle_upload() */
    require_once ABSPATH . \'wp-admin/includes/admin.php\';
    $file = wp_handle_upload( $files[\'file\'], $overrides );
    if ( isset( $file[\'error\'] ) ) {
        return new WP_Error( \'rest_upload_unknown_error\', $file[\'error\'], array( \'status\' => 500 ) );
    }

    return $file;
  }
}

在主题的根目录下创建一个名为page upload的文件。php

<?php get_header(); ?>
     <div class="wrap">
     <div id="primary" class="content-area">
      <main id="main" class="site-main" role="main">
        <input type=\'file\' onchange="uploadFile(this);"/>
        <div style="display:none" id="ajax-response">
            <div><b>File URL: </b><span id="file-url"></span></div>
            <div><b>File type: </b><span id="file-type"></span></div>
            <div></div>
        </div>
    </main><!-- #main -->
  </div><!-- #primary -->
</div><!-- .wrap -->

<script>
function uploadFile(input) {
    if (input.files && input.files[0]) {
        var file = input.files[0];
        var formData = new FormData();
        formData.append(\'file\', file);

        // Fire the request.
        jQuery.ajax({
            url: \'<?php echo esc_url_raw( rest_url() ) ?>custom-end-point/v1/media\',
            method: \'POST\',
            processData: false,
            contentType: false,
            beforeSend: function (xhr) {
                xhr.setRequestHeader(\'X-WP-Nonce\', \'<?php echo wp_create_nonce( \'wp_rest\' ) ?>\');
            },
            data: formData
        }).success(function (response) {
            jQuery(\'#file-url\').text(response.url);
            jQuery(\'#file-type\').text(response.type);
            jQuery(\'#ajax-response\').show();
            console.log(response);
        }).error(function (response) {
            console.log(response);
        });

    }
}
</script>

<?php get_footer();

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