有没有一种方法可以通过上传前端文件来更新Wordpress中的自定义字段? [英] Is there a way to update a custom field in Wordpress with a front-end file upload?

问题描述

我正在尝试使用从前端表单上传的文件来更新自定义WordPress字段.

I am trying to update a custom WordPress-field with a file upload from a front-end form.

示例:

<form action="submit"><input type="file" name="file_upload"><button type="submit">Submit</button></form>

现在，我正在寻找php代码，以更新WordPress中具有特定ID的名为"file_upload"的自定义字段(文件上传).我使用的插件是高级自定义字段".

Now I am looking for the php code that updates the custom field (file upload) in WordPress named 'file_upload' of a post with a certain ID. The plugin I use is 'Advanced Custom Fields'.

我通过PhP中的$ _FILES请求获取文件:

I get the file via an $_FILES request in PhP:

$file_upload = $_FILES['file_upload'];

然后我尝试通过这种方法处理上传:

Then I try to handle the upload via this method:

$file_upload_id = media_handle_upload( $file_upload, 0 );

这是正确的方法吗?

推荐答案

Wordpress具有内置上传功能，该功能返回您需要更新字段的附件ID，建议使用随机数字段来验证其正确位置.

Wordpress has a build in upload function that returns the attachment id you need to update the field, its recommended to use a nonce field to verify it's the right place.

    if ( 
        isset( $_POST['my_image_upload_nonce'], $_POST['post_id'] ) 
        && wp_verify_nonce( $_POST['my_image_upload_nonce'], 'my_image_upload' )
    ) {
        require_once( ABSPATH . 'wp-admin/includes/image.php' );
        require_once( ABSPATH . 'wp-admin/includes/file.php' );
        require_once( ABSPATH . 'wp-admin/includes/media.php' );
        $attachment_id = media_handle_upload( 'my_image_upload', $_POST['post_id'] );
        if ( is_wp_error( $attachment_id ) ) {
            update_field('image', $attachment_id, $_POST['post_id']);
        } else {
       // The image was uploaded successfully!
    }

    } else {

    // The security check failed, maybe show the user an error.
    }

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