No, this is not a correct use for ob_start(). You’re getting the warning because your script is outputting code before the page headers are sent – meaning you’re printing output before the html page.
Without knowing what’s going on in your // other plugin code it’s difficult to say what’s happening exactly. I would guess you’re calling plugin_rvce_options_page() somewhere in the root of the functions.php file instead of in a function that outputs to an admin page. In any case, try and fix the issue and don’t use ob_start() as a work-around.
Related Posts:
- WordPress Plugin Development – Headers Already Sent Message
- Clarity needed on usage of multiple 403 forbidden header() functions at the beginning of the plugin files
- Headers already sent error with CSV export plugin
- Get file headers in custom file
- Adding custom code into header.php using a plugin
- How can I change HTTP headers only to posts of a specific category from a plugin
- The plugin generated 80 characters of unexpected output!
- Cannot modify header information – headers already sent by pluggable.php
- Header Button Chance Polylang Elementor
- An echo line in a transition_post_status action leads to “cannot modify header information – headers already sent by”
- Proper way to pass credentials in a custom login form to avoid “headers already sent”
- Serve text/html from wp-json API via WPEngine, headers not being set properly
- How to give a download link to a .csv file from the custom plugin?
- Adding custom stylesheet into header.php using a plugin
- Need Help Determining Where Header Error is Happening
- Why does website stretch and white space on load? [duplicate]
- Downloading File via headers doesnt work
- WordPress Favicon not Working For Images/Videos/PDFs
- Two same AJAX calls – one is working, other doesn’t
- Some data has already been output, can’t send PDF file – fpdf issue in WordPress
- Headers already sent on custom plugin (Export function)
- How to force download a plugin generated file?
- Why is there a bunch of WordPress HTML code in my browser CSV download?
- Objective Best Practices for Plugin Development? [closed]
- add_menu_page() with different name for first submenu item
- Autoloading & Namespaces in WordPress Plugins & Themes: Can it Work?
- How to include PHP files in plugins the correct way
- How can I add an image upload field directly to a custom write panel?
- A tool to analyze rewrite rules? [closed]
- Difference Between Filter and Action Hooks?
- framework for plugin/theme options panel? [closed]
- Creating a table in the admin-style?
- How can you check if you are in a particular page in the WP Admin section? For example how can I check if I am in the Users > Your Profile page?
- Settings API with arrays example
- How to get the path to the current theme?
- How to make a plugin require another plugin?
- ajaxurl not defined on front end
- What process do you use for WordPress development? [closed]
- What’s the difference between term_id and term_taxonomy_id
- Should I use wpdb prepare?
- Why does WordPress use outdated jQuery v1.12.4?
- Post meta vs separate database tables
- Is there any plugin development framework
- Is it possible to reuse wp.media.editor Modal for dialogs other than media
- How to add a javascript snippet to the footer that requires jQuery
- Enhance Media Manager for Gallery
- How do I create a custom role capability?
- How do I add CSS options to my plugin without using inline styles?
- How do i best handle custom plugin page actions?
- Adding Custom Text Patterns in the WP 4.5 Visual Editor
- Automatically determine minimum WordPress version required for a plugin?
- What is the advantage of using wp_mail?
- How to make a WordPress plugin translation ready?
- How many times will this code run? (or, how rich is grandma?)
- How to create an API for my plugin?
- Is it ever okay to include inline CSS in plugins?
- Plugins in symlinked directories?
- How to override existing plugin action with new action
- How to include a file using get_template_part() in a plugin?
- Add custom TinyMCE 4 Button, Usable since WordPress 3.9-beta1
- How to store username and password to API in wordpress option DB?
- body_class hook for admin pages
- “Error: Options Page Not Found” on Settings Page Submission for an OOP Plugin
- Is it mandatory to use $wpdb->prefix in custom tables
- Which hook should be used to add an action containing a redirect?
- add_action hook for completely new post?
- Why does WordPress add 0 (zero) to an Ajax response?
- What should I use instead of WP_CONTENT_DIR and WP_PLUGIN_DIR?
- How to enqueue JavaScripts in a plugin
- In Which Contexts are Plugins Responsible for Data Validation/Sanitization?
- Plugin Form Submission Best Practice
- How to redirect to settings page once the plugin is activated?
- Is get_option function cached?
- Should Plugin Folders Include a Blank index.php File?
- Unit testing for plugin development
- Methods of Integrating Plugin Data with Themes
- What is the wordpress wp-includes folder for?
- WordPress Update Plugin Hook/Action? Since 3.9
- How to include jQuery and JavaScript files correctly?
- How come `wp_options` table does not have an index on `autoload`?
- PHP error with shortcode handler from a class
- Update Option Stored in Multi-Dimensional Array
- check if Gutenberg is currently in use
- Best way to abort plugin in case of insufficient PHP version?
- WP 3.3 How to Add Menu Items to the Admin Bar?
- dbDelta not creating tables
- Custom Widget function in Plugin not working?
- Passing arguments to a admin menu page callback?
- Single functions.php or split into many small files?
- Get page content using slug
- $_POST form request with admin-post
- How to fork a plugin?
- How can I configure Docker for developing and deploying a custom theme?
- How to include wp-load.php from any location?
- Correct way to enqueue jquery-ui
- Where to store PHP files created by plugin / themes
- How to echo the_excerpt without the P tag wrapper?
- How can I update a wordpress plugin from a Git repository (github)
- What are the advantages to the Settings API?
- Add screen options to custom admin pages