“Cannot modify header information” means I can’t use wp_redirect

As Milo stated, you can’t send header information after PHP has begun sending request response body. Redirects belong in a function hooked into wp_loaded to ensure they run before the request body is generated. You need something like the following in your functions.php file: function hook_wp_loaded_require_login() { $uri = ( isset( $_SERVER[‘REQUEST_URI’] ) ) ? … Read more

Does wordpress templates always in files or in database?

But there is no content directory in template directory. Actually, with the following: get_template_part( ‘templates/content’, ‘header-private’ ); get_template_part( ‘templates/content’, ‘header-public’ ); WordPress will search in the templates folder for content-header-private.php or content-header-public.php, and if found, it is loaded. Else, WordPress will attempt to load the content.php file instead. So WordPress (or get_template_part()) will not search … Read more

Know which plugin is calling JS in wp_head()?

Plugins and themes tend to use wp_enqueue_script() to queue up scripts for the <head /> of your theme. I would rarely advise this, but since you only need to do it temporarily, you could modify WordPress core and run a debug backtrace for every call to this function. In wp-includes/functions.wp-scripts.php, drop the following code inside … Read more

‘Headers already sent’ Error When Redirecting from add_submenu_page() Callback

Background The infamous “Headers already sent” error rears it’s ugly head in circumstances where something attempts to modify the HTTP headers for the server’s response after they have already been dispatched to the browser – that is to say, when the server should only be generating the body of the response. This often happens in … Read more

add styles if custom header was included

get_header has an action hook called, (surprise!) get_header which gets a single parameter – the name of the header file. So what we do is check that name and if it matches our name we add a style. So something like this: add_action( ‘get_header’, ‘wpse_260353_add_css_for_header’ ); function wpse_260353_add_css_for_header( $name ){ if( ‘modern’ === $name ){ … Read more

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