Small modification to plugin WordPress
- SOLVED
Hello
I have this plugin that adds http headers:
<?php
add_action( 'send_headers', 'meadow_stop' );
function meadow_stop() {
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
This plugin works fine. But it adds the headers to all pages.
I want to change it so it only adds the headers on pages in category X.
So something like: if ( in_category('x') ) {}
But this doesn't work. Can you fix it?
Answers (7)
Hiro Hito answers:
<?php
add_action( 'send_headers', 'meadow_stop' );
function meadow_stop() {
if ( in_category( 'X' ) ) {
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
}
jimbob comments:
Sorry, but that does not work
Hiro Hito comments:
add_action( 'send_headers', 'meadow_stop' );
function meadow_stop() {
$cat = get_query_var('cat');
if ( $cat == '75' ) {
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
}
try this, just replace '75' with category ID
jimbob comments:
No, this doesn't work either.
Francisco Javier Carazo Gil answers:
Good evening,
The problem here is: the action is executed to soon so you have to work directly with the query.
So we have:
add_action( 'send_headers', 'meadow_stop', 10, 1 );
function meadow_stop( $object ) {
if( $object->query_vars['category_name'] != "category_X" )
return;
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
jimbob comments:
This is the closest answer so far.
But it adds the headers to the category archive page, not to the posts in that category.
I don't want the headers on the category archive page.
I only want to add the headers on posts in category X.
Francisco Javier Carazo Gil comments:
Ok, I understood bad.
So what you want is something like it:
if( !isset( $object->query_vars['p'] ) )
return;
$post_id = $object->query_vars['p'];
if( !in_category( $category, $post_id ) )
return;
jimbob comments:
I'm sorry, can you tell me the complete code?
I tried this (category name: catx) and it didn't work:
add_action( 'send_headers', 'meadow_stop', 10, 1 );
function meadow_stop( $object ) {
if( !isset( $object->query_vars['catx'] ) )
return;
$post_id = $object->query_vars['catx'];
if( !in_category( $category, $post_id ) )
return;
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
Francisco Javier Carazo Gil comments:
It cannot work because "catx" is not a query var :s
Sorry I though you knew a little more about it. p is correct, p is the ID.
Change $category var for the one you want to use: the category slug.
if( !isset( $object->query_vars['p'] ) )
return;
$post_id = $object->query_vars['p'];
if( !in_category( $category, $post_id ) )
return;
jimbob comments:
Hello,
Category name is quiz, so I used this code:
But it didn't work.
<?php
/*
Plugin Name: test
Plugin URI:
Description: test
Version: 1.0
Author:
Author URI:
License:
License URI:
*/
add_action( 'send_headers', 'meadow_stop', 10, 1 );
function meadow_stop( $object ) {
if( !isset( $object->query_vars['p'] ) )
return;
$post_id = $object->query_vars['p'];
if( !in_category( quiz, $post_id ) )
return;
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
jimbob comments:
tried this too:
<?php
/*
Plugin Name: test
Plugin URI:
Description: test
Version: 1.0
Author:
Author URI:
License:
License URI:
*/
add_action( 'send_headers', 'meadow_stop', 10, 1 );
function meadow_stop( $object ) {
if( !isset( $object->query_vars['p'] ) )
return;
$post_id = $object->query_vars['p'];
if( !in_category( 'quiz', $post_id ) )
return;
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
Francisco Javier Carazo Gil comments:
Maybe your permalink structure or the query vars is not working as we would like.
I would need to look into the system... but it would take more than this price.
mod mi answers:
Hello, try this:
add_action( 'send_headers', 'meadow_stop' );
function meadow_stop() {
global $post;
if ( in_category ( 'x', $post->ID ) ) {
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
}
jimbob comments:
Does not work
Krishna Tiwari answers:
HI Jimbob,
Please try bellow code. Its worked.
add_action( 'send_headers', 'meadow_stop' );
function meadow_stop() {
$catid = 3; // Replace cat id according your requirement
if (check_category_exists( $catid )){
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
}
function check_category_exists($catid){
$cat_to_check = get_term_by( 'id', $catid, 'category');
if ($cat_to_check){
return true;
}
else{return false;}
}
jimbob comments:
This adds the headers to every post and page, not only to posts under category id 3
Rempty answers:
Hello jimbob
Do you want to add the headers on category pages or in posts with a category?
For send header in category pages
add_action( 'send_headers', 'meadow_stop' );
function meadow_stop() {
$category='1';
if(is_category($category)){
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
}
If you want to add headers in posts with a category XYZ
add_action( 'send_headers', 'meadow_stop2' );
function meadow_stop2() {
global $post;
$category=1;
$taxonomy='category';
if(has_term($category,$taxonomy,$post)){
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
}
jimbob comments:
Doesn't work
Krishna Tiwari comments:
Hi,
You want header only on post detail page (single.php), if given category belongs. Is right?
Rempty comments:
Hey jimbob
You can't use the send_headers because the query object was not created
instead use this code
add_action('template_redirect', 'add_last_modified_header');
function add_last_modified_header() {
if( is_singular() ) {
$category=7;
$taxonomy='category';
$post_id = get_queried_object_id();
if(has_term($category,$taxonomy,$post_id)){
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');
}
}
}