filtering the_category

I’ve use this before:

<?php
foreach((get_the_category()) as $category) {
    if ($category->cat_name != 'cat_to_exclude') {
    echo '<a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> ';
}
}
?>

MichaelH , thx a lot for you help , I see 2 times this code but … where I put the hide category ? I want to exclude the category with the ID number 204 ..

I try many test but nothin :/

Can you tell me where i write the ID , to exclude the category ? ??

thx alot

@nathanspike: Replace cat_to_exclude with the actual category ID that you want to exclude and the code should work.

How can you filter out more than one category?

@nathanspike: actually, you’ll have to edit the code slightly to exclude categories by ID. Code is as follows:

<?php
foreach((get_the_category()) as $category) {
    if ($category->cat_ID != '204') {
    echo '<a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> ';
}
}
?>

You need to change “cat_name” to “cat_ID” in order for it to exclude by ID #. I also changed cat_to_exclude to your ID # for ya. Hope that helps!

@sbruner: This probably isn’t the best way to do it, but the following works:

<?php
foreach((get_the_category()) as $category) {
    if ($category->cat_name != 'category1' &amp;&amp; $category->cat_name != 'category2') {
    echo '<a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> ';
}
}
?>

Be sure to replace && with && when you implement your code (WP forums won’t let me use ampersand inside code tags).

I was looking for some kind of solution like that. Thanks!

I find this solution here, I think it’s work well, and look like very clean!

code to add in the function.php in your theme folder:

function the_category_filter($thelist,$separator=' ') {
	if(!defined('WP_ADMIN')) {
		//Category IDs to exclude
		$exclude = array(1,5);

		$exclude2 = array();
		foreach($exclude as $c) {
			$exclude2[] = get_cat_name($c);
		}

		$cats = explode($separator,$thelist);
		$newlist = array();
		foreach($cats as $cat) {
			$catname = trim(strip_tags($cat));
			if(!in_array($catname,$exclude2))
				$newlist[] = $cat;
		}
		return implode($separator,$newlist);
	} else {
		return $thelist;
	}
}
add_filter('the_category','the_category_filter', 10, 2);

if you want to filter more than 2 category, you have to change the last number in the last line of the cove above

take a look here for the add_filter reference