Change page title from plugin

Is possible to change page title on the fly from plugin?

I’ve try global $post, but seem like plugin runs after.

Any Ideas?

Edit:
Im writting some pages on the fly, based on same page / post, so every page show the same title.
Looking a way to do via shortcode or writting my own plugin/function

Answers:

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Method 1

There’s a filter for that:

function wpse_alter_title( $title, $id )
{
    // $id = $post->ID;
    // alter the title here
    return $title;
}

If you want to alter the “Protected” and “Private” titles, then you need other filters:

// Preserve the "%s" - else the title will be removed.
function wpse_alter_protected_title_format( $title )
{
    return __( 'Protected: %s' );
}

function wpse_alter_private_title_format( $title )
{
    return __( 'Private: %s' );
}

Last but not least, you must add your filter callbacks early enough.

function wpse_load_alter_title()
{
    add_filter( 'the_title', 'wpse_alter_title', 20, 2 );
    add_filter( 'protected_title_format', 'wpse_alter_protected_title_format' );
    add_filter( 'private_title_format', 'wpse_alter_private_title_format' );
}
add_action( 'init', 'wpse_load_alter_title' );

Method 2

This depends on the context your page title is being rendered in and how the data is being fed into it.

Consider the following:

<h2><?php the_title(); ?></h2>

Solution would involve hooking to the the_title filter and alter it in a breeze.

How about this?

<h2><?php echo $post->post_title; ?></h2> // not nice!

And it’s not nice due to the problems with altering it. It’s hard to know how the $post got populated in the first place. Consider:

foreach( get_posts( ... ) as $post ):
    ...

No place to hook there, at first glance. But it can be done inside the actual posts query. Check out the found_posts filter.

However, consider the following:

$post = $wpdb->get_row( "SELECT .... " );
echo "<h2>$post->post_title</h2>"

That’s insane.

Point is, depending on your situation there’s probably a good solution. Check the template file, see how the title is being rendered. Fix it to be comfortable or make your plugin work a little harder.

And you will never ever be able to alter the title via a plugin if mysql_query() is used directly to retrieve the title. Yes, I’ve actually seen this done. Some people go as far as hard code it in the template even. Like front-page.php will contain <h2>Home</h2> and never even use the $post->post_title or ever query the database.

So, depends on the context and the situation.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0