Francis Crossen

(Sorry, here is the properly formatted code – wouldn’t a POST preview function be great?!)

By the way: once my plugin page is flagged in the $wp_query object, I then use the ‘the_posts’ filter to see if $wp_query->get(‘my_plugin_page_is_called’) is set. I can then override:
$posts[0]->post_title and $posts[0]->post_content with my own content.

function my_plugin_query_parser( $q ) {

$the_page_name = get_option( "my_plugin_page_name" );
$the_page_id = get_option( 'my_plugin_page_id' );

$qv = $q->query_vars;

// have we NOT used permalinks...?
if( !$q->did_permalink AND ( isset( $q->query_vars['page_id'] ) ) AND ( intval($q->query_vars['page_id']) == $the_page_id ) ) {

$q->set('my_plugin_page_is_called', TRUE );
return $q;

}
elseif( isset( $q->query_vars['pagename'] ) AND ( ($q->query_vars['pagename'] == $the_page_name) OR ($_pos_found = strpos($q->query_vars['pagename'],$the_page_name.'/') === 0) ) ) {

$q->set('my_plugin_page_is_called', TRUE );
return $q;

}
else {

$q->set('my_plugin_page_is_called', FALSE );
return $q;

}

}
add_filter( 'parse_query', 'my_plugin_query_parser' );

It all works fine, but I am also wondering if this is the ‘correct’ way of doing things.

Francis.

This is something I just did too in the past few days. This is my first venture into the WordPress plugin world and I based the basics on:

https://corpocrat.com/2009/12/27/tutorial-how-to-write-a-wordpress-plugin/

In the main plugin file:

/* Runs when plugin is activated */
register_activation_hook(__FILE__,'my_plugin_install'); 

/* Runs on plugin deactivation*/
register_deactivation_hook( __FILE__, 'my_plugin_remove' );

Then:

function my_plugin_install() {

    global $wpdb;

    $the_page_title = 'Whatever You Want';
    $the_page_name = 'whatever-you-want';

    // the menu entry...
    delete_option("my_plugin_page_title");
    add_option("my_plugin_page_title", $the_page_title, '', 'yes');
    // the slug...
    delete_option("my_plugin_page_name");
    add_option("my_plugin_page_name", $the_page_name, '', 'yes');
    // the id...
    delete_option("my_plugin_page_id");
    add_option("my_plugin_page_id", '0', '', 'yes');

    $the_page = get_page_by_title( $the_page_title );

    if ( ! $the_page ) {

        // Create post object
        $_p = array();
        $_p['post_title'] = $the_page_title;
        $_p['post_content'] = "This text may be overridden by the plugin. You shouldn't edit it.";
        $_p['post_status'] = 'publish';
        $_p['post_type'] = 'page';
        $_p['comment_status'] = 'closed';
        $_p['ping_status'] = 'closed';
        $_p['post_category'] = array(1); // the default 'Uncatrgorised'

        // Insert the post into the database
        $the_page_id = wp_insert_post( $_p );

    }
    else {
        // the plugin may have been previously active and the page may just be trashed...

        $the_page_id = $the_page->ID;

        //make sure the page is not trashed...
        $the_page->post_status = 'publish';
        $the_page_id = wp_update_post( $the_page );

    }

    delete_option( 'my_plugin_page_id' );
    add_option( 'my_plugin_page_id', $the_page_id );

}

function my_plugin_remove() {

    global $wpdb;

    $the_page_title = get_option( "my_plugin_page_title" );
    $the_page_name = get_option( "my_plugin_page_name" );

    //  the id of our page...
    $the_page_id = get_option( 'my_plugin_page_id' );
    if( $the_page_id ) {

        wp_delete_post( $the_page_id ); // this will trash, not delete

    }

    delete_option("my_plugin_page_title");
    delete_option("my_plugin_page_name");
    delete_option("my_plugin_page_id");

}

I then sniff my page by hooking into the ‘parse_query’ filter…

`
function my_plugin_query_parser( $q ) {

$the_page_name = get_option( “my_plugin_page_name” );
$the_page_id = get_option( ‘my_plugin_page_id’ );

$qv = $q->query_vars;

// have we NOT used permalinks…?
if( !$q->did_permalink AND ( isset( $q->query_vars[‘page_id’] ) ) AND ( intval($q->query_vars[‘page_id’]) == $the_page_id ) ) {

$q->set(‘my_plugin_page_is_called’, TRUE );
return $q;

}
elseif( isset( $q->query_vars[‘pagename’] ) AND ( ($q->query_vars[‘pagename’] == $the_page_name) OR ($_pos_found = strpos($q->query_vars[‘pagename’],$the_page_name.’/’) === 0) ) ) {

$q->set(‘my_plugin_page_is_called’, TRUE );
return $q;

}
else {

$q->set(‘my_plugin_page_is_called’, FALSE );
return $q;

}

}
add_filter( ‘parse_query’, ‘my_plugin_query_parser’ );