Custom wp_query function - search post content - php

Question

I have a php function that extends the default WP default search abilities (title & inside post content), it can now look in taxonomies / attributes too.
However, using the function results in the search query not looking inside post content, which is a feature I would like to retain. Would anyone be able to help tweak the below so the search still looks inside post content? Thank you
function and_extend_search( $search, &$wp_query ) {
global $wpdb;
if ( empty( $search ) ) {
return $search;
}
$terms = $wp_query->query_vars['s'];
$exploded = explode( ' ', $terms );
if ( $exploded === false || count( $exploded ) == 0 ) {
$exploded = array( 0 => $terms );
}
$search = '';
foreach ( $exploded as $tag ) {
$search .= " AND ( ($wpdb->posts.post_title LIKE '%$tag%') OR EXISTS ( SELECT * FROM $wpdb->term_relationships LEFT JOIN $wpdb->terms ON $wpdb->term_relationships.term_taxonomy_id = $wpdb->terms.term_id WHERE $wpdb->terms.name LIKE '%$tag%' AND $wpdb->term_relationships.object_id = $wpdb->posts.ID ) )";
}
return $search;
}

Answer 1

You have three errors here.
You put the parameter in your file as &$wp_query but you don't use this syntax in this case.
You clear out search $search = ''; before you try to concatenate it.
Your condition is AND instead of OR - Unless for some reason you're trying to limit it?
function and_extend_search( $search, $wp_query ) {
global $wpdb;
if ( empty( $search ) ) {
return $search;
}
$terms = $wp_query->query_vars['s'];
$exploded = explode( ' ', $terms );
if ( false === $exploded || 0 === count( $exploded ) ) {
$exploded = array( 0 => $terms );
}
foreach ( $exploded as $tag ) {
$search .= " OR ( ($wpdb->posts.post_title LIKE '%$tag%') OR EXISTS ( SELECT * FROM $wpdb->term_relationships LEFT JOIN $wpdb->terms ON $wpdb->term_relationships.term_taxonomy_id = $wpdb->terms.term_id WHERE $wpdb->terms.name LIKE '%$tag%' AND $wpdb->term_relationships.object_id = $wpdb->posts.ID ) )";
}
return $search;
}
add_filter( 'posts_search', 'and_extend_search', 500, 2 );