July 5, 2011 
Definition:
function is_multi_author() {}
Does this site have more than one author
Checks to see if more than one author has published posts.
Return values
returns:Whether or not we have more than one author
Defined filters
- is_multi_author
apply_filters( 'is_multi_author', (bool)
Source code
function is_multi_author() {
global $wpdb;
if ( false === ( $is_multi_author = wp_cache_get('is_multi_author', 'posts') ) ) {
$rows = (array) $wpdb->get_col("SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 2");
$is_multi_author = 1 < count( $rows ) ? 1 : 0;
wp_cache_set('is_multi_author', $is_multi_author, 'posts');
}
return apply_filters( 'is_multi_author', (bool) $is_multi_author );
}
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