count_many_users_posts( array $users, string|array $post_type = 'post', bool $public_only = false )

Number of posts written by a list of users.

Parameters

$users

(array) (Required) Array of user IDs.

$post_type

(string|array) (Optional) Single post type or array of post types to check. Defaults to 'post'.

Default value: 'post'

$public_only

(bool) (Optional) Only return counts for public posts. Defaults to false.

Default value: false

Return

(array) Amount of posts each user has written.

Source

File: wp-includes/user.php 

function count_many_users_posts( $users, $post_type = 'post', $public_only = false ) {
	global $wpdb;

	$count = array();
	if ( empty( $users ) || ! is_array( $users ) )
		return $count;

	$userlist = implode( ',', array_map( 'absint', $users ) );
	$where = get_posts_by_author_sql( $post_type, true, null, $public_only );

	$result = $wpdb->get_results( "SELECT post_author, COUNT(*) FROM $wpdb->posts $where AND post_author IN ($userlist) GROUP BY post_author", ARRAY_N );
	foreach ( $result as $row ) {
		$count[ $row[0] ] = $row[1];
	}

	foreach ( $users as $id ) {
		if ( ! isset( $count[ $id ] ) )
			$count[ $id ] = 0;
	}

	return $count;
}

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Related

Uses

Uses
Uses Description
wp-includes/wp-db.php: wpdb::get_results()

Retrieve an entire SQL result set from the database (i.e., many rows)
wp-includes/post.php: get_posts_by_author_sql()

Retrieve the post SQL based on capability, author, and type.

Changelog

Changelog
Version Description
WP-3.0.0 Introduced.