WordPress at a glance
filter is not described

check_password filter-hook . WP 2.5.0

Filters whether the plaintext password matches the encrypted password.


add_filter( 'check_password', 'filter_function_name_7022', 10, 4 );
function filter_function_name_7022( $check, $password, $hash, $user_id ){
	// filter...

	return $check;
Whether the passwords match.
The plaintext password.
The hashed password.
User ID. Can be empty.

Where the hook is called

wp-includes/pluggable.php 2259
return apply_filters( 'check_password', $check, $password, $hash, $user_id );
wp-includes/pluggable.php 2273
return apply_filters( 'check_password', $check, $password, $hash, $user_id );

Where the hook is used (in WP core)

Does not used.