WordPress at a glance
filter is not described

post_password_required filter-hook . WP 4.7.0

Filters whether a post requires the user to supply a password.

Usage

add_filter( 'post_password_required', 'filter_function_name_9091', 10, 2 );
function filter_function_name_9091( $required, $post ){
	// filter...

	return $required;
}
$required(true/false)
Whether the user needs to supply a password. True if password has not been provided or is incorrect, false if password has been supplied or is not required.
$post(WP_Post)
Post data.

Where the hook is called

post_password_required()
wp-includes/post-template.php 823
return apply_filters( 'post_password_required', $required, $post );
wp-includes/post-template.php 796
return apply_filters( 'post_password_required', false, $post );
wp-includes/post-template.php 801
return apply_filters( 'post_password_required', true, $post );

Where the hook is used (in WP core)

wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php 1577
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php 1589
remove_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 295
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 311
remove_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 409
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 1511
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 1538
remove_filter( 'post_password_required', '__return_false' );