add_blog_option( int $id, string $option, mixed $value ): bool

Adds a new option for a given blog ID.


You do not need to serialize values. If the value needs to be serialized, then it will be serialized before it is inserted into the database. Remember, resources can not be serialized or added as an option.

You can create options without values and then update the values later.
Existing options will not be updated and checks are performed to ensure that you aren’t adding a protected WordPress option. Care should be taken to not name options the same as the ones which are protected.

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$id int Required
A blog ID. Can be null to refer to the current blog.
$option string Required
Name of option to add. Expected to not be SQL-escaped.
$value mixed Required
Option value, can be anything. Expected to not be SQL-escaped.

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bool True if the option was added, false otherwise.

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File: wp-includes/ms-blogs.php. View all references

function add_blog_option( $id, $option, $value ) {
	$id = (int) $id;

	if ( empty( $id ) ) {
		$id = get_current_blog_id();

	if ( get_current_blog_id() == $id ) {
		return add_option( $option, $value );

	switch_to_blog( $id );
	$return = add_option( $option, $value );

	return $return;

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Version Description
MU (3.0.0) Introduced.

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