WP_Theme::get_allowed_on_site( int $blog_id = null ): string[]

Source

public static function get_allowed_on_site( $blog_id = null ) {	static $allowed_themes = array();	if ( ! $blog_id || ! is_multisite() ) {	$blog_id = get_current_blog_id();	}	if ( isset( $allowed_themes[ $blog_id ] ) ) {	/** * Filters the array of themes allowed on the site. * * @since 4.5.0 * * @param string[] $allowed_themes An array of theme stylesheet names. * @param int $blog_id ID of the site. Defaults to current site. */	return (array) apply_filters( 'site_allowed_themes', $allowed_themes[ $blog_id ], $blog_id );	}	$current = get_current_blog_id() === $blog_id;	if ( $current ) {	$allowed_themes[ $blog_id ] = get_option( 'allowedthemes' );	} else {	switch_to_blog( $blog_id );	$allowed_themes[ $blog_id ] = get_option( 'allowedthemes' );	restore_current_blog();	}	/* * This is all super old MU back compat joy. * 'allowedthemes' keys things by stylesheet. 'allowed_themes' keyed things by name. */	if ( false === $allowed_themes[ $blog_id ] ) {	if ( $current ) {	$allowed_themes[ $blog_id ] = get_option( 'allowed_themes' );	} else {	switch_to_blog( $blog_id );	$allowed_themes[ $blog_id ] = get_option( 'allowed_themes' );	restore_current_blog();	}	if ( ! is_array( $allowed_themes[ $blog_id ] ) || empty( $allowed_themes[ $blog_id ] ) ) {	$allowed_themes[ $blog_id ] = array();	} else {	$converted = array();	$themes = wp_get_themes();	foreach ( $themes as $stylesheet => $theme_data ) {	if ( isset( $allowed_themes[ $blog_id ][ $theme_data->get( 'Name' ) ] ) ) {	$converted[ $stylesheet ] = true;	}	}	$allowed_themes[ $blog_id ] = $converted;	}	// Set the option so we never have to go through this pain again.	if ( is_admin() && $allowed_themes[ $blog_id ] ) {	if ( $current ) {	update_option( 'allowedthemes', $allowed_themes[ $blog_id ], false );	delete_option( 'allowed_themes' );	} else {	switch_to_blog( $blog_id );	update_option( 'allowedthemes', $allowed_themes[ $blog_id ], false );	delete_option( 'allowed_themes' );	restore_current_blog();	}	}	}	/** This filter is documented in wp-includes/class-wp-theme.php */	return (array) apply_filters( 'site_allowed_themes', $allowed_themes[ $blog_id ], $blog_id ); } 

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