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WordPress

apply_filters( 'pre_get_main_site_id', int|null $main_site_id, WP_Network $network )

Since
4.9.0
Filters the main site ID.

Description

Returning a positive integer will effectively short-circuit the function.

Compatibility

WordPress
since 4.9.0
  • 6.7.7
  • 6.8.8
  • 6.9.7
  • 7.0.4
  • 7.1.0

Present in every tracked release (6.7.7 to 7.1.0).

Parameters

$main_site_idint|null
If a positive integer is returned, it is interpreted as the main site ID.
$networkWP_Network
The network object for which the main site was detected.

Where this hook fires · 1

  • wp-includes/class-wp-network.php:234WP_Network::get_main_site_id()

Source code

		 *		 * @since 4.9.0		 *		 * @param int|null   $main_site_id If a positive integer is returned, it is interpreted as the main site ID.		 * @param WP_Network $network      The network object for which the main site was detected.		 */		$main_site_id = (int) apply_filters( 'pre_get_main_site_id', null, $this ); 		if ( 0 < $main_site_id ) {			return $main_site_id;		} 		if ( 0 < (int) $this->blog_id ) {

Changelog

Introduced in 4.9.0. Unchanged from 6.7.7 through 7.1.0.

  1. 6.7.7
  2. 6.8.8
  3. 6.9.7
  4. 7.0.4
  5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

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