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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 61 | * @param bool true Whether to perform the Multisite upgrade routine. Default true. |
| 62 | */ |
| 63 | } elseif ( apply_filters( 'do_mu_upgrade', true ) ) { |
| 64 | $c = get_blog_count(); |
| 65 | // If 50 or fewer sites, run every time. Else, run "about ten percent" of the time. Shh, don't check that math. |
| 66 | if ( $c <= 50 || ( $c > 50 && mt_rand( 0, (int)( $c / 50 ) ) == 1 ) ) { |
| 67 | require_once( ABSPATH . WPINC . '/http.php' ); |
| 68 | $response = wp_remote_get( admin_url( 'upgrade.php?step=1' ), array( 'timeout' => 120, 'httpversion' => '1.1' ) ); |
| 69 | /** This action is documented in wp-admin/network/upgrade.php */ |
| 70 | do_action( 'after_mu_upgrade', $response ); |
| 71 | unset($response); |
| 72 | } |
| 73 | unset($c); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | require_once(ABSPATH . 'wp-admin/includes/admin.php'); |
| 78 | |
| 79 | auth_redirect(); |