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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 |
|---|---|
| 55 | * when this filter returns true. |
| 56 | * |
| 57 | * If the network is 50 sites or less, it will run every time. Otherwise, |
| 58 | * it will throttle itself to reduce load. |
| 59 | * |
| 60 | * @since 3.0.0 |
| 61 | * |
| 62 | * @param bool true Whether to perform the Multisite upgrade routine. Default true. |
| 63 | */ |
| 64 | } elseif ( apply_filters( 'do_mu_upgrade', true ) ) { |
| 65 | $c = get_blog_count(); |
| 66 | |
| 67 | /* |
| 68 | * If there are 50 or fewer sites, run every time. Otherwise, throttle to reduce load: |
| 69 | * attempt to do no more than threshold value, with some +/- allowed. |
| 70 | */ |
| 71 | if ( $c <= 50 || ( $c > 50 && mt_rand( 0, (int)( $c / 50 ) ) == 1 ) ) { |
| 72 | require_once( ABSPATH . WPINC . '/http.php' ); |
| 73 | $response = wp_remote_get( admin_url( 'upgrade.php?step=1' ), array( 'timeout' => 120, 'httpversion' => '1.1' ) ); |