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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 |
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64 | * when this filter returns true. |
65 | * |
66 | * If the network is 50 sites or less, it will run every time. Otherwise, |
67 | * it will throttle itself to reduce load. |
68 | * |
69 | * @since MU (3.0.0) |
70 | * |
71 | * @param bool $do_mu_upgrade Whether to perform the Multisite upgrade routine. Default true. |
72 | */ |
73 | if ( apply_filters( 'do_mu_upgrade', true ) ) { |
74 | $c = get_blog_count(); |
75 |
|
76 | /* |
77 | * If there are 50 or fewer sites, run every time. Otherwise, throttle to reduce load: |
78 | * attempt to do no more than threshold value, with some +/- allowed. |
79 | */ |
80 | if ( $c <= 50 || ( $c > 50 && mt_rand( 0, (int) ( $c / 50 ) ) === 1 ) ) { |
81 | require_once ABSPATH . WPINC . '/http.php'; |
82 | $response = wp_remote_get( |