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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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702 | /** |
703 | * Fires for each custom update action on the WordPress Updates screen. |
704 | * |
705 | * The dynamic portion of the hook name, `$action`, refers to the |
706 | * passed update action. The hook fires in lieu of all available |
707 | * default update actions. |
708 | * |
709 | * @since 3.2.0 |
710 | */ |
711 | do_action( "update-core-custom_{$action}" ); |
712 | } |
713 |
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