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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 |
---|---|
5213 | ); |
5214 |
|
5215 | /** |
5216 | * Filters the message to explain required form fields. |
5217 | * |
5218 | * @since 6.1.0 |
5219 | * |
5220 | * @param string $message Message text and glyph wrapped in a `span` tag. |
5221 | */ |
5222 | return apply_filters( 'wp_required_field_message', $message ); |
5223 | } |
5224 |
|
5225 | /** |
5226 | * Default settings for heartbeat. |
5227 | * |
5228 | * Outputs the nonce used in the heartbeat XHR. |
5229 | * |
5230 | * @since 3.6.0 |
5231 | * |