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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 |
|---|---|
| 5200 | ); |
| 5201 | |
| 5202 | /** |
| 5203 | * Filters the message to explain required form fields. |
| 5204 | * |
| 5205 | * @since 6.1.0 |
| 5206 | * |
| 5207 | * @param string $message Message text and glyph wrapped in a `span` tag. |
| 5208 | */ |
| 5209 | return apply_filters( 'wp_required_field_message', $message ); |
| 5210 | } |
| 5211 | |
| 5212 | /** |
| 5213 | * Default settings for heartbeat. |
| 5214 | * |
| 5215 | * Outputs the nonce used in the heartbeat XHR. |
| 5216 | * |
| 5217 | * @since 3.6.0 |
| 5218 | * |