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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 |
|---|---|
| 1334 | * |
| 1335 | * The dynamic portion of the hook name, $field, refers to the prefixed user |
| 1336 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1337 | * |
| 1338 | * @since 2.9.0 |
| 1339 | * |
| 1340 | * @param mixed $value Value of the prefixed user field. |
| 1341 | * @param int $user_id User ID. |
| 1342 | */ |
| 1343 | $value = apply_filters( "edit_user_{$field}", $value, $user_id ); |
| 1344 | } |
| 1345 | |
| 1346 | if ( 'description' == $field ) |
| 1347 | $value = esc_html( $value ); // textarea_escaped? |
| 1348 | else |
| 1349 | $value = esc_attr($value); |
| 1350 | } else if ( 'db' == $context ) { |
| 1351 | if ( $prefixed ) { |
| 1352 | /** This filter is documented in wp-includes/post.php */ |