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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 |
|---|---|
| 1274 | |
| 1275 | if ( 'description' == $field ) { |
| 1276 | $value = esc_html( $value ); // textarea_escaped? |
| 1277 | } else { |
| 1278 | $value = esc_attr( $value ); |
| 1279 | } |
| 1280 | } elseif ( 'db' == $context ) { |
| 1281 | if ( $prefixed ) { |
| 1282 | /** This filter is documented in wp-includes/post.php */ |
| 1283 | $value = apply_filters( "pre_{$field}", $value ); |
| 1284 | } else { |
| 1285 | |
| 1286 | /** |
| 1287 | * Filters the value of a user field in the 'db' context. |
| 1288 | * |
| 1289 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1290 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1291 | * |
| 1292 | * @since 2.9.0 |