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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 |
|---|---|
| 1304 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1305 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1306 | * |
| 1307 | * @since 2.9.0 |
| 1308 | * |
| 1309 | * @param mixed $value The user object value to sanitize. |
| 1310 | * @param int $user_id User ID. |
| 1311 | * @param string $context The context to filter within. |
| 1312 | */ |
| 1313 | $value = apply_filters( "user_{$field}", $value, $user_id, $context ); |
| 1314 | } |
| 1315 | } |
| 1316 | |
| 1317 | if ( 'user_url' == $field ) { |
| 1318 | $value = esc_url( $value ); |
| 1319 | } |
| 1320 | |
| 1321 | if ( 'attribute' == $context ) { |
| 1322 | $value = esc_attr( $value ); |