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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 |
|---|---|
| 1918 | |
| 1919 | if ( 'description' === $field ) { |
| 1920 | $value = esc_html( $value ); // textarea_escaped? |
| 1921 | } else { |
| 1922 | $value = esc_attr( $value ); |
| 1923 | } |
| 1924 | } elseif ( 'db' === $context ) { |
| 1925 | if ( $prefixed ) { |
| 1926 | /** This filter is documented in wp-includes/post.php */ |
| 1927 | $value = apply_filters( "pre_{$field}", $value ); |
| 1928 | } else { |
| 1929 | |
| 1930 | /** |
| 1931 | * Filters the value of a user field in the 'db' context. |
| 1932 | * |
| 1933 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
| 1934 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
| 1935 | * |
| 1936 | * @since 2.9.0 |