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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 |
---|---|
1622 | } |
1623 |
|
1624 | if ( 'description' == $field ) |
1625 | $value = esc_html( $value ); // textarea_escaped? |
1626 | else |
1627 | $value = esc_attr($value); |
1628 | } elseif ( 'db' == $context ) { |
1629 | if ( $prefixed ) { |
1630 | /** This filter is documented in wp-includes/post.php */ |
1631 | $value = apply_filters( "pre_{$field}", $value ); |
1632 | } else { |
1633 |
|
1634 | /** |
1635 | * Filter the value of a user field in the 'db' context. |
1636 | * |
1637 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
1638 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
1639 | * |
1640 | * @since 2.9.0 |