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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 |
---|---|
1661 | } |
1662 |
|
1663 | if ( 'description' == $field ) |
1664 | $value = esc_html( $value ); // textarea_escaped? |
1665 | else |
1666 | $value = esc_attr($value); |
1667 | } elseif ( 'db' == $context ) { |
1668 | if ( $prefixed ) { |
1669 | /** This filter is documented in wp-includes/post.php */ |
1670 | $value = apply_filters( "pre_{$field}", $value ); |
1671 | } else { |
1672 |
|
1673 | /** |
1674 | * Filter the value of a user field in the 'db' context. |
1675 | * |
1676 | * The dynamic portion of the hook name, `$field`, refers to the prefixed user |
1677 | * field being filtered, such as 'user_login', 'user_email', 'first_name', etc. |
1678 | * |
1679 | * @since 2.9.0 |