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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 |
|---|---|
| 1718 | $value = apply_filters("pre_{$field}", $value); |
| 1719 | $value = apply_filters("{$field_no_prefix}_save_pre", $value); |
| 1720 | } else { |
| 1721 | $value = apply_filters("pre_post_{$field}", $value); |
| 1722 | $value = apply_filters("{$field}_pre", $value); |
| 1723 | } |
| 1724 | } else { |
| 1725 | // Use display filters by default. |
| 1726 | if ( $prefixed ) |
| 1727 | $value = apply_filters($field, $value, $post_id, $context); |
| 1728 | else |
| 1729 | $value = apply_filters("post_{$field}", $value, $post_id, $context); |
| 1730 | } |
| 1731 | |
| 1732 | if ( 'attribute' == $context ) |
| 1733 | $value = esc_attr($value); |
| 1734 | else if ( 'js' == $context ) |
| 1735 | $value = esc_js($value); |
| 1736 | |