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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 |
|---|---|
| 844 | if ( 'post_content' == $field ) |
| 845 | $value = format_to_edit($value, user_can_richedit()); |
| 846 | else |
| 847 | $value = format_to_edit($value); |
| 848 | } else { |
| 849 | $value = attribute_escape($value); |
| 850 | } |
| 851 | } else if ( 'db' == $context ) { |
| 852 | if ( $prefixed ) { |
| 853 | $value = apply_filters("pre_$field", $value); |
| 854 | $value = apply_filters("${field_no_prefix}_save_pre", $value); |
| 855 | } else { |
| 856 | $value = apply_filters("pre_post_$field", $value); |
| 857 | $value = apply_filters("${field}_pre", $value); |
| 858 | } |
| 859 | } else { |
| 860 | // Use display filters by default. |
| 861 | if ( $prefixed ) |
| 862 | $value = apply_filters($field, $value, $post_id, $context); |