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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 | 
|---|---|
| 827 |      if ( false !== strpos($field, 'post_') ) { | 
| 828 |           $prefixed = true; | 
| 829 |           $field_no_prefix = str_replace('post_', '', $field); | 
| 830 |      } | 
| 831 |  | 
| 832 |      if ( 'edit' == $context ) { | 
| 833 |           $format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password'); | 
| 834 |  | 
| 835 |           if ( $prefixed ) { | 
| 836 |                $value = apply_filters("edit_$field", $value, $post_id); | 
| 837 |                // Old school | 
| 838 |                $value = apply_filters("${field_no_prefix}_edit_pre", $value, $post_id); | 
| 839 |           } else { | 
| 840 |                $value = apply_filters("edit_post_$field", $value, $post_id); | 
| 841 |           } | 
| 842 |  | 
| 843 |           if ( in_array($field, $format_to_edit) ) { | 
| 844 |                if ( 'post_content' == $field ) | 
| 845 |                     $value = format_to_edit($value, user_can_richedit()); |