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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 | 
|---|---|
| 1982 |                 * | 
| 1983 |                 * The dynamic portion of the hook name, `$field_no_prefix`, refers to | 
| 1984 |                 * the post field name. | 
| 1985 |                 * | 
| 1986 |                 * @since 2.3.0 | 
| 1987 |                 * | 
| 1988 |                 * @param mixed $value   Value of the post field. | 
| 1989 |                 * @param int   $post_id Post ID. | 
| 1990 |                 */ | 
| 1991 |                $value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id ); | 
| 1992 |           } else { | 
| 1993 |                $value = apply_filters( "edit_post_{$field}", $value, $post_id ); | 
| 1994 |           } | 
| 1995 |  | 
| 1996 |           if ( in_array($field, $format_to_edit) ) { | 
| 1997 |                if ( 'post_content' == $field ) | 
| 1998 |                     $value = format_to_edit($value, user_can_richedit()); | 
| 1999 |                else | 
| 2000 |                     $value = format_to_edit($value); |