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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 |
|---|---|
| 1979 | if ( false !== strpos($field, 'post_') ) { |
| 1980 | $prefixed = true; |
| 1981 | $field_no_prefix = str_replace('post_', '', $field); |
| 1982 | } |
| 1983 | |
| 1984 | if ( 'edit' == $context ) { |
| 1985 | $format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password'); |
| 1986 | |
| 1987 | if ( $prefixed ) { |
| 1988 | $value = apply_filters("edit_{$field}", $value, $post_id); |
| 1989 | // Old school |
| 1990 | $value = apply_filters("{$field_no_prefix}_edit_pre", $value, $post_id); |
| 1991 | } else { |
| 1992 | $value = apply_filters("edit_post_{$field}", $value, $post_id); |
| 1993 | } |
| 1994 | |
| 1995 | if ( in_array($field, $format_to_edit) ) { |
| 1996 | if ( 'post_content' == $field ) |
| 1997 | $value = format_to_edit($value, user_can_richedit()); |