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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 |
|---|---|
| 1684 | if ( false !== strpos($field, 'post_') ) { |
| 1685 | $prefixed = true; |
| 1686 | $field_no_prefix = str_replace('post_', '', $field); |
| 1687 | } |
| 1688 | |
| 1689 | if ( 'edit' == $context ) { |
| 1690 | $format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password'); |
| 1691 | |
| 1692 | if ( $prefixed ) { |
| 1693 | $value = apply_filters("edit_{$field}", $value, $post_id); |
| 1694 | // Old school |
| 1695 | $value = apply_filters("{$field_no_prefix}_edit_pre", $value, $post_id); |
| 1696 | } else { |
| 1697 | $value = apply_filters("edit_post_{$field}", $value, $post_id); |
| 1698 | } |
| 1699 | |
| 1700 | if ( in_array($field, $format_to_edit) ) { |
| 1701 | if ( 'post_content' == $field ) |
| 1702 | $value = format_to_edit($value, user_can_richedit()); |