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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 |
|---|---|
| 816 | $value = format_to_edit($value, user_can_richedit()); |
| 817 | else |
| 818 | $value = format_to_edit($value); |
| 819 | } else { |
| 820 | $value = attribute_escape($value); |
| 821 | } |
| 822 | } else if ( 'db' == $context ) { |
| 823 | if ( $prefixed ) { |
| 824 | $value = apply_filters("pre_$field", $value); |
| 825 | $value = apply_filters("${field_no_prefix}_save_pre", $value); |
| 826 | } else { |
| 827 | $value = apply_filters("pre_post_$field", $value); |
| 828 | $value = apply_filters("${field}_pre", $value); |
| 829 | } |
| 830 | } else { |
| 831 | // Use display filters by default. |
| 832 | if ( $prefixed ) |
| 833 | $value = apply_filters($field, $value, $post_id, $context); |
| 834 | else |