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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 |
|---|---|
| 883 | $value = format_to_edit($value, user_can_richedit()); |
| 884 | else |
| 885 | $value = format_to_edit($value); |
| 886 | } else { |
| 887 | $value = esc_attr($value); |
| 888 | } |
| 889 | } else if ( 'db' == $context ) { |
| 890 | if ( $prefixed ) { |
| 891 | $value = apply_filters("pre_$field", $value); |
| 892 | $value = apply_filters("${field_no_prefix}_save_pre", $value); |
| 893 | } else { |
| 894 | $value = apply_filters("pre_post_$field", $value); |
| 895 | $value = apply_filters("${field}_pre", $value); |
| 896 | } |
| 897 | } else { |
| 898 | // Use display filters by default. |
| 899 | if ( $prefixed ) |
| 900 | $value = apply_filters($field, $value, $post_id, $context); |
| 901 | else |