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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 |
|---|---|
| 855 | } else { |
| 856 | $value = apply_filters("pre_post_$field", $value); |
| 857 | $value = apply_filters("${field}_pre", $value); |
| 858 | } |
| 859 | } else { |
| 860 | // Use display filters by default. |
| 861 | if ( $prefixed ) |
| 862 | $value = apply_filters($field, $value, $post_id, $context); |
| 863 | else |
| 864 | $value = apply_filters("post_$field", $value, $post_id, $context); |
| 865 | } |
| 866 | |
| 867 | if ( 'attribute' == $context ) |
| 868 | $value = attribute_escape($value); |
| 869 | else if ( 'js' == $context ) |
| 870 | $value = js_escape($value); |
| 871 | |
| 872 | return $value; |
| 873 | } |