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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 |
|---|---|
| 790 | } else { |
| 791 | $value = apply_filters("pre_post_$field", $value); |
| 792 | $value = apply_filters("${field}_pre", $value); |
| 793 | } |
| 794 | } else { |
| 795 | // Use display filters by default. |
| 796 | if ( $prefixed ) |
| 797 | $value = apply_filters($field, $value, $post_id, $context); |
| 798 | else |
| 799 | $value = apply_filters("post_$field", $value, $post_id, $context); |
| 800 | } |
| 801 | |
| 802 | if ( 'attribute' == $context ) |
| 803 | $value = attribute_escape($value); |
| 804 | else if ( 'js' == $context ) |
| 805 | $value = js_escape($value); |
| 806 | |
| 807 | return $value; |
| 808 | } |