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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 |
|---|---|
| 377 | $value = ''; |
| 378 | break; |
| 379 | } |
| 380 | |
| 381 | if ( 'raw' == $context ) |
| 382 | return $value; |
| 383 | |
| 384 | if ( 'edit' == $context ) { |
| 385 | /** This filter is documented in wp-includes/post.php */ |
| 386 | $value = apply_filters( "edit_$field", $value, $bookmark_id ); |
| 387 | |
| 388 | if ( 'link_notes' == $field ) { |
| 389 | $value = esc_html( $value ); // textarea_escaped |
| 390 | } else { |
| 391 | $value = esc_attr($value); |
| 392 | } |
| 393 | } elseif ( 'db' == $context ) { |
| 394 | /** This filter is documented in wp-includes/post.php */ |
| 395 | $value = apply_filters( "pre_$field", $value ); |