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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 |
|---|---|
| 413 | $value = apply_filters( "edit_{$field}", $value, $bookmark_id ); |
| 414 | |
| 415 | if ( 'link_notes' == $field ) { |
| 416 | $value = esc_html( $value ); // textarea_escaped |
| 417 | } else { |
| 418 | $value = esc_attr( $value ); |
| 419 | } |
| 420 | } elseif ( 'db' == $context ) { |
| 421 | /** This filter is documented in wp-includes/post.php */ |
| 422 | $value = apply_filters( "pre_{$field}", $value ); |
| 423 | } else { |
| 424 | /** This filter is documented in wp-includes/post.php */ |
| 425 | $value = apply_filters( "{$field}", $value, $bookmark_id, $context ); |
| 426 | |
| 427 | if ( 'attribute' == $context ) { |
| 428 | $value = esc_attr( $value ); |
| 429 | } elseif ( 'js' == $context ) { |
| 430 | $value = esc_js( $value ); |
| 431 | } |