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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 |
|---|---|
| 346 | if ( 'edit' == $context ) { |
| 347 | $value = apply_filters("edit_$field", $value, $bookmark_id); |
| 348 | |
| 349 | if ( 'link_notes' == $field ) { |
| 350 | $value = esc_html( $value ); // textarea_escaped |
| 351 | } else { |
| 352 | $value = esc_attr($value); |
| 353 | } |
| 354 | } else if ( 'db' == $context ) { |
| 355 | $value = apply_filters("pre_$field", $value); |
| 356 | } else { |
| 357 | // Use display filters by default. |
| 358 | $value = apply_filters($field, $value, $bookmark_id, $context); |
| 359 | |
| 360 | if ( 'attribute' == $context ) |
| 361 | $value = esc_attr($value); |
| 362 | else if ( 'js' == $context ) |
| 363 | $value = esc_js($value); |
| 364 | } |