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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 |
|---|---|
| 340 | if ( in_array($field, $format_to_edit) ) { |
| 341 | $value = format_to_edit($value); |
| 342 | } else { |
| 343 | $value = esc_attr($value); |
| 344 | } |
| 345 | } else if ( 'db' == $context ) { |
| 346 | $value = apply_filters("pre_$field", $value); |
| 347 | } else { |
| 348 | // Use display filters by default. |
| 349 | $value = apply_filters($field, $value, $bookmark_id, $context); |
| 350 | |
| 351 | if ( 'attribute' == $context ) |
| 352 | $value = esc_attr($value); |
| 353 | else if ( 'js' == $context ) |
| 354 | $value = esc_js($value); |
| 355 | } |
| 356 | |
| 357 | return $value; |
| 358 | } |