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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 |
|---|---|
| 313 | if ( in_array($field, $format_to_edit) ) { |
| 314 | $value = format_to_edit($value); |
| 315 | } else { |
| 316 | $value = attribute_escape($value); |
| 317 | } |
| 318 | } else if ( 'db' == $context ) { |
| 319 | $value = apply_filters("pre_$field", $value); |
| 320 | } else { |
| 321 | // Use display filters by default. |
| 322 | $value = apply_filters($field, $value, $bookmark_id, $context); |
| 323 | } |
| 324 | |
| 325 | if ( 'attribute' == $context ) |
| 326 | $value = attribute_escape($value); |
| 327 | else if ( 'js' == $context ) |
| 328 | $value = js_escape($value); |
| 329 | |
| 330 | return $value; |
| 331 | } |