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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 |
|---|---|
| 474 | if ( 'post_content' == $field ) |
| 475 | $value = format_to_edit($value, user_can_richedit()); |
| 476 | else |
| 477 | $value = format_to_edit($value); |
| 478 | } else { |
| 479 | $value = attribute_escape($value); |
| 480 | } |
| 481 | } else if ( 'db' == $context ) { |
| 482 | if ( $prefixed ) { |
| 483 | $value = apply_filters("pre_$field", $value); |
| 484 | $value = apply_filters("${field_no_prefix}_save_pre", $value); |
| 485 | } else { |
| 486 | $value = apply_filters("pre_post_$field", $value); |
| 487 | $value = apply_filters("${field}_pre", $value); |
| 488 | } |
| 489 | } else { |
| 490 | // Use display filters by default. |
| 491 | if ( $prefixed ) |
| 492 | $value = apply_filters($field, $value, $post_id, $context); |