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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 |
|---|---|
| 1460 | $value = apply_filters("pre_$field", $value); |
| 1461 | $value = apply_filters("${field_no_prefix}_save_pre", $value); |
| 1462 | } else { |
| 1463 | $value = apply_filters("pre_post_$field", $value); |
| 1464 | $value = apply_filters("${field}_pre", $value); |
| 1465 | } |
| 1466 | } else { |
| 1467 | // Use display filters by default. |
| 1468 | if ( $prefixed ) |
| 1469 | $value = apply_filters($field, $value, $post_id, $context); |
| 1470 | else |
| 1471 | $value = apply_filters("post_$field", $value, $post_id, $context); |
| 1472 | } |
| 1473 | |
| 1474 | if ( 'attribute' == $context ) |
| 1475 | $value = esc_attr($value); |
| 1476 | else if ( 'js' == $context ) |
| 1477 | $value = esc_js($value); |
| 1478 | |