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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 |
|---|---|
| 2005 | $value = apply_filters("pre_{$field}", $value); |
| 2006 | $value = apply_filters("{$field_no_prefix}_save_pre", $value); |
| 2007 | } else { |
| 2008 | $value = apply_filters("pre_post_{$field}", $value); |
| 2009 | $value = apply_filters("{$field}_pre", $value); |
| 2010 | } |
| 2011 | } else { |
| 2012 | // Use display filters by default. |
| 2013 | if ( $prefixed ) |
| 2014 | $value = apply_filters($field, $value, $post_id, $context); |
| 2015 | else |
| 2016 | $value = apply_filters("post_{$field}", $value, $post_id, $context); |
| 2017 | } |
| 2018 | |
| 2019 | if ( 'attribute' == $context ) |
| 2020 | $value = esc_attr($value); |
| 2021 | else if ( 'js' == $context ) |
| 2022 | $value = esc_js($value); |
| 2023 | |