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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 |
|---|---|
| 2014 | * |
| 2015 | * @param mixed $value Value of the prefixed post field. |
| 2016 | * @param int $post_id Post ID. |
| 2017 | * @param string $context Context for how to sanitize the field. Possible |
| 2018 | * values include 'raw', 'edit', 'db', 'display', |
| 2019 | * 'attribute' and 'js'. |
| 2020 | */ |
| 2021 | $value = apply_filters( $field, $value, $post_id, $context ); |
| 2022 | } else { |
| 2023 | $value = apply_filters( "post_{$field}", $value, $post_id, $context ); |
| 2024 | } |
| 2025 | } |
| 2026 | |
| 2027 | if ( 'attribute' == $context ) |
| 2028 | $value = esc_attr($value); |
| 2029 | elseif ( 'js' == $context ) |
| 2030 | $value = esc_js($value); |
| 2031 | |
| 2032 | return $value; |