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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 |
|---|---|
| 2009 | |
| 2010 | /** |
| 2011 | * Filters the custom CSS output into the head element. |
| 2012 | * |
| 2013 | * @since 4.7.0 |
| 2014 | * |
| 2015 | * @param string $css CSS pulled in from the Custom CSS post type. |
| 2016 | * @param string $stylesheet The theme stylesheet name. |
| 2017 | */ |
| 2018 | $css = apply_filters( 'wp_get_custom_css', $css, $stylesheet ); |
| 2019 | |
| 2020 | return $css; |
| 2021 | } |
| 2022 | |
| 2023 | /** |
| 2024 | * Updates the `custom_css` post for a given theme. |
| 2025 | * |
| 2026 | * Inserts a `custom_css` post when one doesn't yet exist. |
| 2027 | * |