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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 |
|---|---|
| 1919 | |
| 1920 | /** |
| 1921 | * Fires once the Customizer preview has initialized and JavaScript |
| 1922 | * settings have been printed. |
| 1923 | * |
| 1924 | * @since 3.4.0 |
| 1925 | * |
| 1926 | * @param WP_Customize_Manager $this WP_Customize_Manager instance. |
| 1927 | */ |
| 1928 | do_action( 'customize_preview_init', $this ); |
| 1929 | } |
| 1930 | |
| 1931 | /** |
| 1932 | * Filter the X-Frame-Options and Content-Security-Policy headers to ensure frontend can load in customizer. |
| 1933 | * |
| 1934 | * @since 4.7.0 |
| 1935 | * |
| 1936 | * @param array $headers Headers. |
| 1937 | * @return array Headers. |