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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 |
|---|---|
| 1937 | |
| 1938 | /** |
| 1939 | * Fires once the Customizer preview has initialized and JavaScript |
| 1940 | * settings have been printed. |
| 1941 | * |
| 1942 | * @since 3.4.0 |
| 1943 | * |
| 1944 | * @param WP_Customize_Manager $manager WP_Customize_Manager instance. |
| 1945 | */ |
| 1946 | do_action( 'customize_preview_init', $this ); |
| 1947 | } |
| 1948 | |
| 1949 | /** |
| 1950 | * Filters the X-Frame-Options and Content-Security-Policy headers to ensure frontend can load in customizer. |
| 1951 | * |
| 1952 | * @since 4.7.0 |
| 1953 | * |
| 1954 | * @param array $headers Headers. |
| 1955 | * @return array Headers. |