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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 |
---|---|
1858 |
|
1859 | /** |
1860 | * Fires once the Customizer preview has initialized and JavaScript |
1861 | * settings have been printed. |
1862 | * |
1863 | * @since 3.4.0 |
1864 | * |
1865 | * @param WP_Customize_Manager $this WP_Customize_Manager instance. |
1866 | */ |
1867 | do_action( 'customize_preview_init', $this ); |
1868 | } |
1869 |
|
1870 | /** |
1871 | * Filter the X-Frame-Options and Content-Security-Policy headers to ensure frontend can load in customizer. |
1872 | * |
1873 | * @since 4.7.0 |
1874 | * |
1875 | * @param array $headers Headers. |
1876 | * @return array Headers. |