Title: 4.7.1 | Developer.WordPress.org

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# New and updated in 4.7.1

Functions

Hooks

Classes

Methods

 * method[WP_Customize_Manager::_sanitize_external_header_video()](https://developer.wordpress.org/reference/classes/wp_customize_manager/_sanitize_external_header_video/)
 * Callback for sanitizing the external_header_video value.
 * Used by [0 functions](https://developer.wordpress.org/reference/classes/wp_customize_manager/_sanitize_external_header_video/#used-by)
   | Uses [1 function](https://developer.wordpress.org/reference/classes/wp_customize_manager/_sanitize_external_header_video/#uses)
   | Source: [wp-includes/class-wp-customize-manager.php:6141](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/class-wp-customize-manager.php#L6141-L6143)
 * function[wp_get_image_mime()](https://developer.wordpress.org/reference/functions/wp_get_image_mime/)
 * Returns the real mime type of an image file.
 * Used by [5 functions](https://developer.wordpress.org/reference/functions/wp_get_image_mime/#used-by)
   | Uses [1 function](https://developer.wordpress.org/reference/functions/wp_get_image_mime/#uses)
   | Source: [wp-includes/functions.php:3344](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/functions.php#L3344-L3434)