wp_set_internal_encoding() │ WP 3.0.0

Sets internal encoding.

In most cases the default internal encoding is latin1, which is of no use, since we want to use the mb_ functions for utf-8 strings.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

No Hooks.

Returns

null. Nothing (null).

Usage

wp_set_internal_encoding();

Changelog

Since 3.0.0 Introduced.

wp_set_internal_encoding() code WP 6.9.1

wp-includes/load.php 
function wp_set_internal_encoding() {
	if ( function_exists( 'mb_internal_encoding' ) ) {
		$charset = get_option( 'blog_charset' );
		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
		if ( ! $charset || ! @mb_internal_encoding( $charset ) ) {
			mb_internal_encoding( 'UTF-8' );
		}
	}
}