_wp_is_valid_utf8_fallback() │ WP 6.9.0

Fallback mechanism for safely validating UTF-8 bytes.

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

bool. Whether the provided bytes can decode as valid UTF-8.

Usage

_wp_is_valid_utf8_fallback( $bytes ): bool;
$bytes(string) (required)
String which might contain text encoded as UTF-8.

Notes

See: wp_is_valid_utf8()

Changelog

Since 6.9.0 Introduced.

_wp_is_valid_utf8_fallback() code WP 7.1

wp-includes/compat-utf8.php 
function _wp_is_valid_utf8_fallback( string $bytes ): bool {
	$bytes_length = strlen( $bytes );
	if ( 0 === $bytes_length ) {
		return true;
	}

	$next_byte_at   = 0;
	$invalid_length = 0;

	_wp_scan_utf8( $bytes, $next_byte_at, $invalid_length );

	return $bytes_length === $next_byte_at && 0 === $invalid_length;
}