-if ( ! function_exists( 'hash_equals' ) ) :
-/**
- * Compare two strings in constant time.
- *
- * This function is NOT pluggable. It is in this file (in addition to
- * compat.php) to prevent errors if, during an update, pluggable.php
- * copies over but compat.php does not.
- *
- * This function was added in PHP 5.6.
- * It can leak the length of a string.
- *
- * @since 3.9.2
- *
- * @param string $a Expected string.
- * @param string $b Actual string.
- * @return bool Whether strings are equal.
- */
-function hash_equals( $a, $b ) {
- $a_length = strlen( $a );
- if ( $a_length !== strlen( $b ) ) {
- return false;
- }
- $result = 0;
-
- // Do not attempt to "optimize" this.
- for ( $i = 0; $i < $a_length; $i++ ) {
- $result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
- }
-
- return $result === 0;
-}
-endif;