diff --git a/src/wp-includes/compat.php b/src/wp-includes/compat.php
index 38d51900c4..69f01fadfd 100644
--- a/src/wp-includes/compat.php
+++ b/src/wp-includes/compat.php
@@ -449,59 +449,6 @@ if ( ! function_exists( 'sodium_crypto_box' ) ) {
 	require ABSPATH . WPINC . '/sodium_compat/autoload.php';
 }
 
-if ( ! function_exists( 'array_replace_recursive' ) ) :
-	/**
-	 * PHP-agnostic version of {@link array_replace_recursive()}.
-	 *
-	 * The array_replace_recursive() function is a PHP 5.3 function. WordPress
-	 * currently supports down to PHP 5.2, so this method is a workaround
-	 * for PHP 5.2.
-	 *
-	 * Note: array_replace_recursive() supports infinite arguments, but for our use-
-	 * case, we only need to support two arguments.
-	 *
-	 * Subject to removal once WordPress makes PHP 5.3.0 the minimum requirement.
-	 *
-	 * @since 4.5.3
-	 *
-	 * @see https://secure.php.net/manual/en/function.array-replace-recursive.php#109390
-	 *
-	 * @param  array $base         Array with keys needing to be replaced.
-	 * @param  array $replacements Array with the replaced keys.
-	 *
-	 * @return array
-	 */
-	function array_replace_recursive( $base = array(), $replacements = array() ) {
-		foreach ( array_slice( func_get_args(), 1 ) as $replacements ) {
-			$bref_stack = array( &$base );
-			$head_stack = array( $replacements );
-
-			do {
-				end( $bref_stack );
-
-				$bref = &$bref_stack[ key( $bref_stack ) ];
-				$head = array_pop( $head_stack );
-
-				unset( $bref_stack[ key( $bref_stack ) ] );
-
-				foreach ( array_keys( $head ) as $key ) {
-					if ( isset( $key, $bref ) &&
-						isset( $bref[ $key ] ) && is_array( $bref[ $key ] ) &&
-						isset( $head[ $key ] ) && is_array( $head[ $key ] ) ) {
-
-						$bref_stack[] = &$bref[ $key ];
-						$head_stack[] = $head[ $key ];
-					} else {
-						$bref[ $key ] = $head[ $key ];
-					}
-				}
-			} while ( count( $head_stack ) );
-		}
-
-		return $base;
-	}
-endif;
-
 /**
  * Polyfill for the SPL autoloader. In PHP 5.2 (but not 5.3 and later), SPL can
  * be disabled, and PHP 7.2 raises notices if the compiler finds an __autoload()