WordPress 4.1.1-scripts

[autoinstalls/wordpress.git] / wp-includes / compat.php

diff --git a/wp-includes/compat.php b/wp-includes/compat.php
index cb2a5597c8cde15867682100cfbf507a2016bc6d..ab4045250a6e434a62f19c4dc20d196a9efad1a9 100644 (file)
--- a/wp-includes/compat.php
+++ b/wp-includes/compat.php
@@ -94,3 +94,38 @@ if ( !function_exists('json_decode') ) {
                return is_array($data) ? array_map(__FUNCTION__, $data) : $data;
        }
 }
+
+if ( ! function_exists( 'hash_equals' ) ) :
+/**
+ * Compare two strings in constant time.
+ *
+ * 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;
+
+// JSON_PRETTY_PRINT was introduced in PHP 5.4
+// Defined here to prevent a notice when using it with wp_json_encode()
+if ( ! defined( 'JSON_PRETTY_PRINT' ) ) {
+       define( 'JSON_PRETTY_PRINT', 128 );
+}