From 6f24b0546723d8764d0c4753fbcbe8f567b72588 Mon Sep 17 00:00:00 2001
From: apetitpa <arnaudpetitpas@protonmail.ch>
Date: Fri, 24 Mar 2017 17:16:55 +0100
Subject: [PATCH] Switch to `empty` native function to check emptiness

Switch to `empty` because depending on the PHP version, substr returns '' or false
---
 .../Component/Validator/Constraints/EmailValidator.php        | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Symfony/Component/Validator/Constraints/EmailValidator.php b/src/Symfony/Component/Validator/Constraints/EmailValidator.php
index ce42219e26..1a771debf9 100644
--- a/src/Symfony/Component/Validator/Constraints/EmailValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/EmailValidator.php
@@ -138,7 +138,7 @@ class EmailValidator extends ConstraintValidator
      */
     private function checkMX($host)
     {
-        return '' !== $host && checkdnsrr($host, 'MX');
+        return !empty($host) && checkdnsrr($host, 'MX');
     }
 
     /**
@@ -150,6 +150,6 @@ class EmailValidator extends ConstraintValidator
      */
     private function checkHost($host)
     {
-        return '' !== $host && ($this->checkMX($host) || (checkdnsrr($host, 'A') || checkdnsrr($host, 'AAAA')));
+        return !empty($host) && ($this->checkMX($host) || (checkdnsrr($host, 'A') || checkdnsrr($host, 'AAAA')));
     }
 }