diff --git a/.travis.yml b/.travis.yml
index 71b9734..674bf59 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ sudo: false
 language: php
 
 php:
-  - 7.0
   - 7.1
   - 7.2
   - 7.3
diff --git a/examples/client.php b/examples/client.php
index 4627563..9c93ac8 100644
--- a/examples/client.php
+++ b/examples/client.php
@@ -2,8 +2,8 @@
 
 require 'vendor/autoload.php';
 
-use Amp\Loop;
 use Amp\Ipc\Sync\ChannelledSocket;
+use Amp\Loop;
 
 use function Amp\asyncCall;
 use function Amp\Ipc\connect;
@@ -19,7 +19,7 @@ Loop::run(static function () {
         echo "Closed connection".PHP_EOL;
     };
 
-    $channel = yield connect(sys_get_temp_dir().'/test');
+    $channel = yield connect(\sys_get_temp_dir().'/test');
     asyncCall($clientHandler, $channel);
     yield $channel->send('ping');
-});
\ No newline at end of file
+});
diff --git a/examples/server.php b/examples/server.php
index 56f5638..b2fec73 100644
--- a/examples/server.php
+++ b/examples/server.php
@@ -3,8 +3,8 @@
 require 'vendor/autoload.php';
 
 use Amp\Ipc\IpcServer;
-use Amp\Loop;
 use Amp\Ipc\Sync\ChannelledSocket;
+use Amp\Loop;
 
 use function Amp\asyncCall;
 
@@ -22,8 +22,8 @@ Loop::run(static function () {
         echo "Closed connection".PHP_EOL."==========".PHP_EOL;
     };
 
-    $server = new IpcServer(sys_get_temp_dir().'/test');
+    $server = new IpcServer(\sys_get_temp_dir().'/test');
     while ($socket = yield $server->accept()) {
         asyncCall($clientHandler, $socket);
     }
-});
\ No newline at end of file
+});
diff --git a/lib/IpcServer.php b/lib/IpcServer.php
index c9bb439..f964623 100644
--- a/lib/IpcServer.php
+++ b/lib/IpcServer.php
@@ -3,8 +3,8 @@
 namespace Amp\Ipc;
 
 use Amp\Deferred;
-use Amp\Loop;
 use Amp\Ipc\Sync\ChannelledSocket;
+use Amp\Loop;
 use Amp\Promise;
 use Amp\Success;
 
diff --git a/lib/Sync/ChannelledSocket.php b/lib/Sync/ChannelledSocket.php
index 2926ef5..4aaff00 100644
--- a/lib/Sync/ChannelledSocket.php
+++ b/lib/Sync/ChannelledSocket.php
@@ -86,7 +86,7 @@ final class ChannelledSocket implements Channel
                 if ($data instanceof ChannelCloseReq) {
                     yield $channel->send(new ChannelCloseAck);
                     $this->state |= self::GOT_FIN_MASK;
-                } else if ($data instanceof ChannelCloseAck) {
+                } elseif ($data instanceof ChannelCloseAck) {
                     $this->state |= self::GOT_ACK_MASK;
                 }
             } while ($this->state !== self::GOT_ALL_MASK);
diff --git a/lib/functions.php b/lib/functions.php
index c6c1498..8b899ec 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -17,10 +17,10 @@ use function Amp\call;
 function connect(string $uri): Promise
 {
     return call(static function () use ($uri) {
-        if (!file_exists($uri)) {
+        if (!\file_exists($uri)) {
             throw new \RuntimeException("The endpoint does not exist!");
         }
-        
+
         $type = \filetype($uri);
         if ($type !== 'fifo') {
             if ($type === 'file') {
diff --git a/test/Fixtures/server.php b/test/Fixtures/server.php
index ff60bff..c99fa7d 100644
--- a/test/Fixtures/server.php
+++ b/test/Fixtures/server.php
@@ -22,7 +22,7 @@ return function (Channel $channel) use ($argv) {
     }
 
     $ping = yield $socket->receive();
-    
+
     if ($ping !== 'ping') {
         throw new \RuntimeException("Received $ping instead of ping!");
     }
diff --git a/test/IpcTest.php b/test/IpcTest.php
index 2e1e96d..3cc9c63 100644
--- a/test/IpcTest.php
+++ b/test/IpcTest.php
@@ -34,7 +34,7 @@ class IpcTest extends AsyncTestCase
 
     public function provideUriFifo(): \Generator
     {
-        foreach (['', sys_get_temp_dir().'/pony'] as $uri) {
+        foreach (['', \sys_get_temp_dir().'/pony'] as $uri) {
             if (\strncasecmp(\PHP_OS, "WIN", 3) === 0) {
                 yield [$uri, false];
             } else {