After some testing preg_match won as the fastest way to test this.

Miguel Manso · Miguel Manso · commit 456cfca20b5b · 2017-03-27T11:41:24.000+01:00
diff --git a/src/DependencyInjection/UecodeQPushExtension.php b/src/DependencyInjection/UecodeQPushExtension.php
@@ -42,10 +42,7 @@ class UecodeQPushExtension extends Extension
      * @param array            $configs
      * @param ContainerBuilder $container
      *
-     * @throws Exception
-     * @throws RuntimeException
-     * @throws InvalidArgumentException
-     * @throws ServiceNotFoundException
+     * @throws RuntimeException|InvalidArgumentException|ServiceNotFoundException
      */
     public function load(array $configs, ContainerBuilder $container)
     {
@@ -138,9 +135,8 @@ public function load(array $configs, ContainerBuilder $container)
                     ]
                 );
 
-                $reversedQueueName = strrev($values['options']['queue_name']);
-                $isQueueNameFIFOReady = strpos($reversedQueueName, 'ofif.') === 0;
-
+                // Check queue name ends with ".fifo"
+                $isQueueNameFIFOReady = preg_match("/$(?<=(\.fifo))/", $values['options']['queue_name']) === 1;
                 if ($values['options']['fifo'] === true && !$isQueueNameFIFOReady) {
                     throw new InvalidArgumentException('Queue name must end with ".fifo" on AWS FIFO queues');
                 }

Original file line number	Diff line number	Diff line change
`@@ -42,10 +42,7 @@ class UecodeQPushExtension extends Extension`
`42`	`42`	`* @param array $configs`
`43`	`43`	`* @param ContainerBuilder $container`
`44`	`44`	`*`
`45`		`- * @throws Exception`
`46`		`- * @throws RuntimeException`
`47`		`- * @throws InvalidArgumentException`
`48`		`- * @throws ServiceNotFoundException`
	`45`	`+ * @throws RuntimeException\|InvalidArgumentException\|ServiceNotFoundException`
`49`	`46`	`*/`
`50`	`47`	`public function load(array $configs, ContainerBuilder $container)`
`51`	`48`	`{`
`@@ -138,9 +135,8 @@ public function load(array $configs, ContainerBuilder $container)`
`138`	`135`	`]`
`139`	`136`	`);`
`140`	`137`
`141`		`- $reversedQueueName = strrev($values['options']['queue_name']);`
`142`		`- $isQueueNameFIFOReady = strpos($reversedQueueName, 'ofif.') === 0;`
`143`		`-`
	`138`	`+ // Check queue name ends with ".fifo"`
	`139`	`+ $isQueueNameFIFOReady = preg_match("/$(?<=(\.fifo))/", $values['options']['queue_name']) === 1;`
`144`	`140`	`if ($values['options']['fifo'] === true && !$isQueueNameFIFOReady) {`
`145`	`141`	`throw new InvalidArgumentException('Queue name must end with ".fifo" on AWS FIFO queues');`
`146`	`142`	`}`