diff --git a/PHP/src/snowflake/spinlock.c b/PHP/src/snowflake/spinlock.c
index 977a409..eb7b86a 100644
--- a/PHP/src/snowflake/spinlock.c
+++ b/PHP/src/snowflake/spinlock.c
@@ -10,7 +10,7 @@
 extern int ncpu;
 extern int spin;
 
-void spin_lock(atomic_t* lock, uint32_t pid)
+void spin_lock(atomic_t *lock, uint32_t pid)
 {
 	int i, n;
 
@@ -22,8 +22,8 @@ void spin_lock(atomic_t* lock, uint32_t pid)
 			InterlockedCompareExchange(lock, pid, 0) == 0
 #else
 			__sync_bool_compare_and_swap(lock, 0, pid)
-#endif 
-			)
+#endif
+		)
 		{
 			return;
 		}
@@ -36,11 +36,7 @@ void spin_lock(atomic_t* lock, uint32_t pid)
 
 				for (i = 0; i < n; i++)
 				{
-#ifdef WIN32
-					MemoryBarrier();
-#else 
-					__asm("pause");
-#endif 
+					atomic_cpu_pause();
 				}
 
 				if (*lock == 0 &&
@@ -48,8 +44,8 @@ void spin_lock(atomic_t* lock, uint32_t pid)
 					InterlockedCompareExchange(lock, pid, 0) == 0
 #else
 					__sync_bool_compare_and_swap(lock, 0, pid)
-#endif 
-					)
+#endif
+				)
 				{
 					return;
 				}
@@ -63,11 +59,11 @@ void spin_lock(atomic_t* lock, uint32_t pid)
 	}
 }
 
-void spin_unlock(atomic_t* lock, uint32_t pid)
+void spin_unlock(atomic_t *lock, uint32_t pid)
 {
 #ifdef WIN32
 	InterlockedCompareExchange(lock, 0, pid);
 #else
 	__sync_bool_compare_and_swap(lock, pid, 0);
-#endif 
+#endif
 }
diff --git a/PHP/src/snowflake/spinlock.h b/PHP/src/snowflake/spinlock.h
index c1535f1..c334407 100644
--- a/PHP/src/snowflake/spinlock.h
+++ b/PHP/src/snowflake/spinlock.h
@@ -8,4 +8,14 @@ extern void spin_lock(atomic_t *lock, uint32_t pid);
 
 extern void spin_unlock(atomic_t *lock, uint32_t pid);
 
+#if defined(WIN32)
+#define atomic_cpu_pause() MemoryBarrier();
+#elif defined(__x86_64__)
+#define atomic_cpu_pause() __asm__ __volatile__("pause")
+#elif defined(__aarch64__)
+#define atomic_cpu_pause() __asm__ __volatile__("yield")
+#else
+#define atomic_cpu_pause()
+#endif
+
 #endif
diff --git a/PHP/tests/003.phpt b/PHP/tests/003.phpt
index b3d4647..5a0564b 100644
--- a/PHP/tests/003.phpt
+++ b/PHP/tests/003.phpt
@@ -1,16 +1,15 @@
 --TEST--
-Check for snowdrift serial
+Check for snowdrift batch get unique
 --SKIPIF--
 <?php if (!extension_loaded("snowdrift")) print "skip"; ?>
 --FILE--
 <?php
 $arr = [];
-$max = 1024;
-for ($i = 0; $i < $max; $i++) {
-	$arr[$i] = SnowDrift::NextId();
+$max = 100000;
+foreach (SnowDrift::NextNumId($max) as $id) {
+	$arr[$id] = '';
 }
-
-var_dump(($arr[$max-1] - $arr[0]) == ($max-1));
+var_dump(count($arr));
 ?>
 --EXPECT--
-bool(true)
\ No newline at end of file
+int(100000)
\ No newline at end of file
diff --git a/PHP/tests/004.phpt b/PHP/tests/004.phpt
deleted file mode 100644
index 5a0564b..0000000
--- a/PHP/tests/004.phpt
+++ /dev/null
@@ -1,15 +0,0 @@
---TEST--
-Check for snowdrift batch get unique
---SKIPIF--
-<?php if (!extension_loaded("snowdrift")) print "skip"; ?>
---FILE--
-<?php
-$arr = [];
-$max = 100000;
-foreach (SnowDrift::NextNumId($max) as $id) {
-	$arr[$id] = '';
-}
-var_dump(count($arr));
-?>
---EXPECT--
-int(100000)
\ No newline at end of file