View difference between Paste ID: 2xftNXip and VRbDHsEv

 <?php
 
 /**
  * Performance test for 'Checking if an instance's class implements an interface?'
  * See: http://stackoverflow.com/q/274360/473961
  *
  * Results for 100,000 iterations:
- * class_implements + in_array: 149.19 ms
+ * class_implements + isset: 149.19 ms
  * Reflection: 294.79 ms
  * InstanceOf (with cheap __construct()): 84.65 ms
  */
 
 interface IInterface
 {
 }
 
 class TheClass implements IInterface
 {
 }
 
 $tmp = false;
 $interfaces = null;
 $class = null;
 
 $start = microtime(true);
 for ($i = 0; $i < 100000; $i++) {
     $interfaces = class_implements('TheClass');
 
     $tmp = isset($interfaces['IInterface']);
 }
 $end = microtime(true);
 
 $total = round(($end - $start) * 1000.0, 2);
-echo "class_implements + in_array: " . $total . " ms\n";
+echo "class_implements + isset: " . $total . " ms\n";
 
 $start = microtime(true);
 for ($i = 0; $i < 100000; $i++) {
     $class = new ReflectionClass('TheClass');
     $tmp = $class->implementsInterface('IInterface');
 }
 $end = microtime(true);
 
 $total = round(($end - $start) * 1000.0, 2);
 echo "Reflection: " . $total . " ms\n";
 
 $start = microtime(true);
 for ($i = 0; $i < 100000; $i++) {
     $class = new TheClass();
     $tmp = ($class instanceof IInterface);
 }
 $end = microtime(true);
 
 $total = round(($end - $start) * 1000.0, 2);
 echo "InstanceOf: " . $total . " ms\n";