Compare performance of class_implements vs implementsInterface (using ReflectionClass) for 1,00,000 class.

perf.php

<?php
// Define an interface
interface MyInterface {
  public function myFunction();
}

// Define 1000 classes that implement the interface
for ($i = 1; $i <= 100000; $i++) {
  $className = 'MyClass' . $i;
  eval("
    class $className implements MyInterface {
      public function myFunction() {
        // Do something
      }
    }
  ");
}

// Define a function to check if a class implements the interface using class_implements()
function check_implements($class) {
  if (class_exists($class)) {
    return in_array('MyInterface', class_implements($class));
  } else {
    return false;
  }
}

// Define a function to check if a class implements the interface using ReflectionClass
function check_reflection($class) {
  if (class_exists($class)) {
    $reflection = new ReflectionClass($class);
    return $reflection->implementsInterface('MyInterface');
  } else {
    return false;
  }
}

// Generate an array of class names to test
$classes = array();
for ($i = 1; $i <= 100000; $i++) {
  $classes[] = 'MyClass' . $i;
}

// Test the performance of the check_implements() function
$start = microtime(true);
foreach ($classes as $class) {
  check_implements($class);
}
$end = microtime(true);
$duration_implements = ($end - $start) * 1000;
echo "check_implements() duration: $duration_implements ms\n";

// Test the performance of the check_reflection() function
$start = microtime(true);
foreach ($classes as $class) {
  check_reflection($class);
}
$end = microtime(true);
$duration_reflection = ($end - $start) * 1000;
echo "check_reflection() duration: $duration_reflection ms\n";

result.txt

# On M1 machine - base model.
check_implements() duration: 43.645858764648 ms
check_reflection() duration: 56.891918182373 ms