Online PHP editor | output for dntLu

@ 2017-01-21T12:09:24Z

<?php

class Leak {
  static protected function &leaked(array &$array = null) {
    $array = array('one');
    return $array;
  }

  public function toLeaked($array = null) {
    $array = static::leaked($array);
    return $array;
  }

  public function testLeak() {
    echo "memory before loop: " . memory_get_usage() . PHP_EOL;
    for ($i = 0; $i < 20000; $i++) {
      $leak = $this->toLeaked();
    }
    gc_collect_cycles();
    echo "memory after loop: " . memory_get_usage() . PHP_EOL;
  }
}

$leak = new Leak();
$leak->testLeak();

Output for 7.4.0: memory before loop: 389104 memory after loop: 389136
Output for 7.3.0 - 7.3.12: memory before loop: 389064 memory after loop: 389096
Output for 7.2.0 - 7.2.25: memory before loop: 385216 memory after loop: 385248
Output for 7.1.4 - 7.1.33: memory before loop: 348544 memory after loop: 348576
Output for 7.1.0 - 7.1.3: memory before loop: 348544 memory after loop: 828576
Output for 7.0.18 - 7.0.33: memory before loop: 348592 memory after loop: 349000
Output for 7.0.0 - 7.0.17: memory before loop: 348592 memory after loop: 8348624
Output for 5.6.0 - 5.6.40: memory before loop: 222824 memory after loop: 223288

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