Description:
------------
I've a large PHP array (~85000 elements) in a class, on php 5.5 (/usr/bin/php) on my system (mac OS X 10.11) it works as expected (count ~ 86459), but on same system with php 5.6 (php), it fails to lookup few keys because of wrong count (count ~ 20923).

testAds.php prints city name corresponding to ID 1027519, which exists in 2nd file AdwordsCityComponent.php. But doesn't work with different PHP versions.


Test script:
---------------
class AdwordsCityComponent {
  private $adwordsCityObj = 
          array(
1000010=>"Abu Dhabi,Abu Dhabi,United Arab Emirates",
1000011=>"Ajman,Ajman,United Arab Emirates",
// ~80000 more rows....
9062586=>"Bratislava Region,Slovakia",
9062587=>"Trnava Region,Slovakia");

    /**
     * getCityNameById
     */
    public function getCityNameById($adwordsCityObjId) {
        $cityName = "Unspecified";
        $cityArray = $this->adwordsCityObj;

        echo "Total array count : ";
        echo count($this->adwordsCityObj);
        if(array_key_exists($adwordsCityObjId, $cityArray)){
            $cityName = $cityArray[$adwordsCityObjId];
        }
        return $cityName;
    }
}

full source code & php -i output at: https://www.dropbox.com/s/83sd89t58xn7kz2/PhpArrayIssue.zip?dl=0


Expected result:
----------------
// PHP 5.5 works fine
administratorsmac$ /usr/bin/php testAds.php 
Total array count : 64455
Bremerton,Washington,United States


Actual result:
--------------
// PHP 5.6 gives wrong count & result
administratorsmac$ php testAds.php 
Total array count : 31687
Unspecified