Description:
------------
array key with a leading 0 and any digit except for 8 or 9 will not result in Parse error!

This have bin sens php 7.0+

Test script:
---------------
$a = array(00=>'OK',01=>'OK',02=>'OK',03=>'OK',04=>'OK',05=>'OK',06=>'OK',07=>'OK',10=>'OK',18=>'OK',19=>'OK');
#$b = array(08=>'08',09=>'09',018=>'018',019=>'019');
print_r($a);

Expected result:
----------------
Parse error: Invalid numeric literal in X on line Y

Actual result:
--------------
Array
(
    [0] => OK
    [1] => OK
    [2] => OK
    [3] => OK
    [4] => OK
    [5] => OK
    [6] => OK
    [7] => OK
    [10] => OK
    [18] => OK
    [19] => OK
)