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<?php var_dump(count(array_keys('foo', array('foo', 'bar', 'foo'), true)));
based on OAYcr
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_keys() expects parameter 1 to be array, string given in /in/oJBnZ on line 3 int(0)
Output for hhvm-3.12.0
Warning: array_keys() expects parameter 1 to be an array or collection in /in/oJBnZ on line 3 int(0)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.17
Warning: array_keys(): The first argument should be an array in /in/oJBnZ on line 3 int(0)
Output for 4.3.0 - 4.4.9
Warning: Wrong parameter count for array_keys() in /in/oJBnZ on line 3 int(0)