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<?php $value = array( 'a', 'b' ); var_dump( range(0, count($value) -1) ); var_dump( array_keys($value) !== range(0, count($value) -1) );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> int(0) [1]=> int(1) } bool(false)