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<?php $a = array( 'foo' => 'bar', 'example' => 'data', 'sn' => 'afu', ); $test = 'foo'; var_dump($a['example']); var_dump($test); var_dump($a[$test]);
Output for 4.3.0 - 5.6.23, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(4) "data" string(3) "foo" string(3) "bar"