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run code in 150+ php & hhvm versions
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<?php $data = array( 'hello' => 'world', ); var_dump( $data[hello] );
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant hello - assumed 'hello' in /in/Siak9 on line 7 string(5) "world"
Output for hhvm-3.10.0
Notice: Use of undefined constant hello - assumed 'hello' in /in/Siak9 on line -1 string(5) "world"