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<?php $s = ['foo']['bar']; $baz = [ 'foo'=> [ 'bar' => 3 ] ]; echo $baz[$foo];
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "bar" in /in/svUt5 on line 3 Warning: Undefined variable $foo in /in/svUt5 on line 11 Warning: Undefined array key "" in /in/svUt5 on line 11

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