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<?php $foo = []; define('SOME_CONSTANT', 'bar'); $foo⦋SOME_CONSTANT⦌ = 123; var_dump($foo[SOME_CONSTANT]);
based on F1eBK

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for Arrow functions
Notice: Undefined index: bar in /in/KZqC3 on line 5 NULL

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