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@ 2016-01-17T21:32:11Z

<?php

namespace A;

class B
{
    const X = [
        'Y' => [
            'Z' => 'value'
        ]
    ];
}

var_dump(defined('\A\B::X') && isset(\A\B::X['Y']['Z']));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
defined: documentation ( source)

preferences:dark modelive preview

41.5 ms | 402 KiB | 5 Q