<?php var_export( key_exists( 'foo', $obj?->does[123]?->not?->exist[678] ?? [] ) ? 'yep' : 'nope' ); echo "\n---\n"; var_export( property_exists( $obj?->does[123]?->not?->exist[678] ?? (object) [], 'foo' ) ? 'yep' : 'nope' );
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