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<?php // No properties key. $schema = ['foo' => 'bar']; if (($schema['properties'] ?? NULL) === []) { $schema['properties'] = 'created'; } print_r($schema); if (($schema['properties'] ?? []) === []) { $schema['properties'] = 'created'; } print_r($schema); // Empty properties key. $schema = ['properties' => []]; if (($schema['properties'] ?? []) === []) { $schema['properties'] = 'created'; } print_r($schema);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [foo] => bar ) Array ( [foo] => bar [properties] => created ) Array ( [properties] => created )

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