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<?php namespace Test { trait Base { public $config = []; function __construct($config = []) { $this->config = $config; } } } namespace { class Config { use Test\Base; } $test = new Config(['foo' => 'bar']); echo isset($test->config['foo']) ? 'Success: foo is set' : 'Error: foo is not set'; }
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Success: foo is set

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