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<?php class LazyPool { private $connections = []; private $providers = []; public function addProvider($name, callable $provider) { $this->providers[$name] = $provider; return $this; } public function getConnection($name) { if ( array_key_exists($name, $this->connections) === false || $this->connections[$name] === null ) { $this->connections[$name] = call_user_func( $this->providers[$name] ); } return $this->connections[$name]; } }
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