rabbitmq error when connect

i got this error when i try to connect using php-amqp: Fatal error: Class 'AMQPConnecti开发者_开发问答on' not found in

$credentials =array('host' => 'localhost','port' => 5672);
$cnn = new AMQPConnection($credentials);
$cnn->connect();

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It looks like you don't have the AMQP PECL extension installed. That PECL extension is not a default part of PHP, so you'll need to compile and install it using the pecl tool.