JMS /串行無法安裝

Question

我使用的symfony 2.8，當我嘗試使用它作曲家顯示此錯誤安裝JMS /串行束，

composer require jms/serializer-bundle 

Problem 1 
- jms/serializer-bundle 1.0.0 requires jms/serializer ^1.0.0 -> satisfiable by jms/serializer[1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.4.2, 1.5.0, 1.6.0, 1.6.1, 1.6.2, 1.7.0, 1.7.1, 1.8.0, 1.8.1, 1.9.0]. 
- jms/serializer-bundle 1.5.0 requires php >=5.4.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer-bundle 1.4.0 requires php >=5.4.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer-bundle 1.3.1 requires php >=5.4.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer-bundle 1.3.0 requires php >=5.4.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer-bundle 1.2.1 requires php >=5.4.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer-bundle 1.2.0 requires php >=5.4.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer-bundle 1.1.0 requires php >=5.4.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer 1.9.0 requires php >=5.5.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 
- jms/serializer 1.8.1 requires php >=5.5.0 -> your PHP version (7.1.1) overridden by "config.platform.php" version (5.3.9) does not satisfy that requirement. 

我怎樣才能解決這個問題？

Answer 1

在我composer.json，刪除以下行：

"config": { 
    "platform": { 
     "php": "5.3.9" 
    } 
}, 

，現在它的工作。