PHP7常量const修饰符syntax error, unexpected 'const' (T_CONST), expecting variable (T_VARIABLE)
错误代码语法解析错误:syntaxerror,unexpected'const'(T_CONST),expectingvariable(T_VARIABLE)代码classPsr16CacheimplementsCacheInterface,PruneableInterface,ResettableInterface{useProxyTrait;privateconstMETADATA_EXPIR