class AcceptHeader 
 Represents an Accept-* header. An accept header is compound with a list of items, sorted by descending quality. 
Methods
   __construct(array $items) Constructor.  
 static AcceptHeader   fromString(string $headerValue) Builds an AcceptHeader instance from a string.  
 string   __toString() Returns header value's string representation.  
 bool   has(string $value) Tests if header has given value.  
 AcceptHeaderItem|null   get(string $value) Returns given value's item, if