Changed functions
 
  PHP Core
  
  
   - 
    
     getopt() has an optional third parameter that exposes
     the index of the next element in the argument vector list to be processed.
     This is done via a by-ref parameter.
    
   
 
   - 
    
     getenv() no longer requires its parameter. If the
     parameter is omitted, then the current environment variables will be
     returned as an associative array.
    
   
 
   - 
    
     get_headers() now has an additional parameter to enable
     for the passing of custom stream contexts.
    
   
 
   - 
    
     output_reset_rewrite_vars() no longer resets session
     URL rewrite variables.
    
   
 
   - 
    
     parse_url() is now more restrictive and supports
     RFC3986.
    
   
 
   - 
    
     unpack() now accepts an optional third parameter to
     specify the offset to begin unpacking from.
    
   
 
  
  
 
  File System
  
   - 
    
     file_get_contents() now accepts a negative seek offset
     if the stream is seekable.
    
   
 
   - 
    
     tempnam() now emits a notice when falling back to the
     system's temp directory.
    
   
 
  
  
 
 
 
  PDO
  
   - 
    
     PDO::lastInsertId() for PostgreSQL will now trigger an error
     when 
nextval has not been called for the current
     session (the postgres connection).