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.
    
   
 
 
  JSON
  
   - 
    
     json_encode() now accepts a new option,
     JSON_UNESCAPED_LINE_TERMINATORS, to disable the
     escaping of U+2028 and U+2029 characters whenJSON_UNESCAPED_UNICODEis supplied.
 
 
 
  PDO
  
   - 
    
     PDO::lastInsertId() for PostgreSQL will now trigger an error
     when nextval has not been called for the current
     session (the postgres connection).
    
   
 
 
  PostgreSQL
  
   - 
    
     pg_last_notice() now accepts an optional parameter to
     specify an operation. This can be done with one of the following new
     constants: PGSQL_NOTICE_LAST,PGSQL_NOTICE_ALL, orPGSQL_NOTICE_CLEAR.
- 
    
     pg_fetch_all() now accepts an optional second parameter
     to specify the result type (similar to the third parameter of
     pg_fetch_array()).
    
   
- 
    
     pg_select() now accepts an optional fourth parameter to
     specify the result type (similar to the third parameter of
     pg_fetch_array()).