Error Reporting
   
    As of PHP 5 the error reporting
    constant E_STRICT is available, with the
    value 2048. When enabled, messages will be
    issued to warn you about code usage which is deprecated or which
    may not be future-proof.
   
   Note: 
    
     E_ALL does not include E_STRICT,
     so it's not enabled by default. You must explicitly set the error
     reporting level to include E_STRICT in order
     to see these messages.
    
   
   
    See Predefined Constants for more information.