/// <summary>
/// Gets constant value, throws <c>notice</c> if constant is not defined.
/// </summary>
public static PhpValue ReadConstant(Context ctx, string name, ref int idx, string fallbackName)
{
Debug.Assert(name != null, nameof(name));
Debug.Assert(fallbackName != null, nameof(fallbackName));
PhpValue value;
if (ctx.TryGetConstant(name, out value, ref idx) == false &&
ctx.TryGetConstant(fallbackName, out value) == false)
{
// Warning: undefined constant
PhpException.Throw(PhpError.Notice, Resources.ErrResources.undefined_constant, fallbackName);
value = (PhpValue)fallbackName;
}
return(value);
}