/// <summary>
/// Checks whether a dereferenced variable is numeric.
/// </summary>
/// <param name="variable">The variable.</param>
/// <returns>Whether <paramref name="variable"/> is integer, double or numeric string.
/// <seealso cref="PHP.Core.Convert.StringToNumber"/></returns>
public static bool is_numeric(PhpValue variable)
{
switch (variable.TypeCode)
{
case PhpTypeCode.Int32:
case PhpTypeCode.Long:
case PhpTypeCode.Double:
return(true);
case PhpTypeCode.String:
case PhpTypeCode.MutableString:
PhpNumber tmp;
return((variable.ToNumber(out tmp) & Core.Convert.NumberInfo.IsNumber) != 0);
default:
return(false);
}
}