is_numeric --
Finds whether a variable is a number or a numeric string
Описание
bool is_numeric ( mixed var )
Finds whether the given variable is numeric. Numeric strings consist of
optional sign, any number of digits, optional decimal part and optional
exponential part. Thus +0123.45e6 is a valid numeric
value. Hexadecimal notation (0xFF) is allowed too but
only without sign, decimal and exponential part.
Список параметров
var
The variable being evaluated.
Возвращаемые значения
Returns TRUE if var is a number or a numeric
string, FALSE otherwise.