is_numeric

(PHP 4, PHP 5)

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.

Смотрите также

ctype_digit()
is_bool()
is_null()
is_float()
is_int()
is_string()
is_object()
is_array()