is_numeric

(PHP 4, PHP 5)

is_numeric --  Finds whether a variable is a number or a numeric string

Beskrivelse

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.

Parameterliste

var

The variable being evaluated.

Returneringsværdier

Returns TRUE if var is a number or a numeric string, FALSE otherwise.

Se også

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