is_numeric()

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

Syntax

bool is_numeric (mixed $var)

Arguments

• var - The variable being evaluated.

Description

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 +0123.45e6is a valid numeric value. Hexadecimal notation ( 0xFF) is allowed too but only without sign, decimal and exponential part.

Version

PHP 4, 5

Return value

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