Forum und email


(PHP 4, PHP 5)

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


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.



The variable being evaluated.

Return Values

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