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is_numeric
PHP Manual
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is_numeric

(PHP 4, PHP 5)

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

Description

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.

Parameters

var

The variable being evaluated.

Return Values

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

See Also

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

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