is_null
is_object
Variable handling Functions
PHP Manual

# 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()

is_null
is_object
Variable handling Functions
PHP Manual