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      Finds whether a variable is a number or a numeric string
      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

      Variable handling Functions
      PHP Manual

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