is_numeric Finds whether a variable is a number or a numeric string &reftitle.description; boolis_numeric mixedvar 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. &reftitle.parameters; var The variable being evaluated. &reftitle.returnvalues; Returns &true; if var is a number or a numeric string, &false; otherwise. &reftitle.examples; ]]> &reftitle.seealso; ctype_digit is_bool is_null is_float is_int is_string is_object is_array