Function is_numeric_string_ex 

pub unsafe extern "C" fn is_numeric_string_ex(
    str_: *const c_char,
    length: usize,
    lval: *mut zend_long,
    dval: *mut f64,
    allow_errors: bool,
    oflow_info: *mut c_int,
    trailing_data: *mut bool,
) -> u8