(PHP 7 >= 7.4.0, PHP 8)
FFI::string — Creates a PHP string from a memory area
   Creates a PHP string from size bytes of the memory area
   pointed to by ptr.
  
ptrThe start of the memory area from which to create a string.
size
      The number of bytes to copy to the string.
      If size is omitted, ptr must be a zero terminated
      array of C chars.
     
The freshly created PHP string.
| 版本 | 说明 | 
|---|---|
| 8.0.0 | sizeis nullable now; previously, its default was0. |