Php/docs/class.ffi-cdata
来自菜鸟教程
(PHP 7 >= 7.4.0)
简介
FFI\CData objects can be used in a number of ways as a regular PHP data:
- C data of scalar types can be read and assigned via the $cdata property, e.g.
$x = FFI::new('int'); $x->cdata = 42; - C struct and union fields can be accessed as regular PHP object property, e.g.
$cdata->field - C array elements can be accessed as regular PHP array elements, e.g.
$cdata[$offset] - C arrays can be iterated using foreach statements.
- C arrays can be used as arguments of count().
- C pointers can be dereferenced as arrays, e.g.
$cdata[0] - C pointers can be compared using regular comparison operators (
<,<=,==,!=,>=,>). - C pointers can be incremented and decremented using regular
+/-/++/–-operations, e.g.$cdata += 5 - C pointers can be subtracted from another using regular
-operations. - C pointers to functions can be called as a regular PHP closure, e.g.
$cdata() - Any C data can be duplicated using the clone operator, e.g.
$cdata2 = clone $cdata; - Any C data can be visualized using var_dump(), print_r(), etc.
Note:
Notable limitations are that FFI\CData instances do not support isset(), empty() and unset(), and that wrapped C structs and unions do not implement Traversable.
类摘要
FFI\CData {
}
