C Data Handles
(PHP 7 >= 7.4.0, PHP 8)
Einführung
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.
Hinweis: 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.
Klassenbeschreibung
final
class FFI\CData
{
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