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C Data Handles
(PHP 7 >= 7.4.0)
Introduction
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.
$cdata[0]
-
C pointers can be compared using regualar comparison operators (
<
,<=
,==
,!=
,>=
,>
). -
C pointers can be incremented and decremented using regular
+
/-
/++
/–-
operations, e.g.$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: Noteable limitations are that FFI\CData instances do not support isset(), empty() and unset(), and that wrapped C structs and unions do not implement Traversable.
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-class.ffi-cdata.html
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References
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