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(PHP 7 >= 7.4.0, PHP 8)

FFI::castPerforms a C type cast


public FFI::cast(FFI\CType|string $type, FFI\CData|int|float|bool|null &$ptr): ?FFI\CData

FFI::cast() creates a new FFI\CData object, that references the same C data structure, but is associated with a different type. The resulting object does not own the C data, and the source ptr must survive the result. The C type may be specified as a string with any valid C type declaration or as FFI\CType object, created before. Any type declared for the instance is allowed.



A valid C declaration as string, or an instance of FFI\CType which has already been created.


The handle of the pointer to a C data structure.


Returns the freshly created FFI\CData object.


版本 说明
8.3.0 Calling FFI::cast() statically is now deprecated.

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User Contributed Notes 1 note

1 year ago
For example, stdlib.h headfile defines a function called "system()" in Linux: extern int system (const char *__command) __wur;
And we can call it using FFI extension:

= FFI::cdef('int system(char *command);')

Then execute the php script as if we were calling the real C `system()`:

$ whoami
> root
$ php demo.php
> root
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