A Complete PHP/FFI/preloading Example
php.ini
ffi.enable=preload opcache.preload=preload.php
preload.php
<?php
FFI::load(__DIR__ . "/dummy.h");
opcache_compile_file(__DIR__ . "/dummy.php");
?>
dummy.h
#define FFI_SCOPE "DUMMY" #define FFI_LIB "libc.so.6" int printf(const char *format, ...);
dummy.php
<?php
final class Dummy {
private static $ffi = null;
function __construct() {
if (is_null(self::$ffi)) {
self::$ffi = FFI::scope("DUMMY");
}
}
function printf($format, ...$args) {
return (int)self::$ffi->printf($format, ...$args);
}
}
?>
test.php
<?php
$d = new Dummy();
$d->printf("Hello %s!\n", "world");
?>