## 完整 PHP/FFI/preloading 示例

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");
    ?>

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