PHPのお勉強！

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PHP 8.4.2 Released!

    PHP Callbacks

    It is possible to assign a PHP closure to a native variable of function pointer type or to pass it as a function argument:

    例1 Assigning a PHP Closure to a C function pointer

    <?php
    $zend     = FFI::cdef("
    typedef int (*zend_write_func_t)(const char *str, size_t str_length);
    extern zend_write_func_t zend_write;
    "    );

    echo     "Hello World 1!\n";

    $orig_zend_write = clone $zend->zend_write;
    $zend->zend_write = function($str, $len) {
    global     $orig_zend_write;
    $orig_zend_write("{\n\t", 3);
    $ret = $orig_zend_write($str, $len);
    $orig_zend_write("}\n", 2);
    return     $ret;
    };
    echo     "Hello World 2!\n";
    $zend->zend_write = $orig_zend_write;
    echo     "Hello World 3!\n";
    ?>

    上の例の出力は以下となります。

    Hello World 1!
{
        Hello World 2!
}
Hello World 3!
    Although this works, this functionality is not supported on all libffi platforms, is not efficient and leaks resources by the end of request.
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    It is therefore recommended to minimize the usage of PHP callbacks.

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