PHP マニュアル: PHP Callbacks

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.

ヒント

It is therefore recommended to minimize the usage of PHP callbacks.