设置内部数组指针,不用PHP迭代

$array = range(1,100);

// Represents the array key
$pointer = 66;

set_array_pointer($pointer,$array);

$nextValue = next($array); // Should return 68

使用 ArrayIterator::seek提供的LibertyPaul解决方案似乎是使PHP设置指针到数组中的位置的唯一方法,而不会初始化用户界面中的循环.
尽管如此,您可以从ArrayIterator :: seek()的PHP source中读取,PHP将内部循环通过数组来设置指针：

/* {{{ proto void ArrayIterator::seek(int $position)
   Seek to position. */
SPL_METHOD(Array,seek)
{
    zend_long opos,position;
    zval *object = getThis();
    spl_array_object *intern = Z_SPLARRAY_P(object);
    HashTable *aht = spl_array_get_hash_table(intern);
    int result;

    if (zend_parse_parameters(ZEND_NUM_ARGS(),"l",&position) == FAILURE) {
        return;
    }

    if (!aht) {
        PHP_error_docref(NULL,E_NOTICE,"Array was modified outside object and is no longer an array");
        return;
    }

    opos = position;

    if (position >= 0) { /* negative values are not supported */
        spl_array_rewind(intern);
        result = SUCCESS;

        while (position-- > 0 && (result = spl_array_next(intern)) == SUCCESS);

        if (result == SUCCESS && zend_hash_has_more_elements_ex(aht,spl_array_get_pos_ptr(aht,intern)) == SUCCESS) {
            return; /* ok */
        }
    }
    zend_throw_exception_ex(spl_ce_OutOfBoundsException,"Seek position %pd is out of range",opos);
} /* }}} */

所以看起来没有办法将数组指针设置到某个位置,而不会循环遍历数组