晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) Zend Technologies Ltd. (http://www.zend.com)           |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Author: Wez Furlong <wez@thebrainroom.com>                           |
   |         Marcus Boerger <helly@php.net>                               |
   +----------------------------------------------------------------------+
*/

/* These iterators were designed to operate within the foreach()
 * structures provided by the engine, but could be extended for use
 * with other iterative engine opcodes.
 * These methods have similar semantics to the zend_hash API functions
 * with similar names.
 * */

typedef struct _zend_object_iterator zend_object_iterator;

typedef struct _zend_object_iterator_funcs {
	/* release all resources associated with this iterator instance */
	void (*dtor)(zend_object_iterator *iter);

	/* check for end of iteration (FAILURE or SUCCESS if data is valid) */
	int (*valid)(zend_object_iterator *iter);

	/* fetch the item data for the current element */
	zval *(*get_current_data)(zend_object_iterator *iter);

	/* fetch the key for the current element (optional, may be NULL). The key
	 * should be written into the provided zval* using the ZVAL_* macros. If
	 * this handler is not provided auto-incrementing integer keys will be
	 * used. */
	void (*get_current_key)(zend_object_iterator *iter, zval *key);

	/* step forwards to next element */
	void (*move_forward)(zend_object_iterator *iter);

	/* rewind to start of data (optional, may be NULL) */
	void (*rewind)(zend_object_iterator *iter);

	/* invalidate current value/key (optional, may be NULL) */
	void (*invalidate_current)(zend_object_iterator *iter);

	/* Expose owned values to GC.
	 * This has the same semantics as the corresponding object handler. */
	HashTable *(*get_gc)(zend_object_iterator *iter, zval **table, int *n);
} zend_object_iterator_funcs;

struct _zend_object_iterator {
	zend_object std;
	zval data;
	const zend_object_iterator_funcs *funcs;
	zend_ulong index; /* private to fe_reset/fe_fetch opcodes */
};

typedef struct _zend_class_iterator_funcs {
	zend_function *zf_new_iterator;
	zend_function *zf_valid;
	zend_function *zf_current;
	zend_function *zf_key;
	zend_function *zf_next;
	zend_function *zf_rewind;
} zend_class_iterator_funcs;

BEGIN_EXTERN_C()
/* given a zval, returns stuff that can be used to iterate it. */
ZEND_API zend_object_iterator* zend_iterator_unwrap(zval *array_ptr);

/* given an iterator, wrap it up as a zval for use by the engine opcodes */
ZEND_API void zend_iterator_init(zend_object_iterator *iter);
ZEND_API void zend_iterator_dtor(zend_object_iterator *iter);

ZEND_API void zend_register_iterator_wrapper(void);
END_EXTERN_C()

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