php扩展开发笔记（5）一些数组操作相关的宏和简单示例

实现类似isset($array[$value]) 功能，php代码如下

classSlash_Log {protectedstatic$levels = array(
        1 => "ERROR",
        2 => "WARNING",
        3 => "INFO",
        4 => "DEBUG",
    );

    publicfunctionsetLevel($level) {if (!isset(self::$levels)) {
            thrownewException("Level is not allowed");
        }
    }
}

C 代码如下

PHP_METHOD(slash_log, setLevel) {

    long level;
    zval *levels;
    zend_class_entry *ce;
    HashTable *levels_ht;

    ce = Z_OBJCE_P(getThis());
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &level) == FAILURE)
    {
        php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid argument");
        RETURN_FALSE;
    }

    levels = zend_read_static_property(ce, ZEND_STRL(SL_P_LEVELS), 0 TSRMLS_DC);
    levels_ht = Z_ARRVAL_P(levels);

    if (!zend_hash_index_exists(levels_ht, level)) {
        php_error_docref(NULL TSRMLS_CC, E_WARNING, "Level is not allowed");
        RETURN_FALSE;
    }

    zend_update_property_long(ce, getThis(), ZEND_STRL(SL_P_LEVEL), level TSRMLS_CC);
    RETURN_TRUE;
}

上面的例子中，主要是使用 zend_hash_index_exists 方法，关于操作 hash table 的有一系列的方法在 Zend/zend_hash.h

ZEND_API int zend_hash_add_empty_element(HashTable *ht, constchar *arKey, uint nKeyLength);
ZEND_API int zend_hash_del_key_or_index(HashTable *ht, constchar *arKey, uint nKeyLength, ulong h, int flag);
ZEND_API int zend_hash_find(const HashTable *ht, constchar *arKey, uint nKeyLength, void **pData);
ZEND_API int zend_hash_quick_find(const HashTable *ht, constchar *arKey, uint nKeyLength, ulong h, void **pData);
ZEND_API int zend_hash_index_find(const HashTable *ht, ulong h, void **pData);
ZEND_API int zend_hash_exists(const HashTable *ht, constchar *arKey, uint nKeyLength);
ZEND_API int zend_hash_quick_exists(const HashTable *ht, constchar *arKey, uint nKeyLength, ulong h);
ZEND_API int zend_hash_index_exists(const HashTable *ht, ulong h);
ZEND_API int zend_hash_move_forward_ex(HashTable *ht, HashPosition *pos);
ZEND_API int zend_hash_move_backwards_ex(HashTable *ht, HashPosition *pos);
ZEND_API int zend_hash_get_current_key_ex(const HashTable *ht, char **str_index, uint *str_length, ulong *num_index, zend_bool duplicate, HashPosition *pos);
ZEND_API int zend_hash_get_current_key_type_ex(HashTable *ht, HashPosition *pos);
ZEND_API int zend_hash_get_current_data_ex(HashTable *ht, void **pData, HashPosition *pos);
ZEND_API int zend_hash_update_current_key_ex(HashTable *ht, int key_type, constchar *str_index, uint str_length, ulong num_index, int mode, HashPosition *pos);
ZEND_API int zend_hash_get_pointer(const HashTable *ht, HashPointer *ptr);
ZEND_API int zend_hash_set_pointer(HashTable *ht, const HashPointer *ptr);
ZEND_API int zend_hash_sort(HashTable *ht, sort_func_t sort_func, compare_func_t compare_func, int renumber TSRMLS_DC);
ZEND_API int zend_hash_compare(HashTable *ht1, HashTable *ht2, compare_func_t compar, zend_bool ordered TSRMLS_DC);
ZEND_API int zend_hash_minmax(const HashTable *ht, compare_func_t compar, int flag, void **pData TSRMLS_DC);
ZEND_API int zend_hash_num_elements(const HashTable *ht);
ZEND_API int zend_hash_rehash(HashTable *ht);

以上就介绍了php扩展开发笔记（5）一些数组操作相关的宏和简单示例，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。