php的扩展与嵌入--php扩展中的数组和哈希表2_PHP教程

typedef int (*apply_func_t)(void *pDest TSRMLS_DC);
void zend_hash_apply(HashTable *ht,
        apply_func_t apply_func TSRMLS_DC);

typedef int (*apply_func_arg_t)(void *pDest,
                            void *argument TSRMLS_DC);
void <strong>zend_hash_apply_with_argument</strong>(HashTable *ht,
        apply_func_arg_t apply_func, void *data TSRMLS_DC);

<?php foreach($arr as $val) {     echo "The value is: $val\n"; }
?>

int php_sample_print_zval(zval **val TSRMLS_DC)
{
    //重新copy一个zval，防止破坏原数据
    zval tmpcopy = **val;
    zval_copy_ctor(&tmpcopy);
     
    //转换为字符串
    INIT_PZVAL(&tmpcopy);
    convert_to_string(&tmpcopy);
    
    //开始输出
    php_printf("The value is: ");
    PHPWRITE(Z_STRVAL(tmpcopy), Z_STRLEN(tmpcopy));
    php_printf("\n");
     
    //毁尸灭迹
    zval_dtor(&tmpcopy);
     
    //返回，继续遍历下一个～
    return ZEND_HASH_APPLY_KEEP;
}

<?php
foreach($arr as $key => $val) {     echo "The value of $key is: $val\n"; }
?>

int php_sample_print_zval_and_key(zval **val,         int num_args, va_list args, zend_hash_key *hash_key) {
    /* 复制zval从而使得原来的内容被保存下来 */     
    zval tmpcopy = **val;     
    /* tsrm_ls is needed by output functions */     
    TSRMLS_FETCH();     
    zval_copy_ctor(&tmpcopy);     
    /* Reset refcount & Convert */
    INIT_PZVAL(&tmpcopy);
    convert_to_string(&tmpcopy);     
    /* 输出 */
    php_printf("The value of ");
    if (hash_key->nKeyLength) {  
        /* 如果是字符串类型的key */    
        PHPWRITE(hash_key->arKey, hash_key->nKeyLength);     
    } else {
        /* 如果是数字类型的key */ 
        php_printf("%ld", hash_key->h);     
    }
    php_printf(" is: ");
    PHPWRITE(Z_STRVAL(tmpcopy), Z_STRLEN(tmpcopy));     php_printf("\n");
    /* Toss out old copy */
    zval_dtor(&tmpcopy);
    /* continue; */
    return ZEND_HASH_APPLY_KEEP;
}

<?php
    $arr = array('a'=>1, 'b'=>2, 'c'=>3);
    reset($arr);
    while (list($key, $val) = each($arr)) {
        /* Do something with $key and $val */
    }
    reset($arr);
    $firstkey = key($arr);
    $firstval = current($arr);
    $bval = next($arr);
    $cval = next($arr);
?>

	* /* reset() */
void zend_hash_internal_pointer_reset(HashTable *ht);
        /* key() */
int zend_hash_get_current_key(HashTable *ht,
        char **strIdx, unit *strIdxLen,
        ulong *numIdx, zend_bool duplicate);
	* /* current() */
int zend_hash_get_current_data(HashTable *ht, void **pData);
	* /* next()/each() */
int zend_hash_move_forward(HashTable *ht);
	* /* prev() */
int zend_hash_move_backwards(HashTable *ht);
	* /* end() */
void zend_hash_internal_pointer_end(HashTable *ht);
	* /* Other... */
int zend_hash_get_current_key_type(HashTable *ht);
int zend_hash_has_more_elements(HashTable *ht);

void php_sample_print_var_hash(HashTable *arrht)
{
    for(zend_hash_internal_pointer_reset(arrht);
    zend_hash_has_more_elements(arrht) == SUCCESS;
    zend_hash_move_forward(arrht)) {
        char *key;
        uint keylen;
        ulong idx;
        int type;
        zval **ppzval, tmpcopy;
        type = zend_hash_get_current_key_ex(arrht, &key, &keylen,
                                                  &idx, 0, NULL);//获得返回的key的类型。这个类型可能有三种
        if (zend_hash_get_current_data(arrht, (void**)&ppzval) == FAILURE) {//获得当前索引所指的数据值
            /* Should never actually fail
             * since the key is known to exist. */
            continue;
        }
        /* 复制zval的值，从而原来的值不会被破坏掉 */
        tmpcopy = **ppzval;
        zval_copy_ctor(&tmpcopy);
        /* 重新设定refcount 并且转换 */
        INIT_PZVAL(&tmpcopy);
        convert_to_string(&tmpcopy);
        /* 输出 */
        php_printf("The value of ");
        if (type == HASH_KEY_IS_STRING) {
            /* String Key / Associative */
            PHPWRITE(key, keylen);
        } else {
            /* Numeric Key */
            php_printf("%ld", idx);
        }
        php_printf(" is: ");
        PHPWRITE(Z_STRVAL(tmpcopy), Z_STRLEN(tmpcopy));
        php_printf("\n");
        /* 销毁原来的副本 */
        zval_dtor(&tmpcopy);
    }
}

int zend_hash_del(HashTable *ht, char *arKey, uint nKeyLen);
int zend_hash_index_del(HashTable *ht, ulong h);

int sample_strvec_handler(int argc, char **argv TSRMLS_DC)
{
    HashTable *ht;
    /* 为哈希表分配空间 */
    ALLOC_HASHTABLE(ht);
    /* 初始化哈希表的内部状态 */
    if (zend_hash_init(ht, argc, NULL,
                        ZVAL_PTR_DTOR, 0) == FAILURE) {
        FREE_HASHTABLE(ht);
        return FAILURE;
    }
    /* 把每个字符串变成zval* */
    while (argc) {
        zval *value;
        MAKE_STD_ZVAL(value);
        ZVAL_STRING(value, argv[argc], 1);
        argv++;
        if (zend_hash_next_index_insert(ht, (void**)&value,
                            sizeof(zval*)) == FAILURE) {
            /* 对于分配失败的情况应该跳掉 */
            zval_ptr_dtor(&value);
        }
    }
    /* Do some work */
    process_hashtable(ht);
    /* 毁坏哈希表
     * 释放所有的分配的空旷 */
    zend_hash_destroy(ht);
    /* Free the HashTable itself */
    FREE_HASHTABLE(ht);
    return SUCCESS;
}

int zend_hash_minmax(HashTable *ht, compare_func_t compar,
                        int flag, void **pData TSRMLS_DC);

int fname_compare(zend_function *a, zend_function *b TSRMLS_DC)
{
    return strcasecmp(a->common.function_name, b->common.function_name);
}
void php_sample_funcname_sort(TSRMLS_D)
{
    zend_function *fe;
    if (zend_hash_minmax(EG(function_table), fname_compare,
                0, (void **)&fe) == SUCCESS) {
        php_printf("Min function: %s\n", fe->common.function_name);
    }
    if (zend_hash_minmax(EG(function_table), fname_compare,
                1, (void **)&fe) == SUCCESS) {
        php_printf("Max function: %s\n", fe->common.function_name);
    }
}

typedef void (*sort_func_t)(void **Buckets, size_t numBuckets,
            size_t sizBucket, compare_func_t comp TSRMLS_DC);
int zend_hash_sort(HashTable *ht, sort_func_t sort_func,
        compare_func_t compare_func, int renumber TSRMLS_DC);