PHP. Руководство по PHP. 2005

Arrays Пред.

Глава 53. Creating Variables

След.

Arrays

Arrays are stored using Zend's internal hash tables, which can be

accessed using the zend_hash_*() API. For every

array that you want to create, you need a new hash table handle,

which will be stored in the ht member of the

zval.value container.

There's a whole API solely for the creation of arrays, which is extremely

handy. To start a new array, you call

array_init().

zval *new_array;
MAKE_STD_ZVAL(new_array);
array_init(new_array);

array_init() always returns SUCCESS.

To add new elements to the array, you can use numerous functions,

depending on what you want to do.

Табл. 53-1,

Табл. 53-2 and

Табл. 53-3

describe these functions. All functions return

FAILURE on failure and

SUCCESS on success.

Таблица 53-1. Zend's API for Associative Arrays

Function	Description
- add_assoc_long(zval array, char key, long n);()	Adds an element of type long.
- add_assoc_unset(zval array, char key);()	Adds an unset element.
- add_assoc_bool(zval array, char key, int b);()	Adds a Boolean element.
- add_assoc_resource(zval array, char key, int r);()	Adds a resource to the array.
- add_assoc_double(zval array, char key, double d);()	Adds a floating-point value.
- add_assoc_string(zval array, char key, char *str, int duplicate);()	- Adds a string to the array. The flag duplicate specifies whether the string contents have to be copied to Zend internal memory.
- - add_assoc_stringl(zval array, char key, char *str, uint length, int duplicate); ()	- Adds a string with the desired length length to the array. Otherwise, behaves like add_assoc_string().
add_assoc_zval(zval array, char key, zval *value);()	Adds a zval to the array. Useful for adding other arrays, objects, streams, etc...

Таблица 53-2. Zend's API for Indexed Arrays, Part 1

Function	Description
add_index_long(zval *array, uint idx, long n);()	Adds an element of type long.
add_index_unset(zval *array, uint idx);()	Adds an unset element.
add_index_bool(zval *array, uint idx, int b);()	Adds a Boolean element.
add_index_resource(zval *array, uint idx, int r);()	Adds a resource to the array.
add_index_double(zval *array, uint idx, double d);()	Adds a floating-point value.
add_index_string(zval array, uint idx, char str, int duplicate);()	Adds a string to the array. The flag duplicate specifies whether the string contents have to be copied to Zend internal memory.
add_index_stringl(zval array, uint idx, char str, uint length, int duplicate);()	Adds a string with the desired length length to the array. This function is faster and binary-safe. Otherwise, behaves like add_index_string()().
add_index_zval(zval array, uint idx, zval value);()	Adds a zval to the array. Useful for adding other arrays, objects, streams, etc...

Таблица 53-3. Zend's API for Indexed Arrays, Part 2

Function	Description
add_next_index_long(zval *array, long n);()	Adds an element of type long.
add_next_index_unset(zval *array);()	Adds an unset element.
add_next_index_bool(zval *array, int b);()	Adds a Boolean element.
add_next_index_resource(zval *array, int r);()	Adds a resource to the array.
add_next_index_double(zval *array, double d);()	Adds a floating-point value.
add_next_index_string(zval array, char str, int duplicate);()	Adds a string to the array. The flag duplicate specifies whether the string contents have to be copied to Zend internal memory.
add_next_index_stringl(zval array, char str, uint length, int duplicate);()	Adds a string with the desired length length to the array. This function is faster and binary-safe. Otherwise, behaves like add_index_string()().
add_next_index_zval(zval array, zval value);()	Adds a zval to the array. Useful for adding other arrays, objects, streams, etc...

All these functions provide a handy abstraction to Zend's internal hash

API. Of course, you can also use the hash functions directly - for example, if

you already have a zval container allocated that you want to

insert into an array. This is done using zend_hash_update()()

for associative arrays (see Прим. 53-3) and

zend_hash_index_update() for indexed arrays

(see Прим. 53-4):

Пример 53-3. Adding an element to an associative array.

zval *new_array, *new_element;
char *key = "element_key";
MAKE_STD_ZVAL(new_array);
MAKE_STD_ZVAL(new_element);
array_init(new_array);
ZVAL_LONG(new_element, 10);
if(zend_hash_update(new_array->value.ht, key, strlen(key) + 1, (void *)&new_element, sizeof(zval *), NULL) == FAILURE)
{
// do error handling here
}

Пример 53-4. Adding an element to an indexed array.

zval *new_array, *new_element;
int key = 2;
MAKE_STD_ZVAL(new_array);
MAKE_STD_ZVAL(new_element);
array_init(new_array);
ZVAL_LONG(new_element, 10);
if(zend_hash_index_update(new_array->value.ht, key, (void *)&new_element, sizeof(zval *), NULL) == FAILURE)
{
// do error handling here
}

To emulate the functionality of

add_next_index_*(), you can use this:

zend_hash_next_index_insert(ht, zval **new_element, sizeof(zval *), NULL)

Note: To return arrays from a function, use array_init() and

all following actions on the predefined variable return_value

(given as argument to your exported function; see the earlier discussion of the call interface). You do not have to use

MAKE_STD_ZVAL on this.

Tip: To avoid having to

write new_array->value.ht every time, you can

use HASH_OF(new_array), which is also recommended for

compatibility and style reasons.

Booleans

Objects

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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