# APCUIterator::__construct

(PECL apcu >= 5.0.0)

APCUIterator::__construct — Constructs an APCUIterator iterator object

### 说明

public APCUIterator::__construct(
array|string|null `$search` = `null`,
int `$format` = APC_ITER_ALL,
int `$chunk_size` = 100,
int `$list` = APC_LIST_ACTIVE
)

Constructs an APCUIterator object.

### 参数

`search`
  Either a PCRE regular expression that matches against APCu key names, given as a string. Or an array of strings with APCu key names. Or, optionally `null` to skip the search.
`format`
  The desired format, as configured with one or more of the APC_ITER_* constants.
`chunk_size`
  The chunk size. Must be a value greater than 0. The default value is 100.
`list`
  The type to list. Either pass in `APC_LIST_ACTIVE` or `APC_LIST_DELETED`.

### 示例

示例 #1 A APCUIterator::__construct() example

`<?php
foreach (new APCUIterator('/^counter\./') as $counter) {
echo "$counter[key]: $counter[value]\n";
apc_dec($counter['key'], $counter['value']);
}
?>`

### 参见

- apcu_exists() - Checks if entry exists
- apcu_cache_info() - 从 APCu 存储中获取缓存信息

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