Returns active resources

# get_resources

(PHP 7, PHP 8)

get_resources — Returns active resources

### 说明

function get_resources(?string `$type` = `null`): array

Returns an array of all currently active resources, optionally filtered by resource type.

> 注意: This function is meant for debugging and testing purposes. It is not supposed to be used in production environments, especially not to access or even manipulate resources which are normally not accessible (e.g. the underlying stream resource of SplFileObject instances).

### 参数

`type`

  If defined, this will cause get_resources() to only return resources of the given type. A list of resource types is available.

  If the string `Unknown` is provided as the type, then only resources that are of an unknown type will be returned.

  If omitted, all resources will be returned.

### 返回值

Returns an array of currently active resources, indexed by resource number.

### 更新日志

版本 | 说明
--- | ---
8.0.0 | `type` is nullable now.

### 示例

示例 #1 Unfiltered get_resources()

    <?php
    $fp = tmpfile();
    var_dump(get_resources());
    ?>

以上示例的输出类似于：

    array(1) {
      [1]=>
      resource(1) of type (stream)
    }

示例 #2 Filtered get_resources()

    <?php
    $fp = tmpfile();
    var_dump(get_resources('stream'));
    var_dump(get_resources('curl'));
    ?>

以上示例的输出类似于：

    array(1) {
      [1]=>
      resource(1) of type (stream)
    }
    array(0) {
    }

### 参见

- get_loaded_extensions() - 返回所有编译并加载模块名的 array
- get_defined_constants() - 返回所有常量的关联数组，键是常量名，值是常量值
- get_defined_functions() - 返回所有已定义函数的数组
- get_defined_vars() - 返回由所有已定义变量所组成的数组

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