# EventBase::getFeatures

(PECL event >= 1.2.6-beta)

EventBase::getFeatures — Returns bitmask of features supported

### 说明

public EventBase::getFeatures(): int

Returns bitmask of features supported.

### 参数

此函数没有参数。

### 返回值

Returns integer representing a bitmask of supported features. See EventConfig::FEATURE_* constants.

### 示例

示例 #1 EventBase::getFeatures() example

`<?php
// Avoiding "select" method
$cfg = new EventConfig();
if ($cfg->avoidMethod("select")) {
echo "'select' method avoided\n";
}
$base = new EventBase($cfg);
echo "Features:\n";
$features = $base->getFeatures();
($features & EventConfig::FEATURE_ET) and print "ET - edge-triggered IO\n";
($features & EventConfig::FEATURE_O1) and print "O1 - O(1) operation for adding/deleting events\n";
($features & EventConfig::FEATURE_FDS) and print "FDS - arbitrary file descriptor types, and not just sockets\n";
?>`

### 参见

- EventBase::getMethod() - Returns event method in use
- EventConfig

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