# Ev::run

(PECL ev >= 0.2.0)

Ev::run — Begin checking for events and calling callbacks for the default loop

### 说明

final public static Ev::run( int `$flags` = ?): void

Begin checking for events and calling callbacks for the default loop. Returns when a callback calls Ev::stop() method, or the flags are nonzero(in which case the return value is true) or when there are no active watchers which reference the loop( EvWatcher::keepalive() is `true`), in which case the return value will be `false`. The return value can generally be interpreted as if `true`, there is more work left to do.

### 参数

`flags`

  Optional parameter `flags` can be one of the following:

  List for possible values of `flags`
  `flags` | Description
  --- | ---
  `0` | The default behavior described above
  `Ev::RUN_ONCE` | Block at most one(wait, but don't loop)
  `Ev::RUN_NOWAIT` | Don't block at all(fetch/handle events, but don't wait)

  See the run flag constants.

### 返回值

没有返回值。

### 参见

- Ev::stop() - Stops the default event loop
- EvLoop::run() - Begin checking for events and calling callbacks for the loop

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