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                # 如何在回調函數中訪問外部的變量 [TOC] 在swoole\_server/swoole\_client的事件回調函數中,需要讀取調用外部的變量和對象,可以通過下面的幾種方法實現。 ## 一、事件回調函數改用對象+屬性 ~~~ class Server { public $buffer; public $serv; function onReceive($serv, $fd, $from_id, $data) { //在這里可以讀取到EventCallback對象上的屬性和方法 $this->buffer[$fd] = $data; $this->hello(); } function hello() { } function run() { $serv = new swoole_server('127.0.0.1', 9501); $this->serv = $serv; $serv->on('receive', array($this, 'onReceive')); $serv->start(); } } $server= new Server; $server->run(); ~~~ ## 二、使用全局變量 ~~~ $buffer = array(); $serv->on('receive', function($serv, $fd, $from_id, $data) { global $buffer; $buffer[$fd] = $data; }); ~~~ ## 三、使用類靜態變量 ~~~ class Test { static $buffer; } $serv->on('receive', function($serv, $fd, $from_id, $data) { Test::$buffer[$fd] = $data; }); ~~~ ## 四、匿名函數中使用use語法 ~~~ $buffer = array(); $serv->on('receive', function($serv, $fd, $from_id, $data) use ($buffer) { $buffer[$fd] = $data; }); ~~~ > 需要PHP5.4或更高的版本 > 多個參數可以用逗號隔開,如use ($buffer, $users, $config) ## 五、直接保存在swoole\_server/swoole\_client對象上 ~~~ $serv->buffer = array(); $serv->on('receive', function($serv, $fd, $from_id, $data) use ($buffer) { $serv->buffer[$fd] = $data; }); ~~~
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