event_add

(PECL libevent >= 0.0.1)

event_add — Add an event to the set of monitored events

说明

event_add ( resource $event [, int $timeout = -1 ] ) : bool

event_add() schedules the execution of the event when the event specified in event_set() occurs or in at least the time specified by the timeout argument. If timeout was not specified, not timeout is set. The event must be already initalized by event_set() and event_base_set() functions. If the event already has a timeout set, it is replaced by the new one.

参数

event: Valid event resource.
timeout: Optional timeout (in microseconds).

返回值

event_add() returns TRUE on success or FALSE on error.

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User Contributed Notes 1 note

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zhaoyong dot lc at gmail dot com ¶

6 years ago


This is a Timer example use pcntl and libevent

function newChild($func_name) {
    echo "enter newChild\n";
    $args = func_get_args();
    unset($args[0]);
    $pid =  pcntl_fork();
    if ($pid == 0) {
        function_exists($func_name) and exit(call_user_func_array($func_name, $args)) or exit(-1);
    } else if($pid == -1) {
        echo "Couldn't create child process";
    } else {
        return $pid;
    }
}

function on_timer() {
    echo "timer called\n";
}

/**
 * @param $func string, function name
 * @param $timeouts int, microtimes for time delay
 */
function timer($func, $timeouts){

    echo "enter timer\n";
    $base = event_base_new();
    $event = event_new();

    event_set($event, 0, EV_TIMEOUT, $func);
    event_base_set($event, $base);
    event_add($event, $timeouts);

    event_base_loop($base);
}

$pid = newChild("timer", "on_timer", 5000000);

if ($pid > 0) {
    echo "master process exit\n";
}

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官方地址：https://www.php.net/manual/en/function.event-add.php

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event_add

说明

参数

返回值

User Contributed Notes 1 note