PHP命令怎么限制执行时间_PHP设置命令执行超时时间方法

function execWithTimeout($cmd, $timeout = 10) {
    $descriptors = [
        0 => ["pipe", "r"], // stdin
        1 => ["pipe", "w"], // stdout
        2 => ["pipe", "w"]  // stderr
    ];
<pre class='brush:php;toolbar:false;'>$process = proc_open($cmd, $descriptors, $pipes);
if (!is_resource($process)) {
    return ['code' => -1, 'output' => '', 'error' => '无法启动进程'];
}

$start = time();
$output = $error = '';

while (true) {
    if (feof($pipes[1]) && feof($pipes[2])) {
        break;
    }

    $read = [$pipes[1], $pipes[2]];
    $ready = stream_select($read, $write, $except, 1); // 每次最多等1秒

    if ($ready > 0) {
        if (in_array($pipes[1], $read)) {
            $output .= fread($pipes[1], 1024);
        }
        if (in_array($pipes[2], $read)) {
            $error .= fread($pipes[2], 1024);
        }
    }

    if ((time() - $start) > $timeout) {
        proc_terminate($process, 9); // 强制终止
        fclose($pipes[1]);
        fclose($pipes[2]);
        proc_close($process);
        return ['code' => -1, 'output' => $output, 'error' => "执行超时（>{$timeout}s）"];
    }
}

$returnCode = proc_close($process);
return ['code' => $returnCode, 'output' => $output, 'error' => $error];

$cmd = "timeout 5s ping -c 5 google.com";
$output = shell_exec($cmd);
$returnCode = $?; // 注意：需通过其他方式获取返回码

set_time_limit(15); // 整个脚本最多运行15秒
// 或在php.ini中设置 max_execution_time = 15