lte-exam-chapter-12.php

#!/usr/bin/php
<?php

$terms = [
    "LTE网络规划重点场景是“五高一地”，指得是高校、高铁、高速、高架、高层和" => "地铁",
    "LTE规划的建网目标是" => "热点区域连续覆盖",
    "基站覆盖估算的目的是从覆盖的角度计算所需基站的数目，公式为规划覆盖面积除以" => "单基站的覆盖面积",
    "LTE的覆盖能力的影响因素有：发射功率、频率、多天线、RB资源、带宽及信道配置、RRM算法、子帧结构和" => "配置",
    "LTE使用高频段时，其覆盖范围变" => "小",
    "容量计算是通过计算满足一定话务需求所需要的无线资源数目，进而计算出所需要的载波配置、" => "基站数目",
    "话务需求，即话务模型，包括两个方面：用户行为和" => "业务特征",
    "容量估算的三要素（三者间用中文顿号间隔）" => "话务模型、无线资源、资源占用方式",
    "衡量无线系统的容量能力有两个维度：吞吐率和" => "用户数",
    "在20MHz带宽内，LTE理论峰值速率，上行可达到" => "50Mbps",
    "在20MHz带宽内，LTE理论峰值速率，下行可达到" => "100Mbps",
    "在20MHz带宽内，LTE实测峰值速率，当天线配置为2x2时，下行可达到" => "80Mbps",
    "在20MHz带宽内，LTE实测峰值速率，当天线配置为2x2时，上行可达到" => "20Mbps",
    "LTE规划选址有两种情况：存在可利用的旧站址和" => "完全新建站址",
    "对于无线网络规划仿真，一般包括：无线环境的仿真、网络设备的仿真和" => "用户业务过程的仿真",
    "高铁以350km/h的速度移动，在D频段会产生多少Hz的多普勒频率偏移" => "1685",
    "高铁以350km/h的速度移动，在F频段会产生多少Hz的多普勒频率偏移" => "1231",
    "LTE信号穿透CRH5高铁车型，会有多少dB损耗" => "22",
    "LTE信号穿透汽车，会有约多少dB损耗" => "10",
    "高层场景，为了提高高层深度覆盖和小区吞吐率，有以下几种在方案：3D-MIMO技术，双路MIMO或错层MIMO方案，" => "漏缆方案"
];

system("clear");
$name = readline("Input Your Exam Name（Like: 04-张三）: ");
system("date");
$time_start = time();
$count = count($terms);

echo PHP_EOL;
echo "Hello, $name!";
echo PHP_EOL;
$line = "Init";
$i = 0;

// while ($term = current($terms)) {
    // $key = key($terms);
while ($key = array_rand($terms)) {
    $term = $terms[$key];
	$i++;
    while ($line !== $term) {
        if ($line !== "Init") {
            echo "Wrong! Try again!" . PHP_EOL;
        }
        $line = readline("$i/$count. $key: ");
    }
    echo "Good!";
    $line = "Init";
    echo PHP_EOL;
    // next($terms);
    unset($terms[$key]);
}

system("date");
$time_end = time();
echo PHP_EOL;
$seconds = $time_end - $time_start;
echo "$name, you finished the test in " . $seconds . " seconds!";
echo PHP_EOL;
echo "Great!!!";
echo PHP_EOL;

$content = "$name: $seconds seconds, " . date('Y-m-d H:i:s', $time_start) . ', ' . date('Y-m-d H:i:s', $time_end) . "\n";
file_put_contents('./' . basename(__FILE__, '.php') . '.log', $content, FILE_APPEND | LOCK_EX);

while (true) { readline(); }