lte-exam-3.php

#!/usr/bin/php
<?php

$terms = [
    "OFDM的英文全称为" => "Orthogonal Frequency Division Multiplexing",
    "OFDMA的英文全称为" => "Orthogonal Frequency Division Multiplexing Access",
    "LTE中子载波的频率间隔是" => "15KHz",
    "一个OFDM的符号周期（不包含CP）是多少μs（精确到小数点后两位）" => "66.67",
    "OFDM中的O的中文含义是" => "正交",
    "PRB的英文全称为" => "Physical Resource Block",
    "RB的英文全称为" => "Resource Block",
    "RE的英文全称为" => "Resource Element",
    "一个RB包含多少个RE" => "84",
    "一个物理资源块PRB，频域上包含多少个子载波" => "12",
    "LTE定义的Band 38频段，其最低频率为" => "2570MHz",
    "LTE定义的Band 38频段，其最高频率为" => "2620MHz",
    "在LTE中，帧结构时间描述的最小单位就是采样周期Ts。每个子载波为2048阶IFFT采样，所以LTE的采样周期Ts为多少μs（精确到小数点后三位）" => "0.033",
    "一个TDD-LTE无线帧周期Tf包含多少Ts" => "307200",
    "一个TDD-LTE半帧包含多少Ts" => "153600",
    "一个TDD-LTE子帧包含多少Ts" => "30720",
    "一个TDD-LTE时隙包含多少Ts" => "15360",
    "一个物理资源块PRB，时域上包含多少个OFDM符号（常规CP）" => "7",
    "一个物理资源块PRB，在时间上的长度约为" => "0.5ms",
    "LTE无线帧，在时间上的长度为" => "10ms",
    "一个LTE无线帧，包含多少个子帧" => "10",
    "一个子帧，在时间上的长度为" => "1ms",
    "一个子帧，包含多少个时隙" => "2",
    "一个时隙，在时间上的长度为" => "0.5ms",
    "一个LTE无线帧，包含多少个半帧" => "2",
    "一个半帧，在时间上的长度为" => "5ms",
    "一个半帧，包含多少个子帧" => "5",
    "特殊子帧：DwPTS + GP + UpPTS，在时间上的长度为" => "1ms",
    "LTE中，上行采用的多址技术是" => "SC-FDMA",
    "LTE中，下行采用的多址技术是" => "OFDMA",
    "TDD无线帧中的特殊子帧包含3个时隙，分别是（三者间用英文逗号间隔）" => "DwPTS,GP,UpPTS",
    "MIMO的英文全称为" => "Multiple Input Multiple Output",
    "SU-MIMO的英文全称为" => "Single User Multiple Input Multiple Output",
    "MU-MIMO的英文全称为" => "Multi User Multiple Input Multiple Output",
    "AMC的英文全称为" => "Adaptive Modulation and Coding",
    "LTE中定义的最大小区ID个数为多少个" => "504",
    "HARQ" => "Hybrid Automatic Repeat Request",
    "CP" => "Cyclic Prefix",
    "ISI" => "Inter Symbol Interference",
    "ICI" => "Inter Carrier Interference",
    "IFFT" => "Inverse Fast Fourier Transform",
    "SC-FDMA" => "Single-Carrier Frequency Division Multiple Access",
    "MCM" => "Multi-Carrier Modulation",
    "ICIC" => "Inter-Cell Interference Indication",
    "LTE的RLC和MAC之间的信道称为" => "逻辑信道",
    "LTE的MAC和PHY之间的信道称为" => "传输信道",
    "LTE的PHY层上的信道称为" => "物理信道",
    "LTE的逻辑信道中的五个控制信道为（用英文术语简称，各术语间用英文逗号间隔）" => "BCCH,PCCH,CCCH,DCCH,MCCH",
    "LTE的逻辑信道中的两个业务信道为（用英文术语简称，各术语间用英文逗号间隔）" => "DTCH,MTCH",
    "LTE的传输信道中的四个下行信道为（用英文术语简称，各术语间用英文逗号间隔）" => "BCH,PCH,DL-SCH,MCH",
    "LTE的传输信道中的两个上行信道为（用英文术语简称，各术语间用英文逗号间隔）" => "RACH,UL-SCH",
    "LTE的物理信道中的六个下行信道为：PBCH,PDCCH,PDSCH,PCFICH,PHICH和" => "PMCH",
    "LTE的物理信道中的三个上行信道为：PUCCH,PUSCH和" => "PRACH",
    "LTE中物理层小区组数为" => "168",
    "LTE中物理层每个小区组中的小区ID个数为" => "3",
    "LTE中定义的最大小区ID个数为" => "504"
];

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_end) . "\n";
file_put_contents("./lte-exam.log", $content, FILE_APPEND | LOCK_EX);

while (true) { readline(); }