PHP简易计算器

实现思路：
1.运用JS处理页面操作逻辑、收集必要的计算参数；
2.将参数传给PHP后端处理并返回结果；
3.将结果展示到前端页面。

PHP代码

<?php
  @$n1 = $_GET["n1"];
  @$n2 = $_GET["n2"];
  @$f = $_GET["fu"];
  //计算函数
  function calc($n_1,$n_2,$fu){
    if(empty($n_1) || empty($n_2) || empty($fu)){
      return "";   
    }else{
        $r = 0;
        switch ($fu) {
            case 'and':
                $r = $n_1 + $n_2;
                break;
            case 'minus':
                $r = $n_1 - $n_2;
                break;
            case 'times':
                $r = $n_1 * $n_2;
                break;
            case 'into':
                $r = $n_1 / $n_2;
                break;
            default:
                $r = 0;
                break;
        }
        return $r;
    }
  }
?>

HTML代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title>计算器（PHP版）</title>
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.6.0/css/bootstrap.css" rel="stylesheet">
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
    <style>.row{padding:12px;}</style>
</head>
<body style="background:#313131;color:#9b9b9b;">
    <div class="container clear" style="padding-top:20px; padding-bottom:20px;">
        <div class="row">
            <div class="col-12">计算器（PHP版）</div>
        </div>
        <div class="row">
            <div class="col-12"><input type="text" id="input" value="<?= calc($n1,$n2,$f) ?>" class="form-control" style="text-align:right;"></div>
        </div>
        <div class="row">
            <div class="col-3"><button onclick="getBtn(7)" type="button" class="btn btn-lg btn-block btn-secondary">7</button></div>
            <div class="col-3"><button onclick="getBtn(8)" type="button" class="btn btn-lg btn-block btn-secondary">8</button></div>
            <div class="col-3"><button onclick="getBtn(9)" type="button" class="btn btn-lg btn-block btn-secondary">9</button></div>
            <div class="col-3"><button onclick="getBtn('+')" type="button" class="btn btn-lg btn-block btn-danger">+</button></div>
        </div>
        <div class="row">
            <div class="col-3"><button onclick="getBtn(4)" type="button" class="btn btn-lg btn-block btn-secondary">4</button></div>
            <div class="col-3"><button onclick="getBtn(5)" type="button" class="btn btn-lg btn-block btn-secondary">5</button></div>
            <div class="col-3"><button onclick="getBtn(6)" type="button" class="btn btn-lg btn-block btn-secondary">6</button></div>
            <div class="col-3"><button onclick="getBtn('-')" type="button" class="btn btn-lg btn-block btn-warning">-</button></div>
        </div>
        <div class="row">
            <div class="col-3"><button onclick="getBtn(1)" type="button" class="btn btn-lg btn-block btn-secondary">1</button></div>
            <div class="col-3"><button onclick="getBtn(2)" type="button" class="btn btn-lg btn-block btn-secondary">2</button></div>
            <div class="col-3"><button onclick="getBtn(3)" type="button" class="btn btn-lg btn-block btn-secondary">3</button></div>
            <div class="col-3"><button onclick="getBtn('*')" type="button" class="btn btn-lg btn-block btn-info">×</button></div>
        </div>
        <div class="row">
            <div class="col-3"><button onclick="getBtn('.')" type="button" class="btn btn-lg btn-block btn-secondary">.</button></div>
            <div class="col-3"><button onclick="getBtn(0)" type="button" class="btn btn-lg btn-block btn-secondary">0</button></div>
            <div class="col-3"><button onclick="getBtn('=')" type="button" class="btn btn-lg btn-block btn-success">=</button></div>
            <div class="col-3"><button onclick="getBtn('/')" type="button" class="btn btn-lg btn-block btn-primary">÷</button></div>
        </div>
        <div style="text-align:center;margin-top:20px;color:#9b9b9b;font-size:12px;">©2021 CopyRight PHP中文网</div>
    </div>
</body>
</html>

JS代码

<script>
var n1 = "";//第一个数
var n2 = "";//第二个数
var n3 = "";//当前数
var v3 = "";//计算结果
var fu = "";//运算符号
var bl = false;
var view = $("#input"); //显示屏
var view_val = "";
//按钮事件
function getBtn(v){
    //检查v是否为符号
    if ((typeof v=='number')&&v.constructor==Number|| v == ".") {
        //拼接数字字符串
        n3 += v.toString().concat();
        //赋值给第二个数
        if (bl){n2 = n3;}
    } else {
        if (v == "=") {
            if (n1 != "" && n2 !="") {
                //运算符号赋值;
                var ff;
                switch (fu) {
                    case '+':
                        ff = "and";
                        break;
                    case '-':
                        ff = "minus";
                        break;
                    case '*':
                        ff = "times";
                        break;
                    case '/':
                        ff = "into";
                        break;
                    default:
                        alert("错误!");
                        location.reload();
                        break;
                }
                window.location.href="calc.php?n1="+n1+"&n2="+n2+"&fu="+ff+"";
            }else{
                alert("输入错误!");
                location.reload();
            }
        }else{
            fu = v;
            //赋值给第一个数
            if (n1=="") {
                n1 = n3;
                n3 = "";
                bl = true;
            }
        }
    }
    //输出显示屏;
    if (v != '=') {
        view_val+=v;
        view.val(view_val);
    }
}
</script>

效果展示

取偶函数练习

<?php
  $arr = [23,3,45,6,78,8,34,5,6,48];
  //调用取偶函数
  print_r(getOdd($arr));
  //取偶函数
  function getOdd(array $a):array
  {
    $arr2=[];
    foreach ($a as $v) {
      if($v % 2 == 0){
        //将筛选的偶数赋值给新的数组
        array_push($arr2,$v);
      }
    }
    return $arr2;
  }
?>

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2021-07-23 20:28:13