Implement a simple calculator in php-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

Implement a simple calculator in php

不言

Apr 03, 2018 am 11:48 AM

phpSimplecalculator

This article introduces the code to implement a simple calculator using PHP. I share it with you here and give it to friends in need. Let’s take a look together.

<html>
<head>
    <title>PHP实现简单的计算器</title>
    <meata http-equiv="Content-Type" content="text/html;charset=utf-8"></meata>
</head>
<?php
    $num1=true;
    $num2=true;
    $numa=true;
    $numb=true;
    $message="";
    //单路分支
    if(isset($_GET["sub"])){
        if($_GET["num1"]==""){
            $num1=false;
            $message.="第一个数字不能为空";
        }
        if(!is_numeric($_GET["num1"])){
            $numa=false;
            $message.="第一个不是数字";
        }
        if($_GET["num2"]==""){
            $num2=false;
            $message.="第二个不能为空";
        }
        if(!is_numeric($_GET["num2"])){
            $numb=false;
            $message.="第二个不是数字";
        }
        if($num1 && $num2 && $numa && $numb){
            $sum=0;
            //多路分支swith
            switch($_GET["ysf"]){
                case "+":
                    $sum=$_GET["num1"]+$_GET["num2"];
                    break;
                case "-":
                    $sum=$_GET["num1"]-$_GET["num2-"];
                    break;
                case "x":
                    $sum=$_GET["num1"]*$_GET["num2"];
                    break;
                case "/":
                    $sum=$_GET["num1"]/$_GET["num2"];
                    break;
                case "%":
                    $sum=$_GET["num1"]%_GET["num2"];
                    break;
            }
        }
    }

?>
<body>
<table align="center" border="1" sidth="500">
    <caption><h1 id="计算器">计算器</h1></caption>
    <form action="test.php">
        <tr>
            <td>
                <input type="text" size="5" name="num1" value="<?php echo $_GET[num1] ?>"
            </td>
            <td>
                <select name="ysf">
                    <option value="+" <?php if($_GET["ysf"]=="+") echo "selected" ?>>+</option>
                    <option value="-" <?php if($_GET["ysf"]=="-") echo "selected" ?>>-</option>
                    <option value="x" <?php echo $_GET["ysf"]=="x"?"selected":"" ?>>x</option>
                    <option value="/" <?php echo $_GET["ysf"]=="/"?"selected":"" ?>>/</option>
                    <option value="%" <?php echo $_GET["ysf"]=="%"?"selected":"" ?>>%</option>
                </select>
            </td>
            <td>
                <input type="text" size="5" name="num2" value="<?php echo $_GET["num2"] ?>">
            </td>
            <td>
                <input type="submit" name="sub" value="计算">
            </td>
        </tr>

        <?php
            if(isset($_GET["sub"])){
                echo &#39;<tr><TD colspan="5">&#39;;
                if($num1 && $num2 && $numa && $numb){
                    echo "结果：".$_GET["num1"]." ".$_GET["ysf"]." ".$_GET["num2"]." = ".$sum;
                }else{
                    echo $message;
                }
                echo &#39;</td></tr>&#39;;
            }
        ?>
    </form>
</table>
</body>
</html>


/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/3/27
 * Time: 16:26
 *
 */

Related recommendations:

How to implement the calculator function in javascript

How to implement a simple calculator in HTML

The above is the detailed content of Implement a simple calculator in php. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

PHP Dependency Injection Container: A Quick StartMay 13, 2025 am 12:11 AM

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Dependency Injection vs. Service Locator in PHPMay 13, 2025 am 12:10 AM

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHP performance optimization strategies.May 13, 2025 am 12:06 AM

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHP Email Validation: Ensuring Emails Are Sent CorrectlyMay 13, 2025 am 12:06 AM

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl

How to make PHP applications fasterMay 12, 2025 am 12:12 AM

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

PHP Performance Optimization Checklist: Improve Speed NowMay 12, 2025 am 12:07 AM

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

PHP Dependency Injection: Improve Code TestabilityMay 12, 2025 am 12:03 AM

Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

PHP Performance Optimization: Database Query OptimizationMay 12, 2025 am 12:02 AM

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi

See all articles