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  • 2018.5.14 PHP基础学习

    1.使用PHP输出HTML

    使用PHP输出一个表格，并且通过style标签改变字体

    <!--思考与练习-->

<style type="text/css">
    table{
        font-family:"黑体";
        font-size: 23px;
        color: red;
    }

    a{
        font-family: "幼圆";
        font-size: 100px;
    }
</style>

<?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/10
 * Time: 下午5:39
 */
$XH="081101";
    echo "<script>";
    echo "('我是Legend')";
    echo "</script>";
    echo "<table width=200 border=1 align=center>";
    echo "<tr><td>学号</td><td>姓名</td><td>性别</td></tr>";
    echo "<tr><td>$XH</td><td>王林</td><td>男</td></tr>";
    echo "<tr><td>081102</td><td>程明</td><td>男</td></tr>";
    echo "</table>";
    echo "<a href='www.baidu.com'>sss</a>";
?>

    2.在HTML中嵌入PHP代码

    <html>
<head>
    <title>HTML中嵌入PHP</title>
</head>
<body>
    <?php
    /**
     * 在文本框中输出PHP内容
     * Created by PhpStorm.
     * User: qichunlin
     * Date: 2018/5/10
     * Time: 下午5:44
     */
    $XH="081101";
    ?>
    学号:<input type="text" name="tx" size="20" value="<?php echo $XH?>"><br/>
</body>
</html>

    3.PHP变量的使用

    由用户输入一元二次方程的系数，根据系数求一元二次方程的解，测试运行结果

    <html>
<body>
<div>
    <font size="5" color="aqua" face="宋体"><p align="center">计算一元二次方程式</p></font>
</div>
<form action="" method="post">
    <table border="1" align="center" cellpadding="0">
        <tr>
            <td colspan="2" align="center" bgcolor="#999999">输入表单</td>
        </tr>
        <tr>
            <td>系数a:</td>
            <td><input type="text" name="a"></td>
        </tr>
        <tr>
            <td>系数b:</td>
            <td><input type="text" name="b"></td>
        </tr>
        <tr>
            <td>系数c:</td>
            <td><input type="text" name="c"></td>
        </tr>
        <tr>
            <td colspan="2" align="center">
                <input type="submit" name="submit" value="Submit">
                <input type="reset" name="reset" value="Reset"></td>
        </tr>
    </table>
    <br/><br/><br/>
</form>
</body>
</html>

<?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/12
 * Time: 下午5:27
 */
if (isset($_POST['submit'])) {
    $a = $_POST['a'];
    $b = $_POST['b'];
    $c = $_POST['c'];
    $result = $b * $b - 4 * $a * $c;
    if ($result >= 0) {
        $x1 = (-$b + sqrt($result)) / (2 * $a);
        $x2 = (-$b - sqrt($result)) / (2 * $a);
        echo "<script>alert('Enter a Number:a=" . $a . " ,b=" . $b . " ,c=" . $c . ";The Result is:x=" . $x1 . ",x2=" . $x2 . "');</script>";
    } else {
        echo "<script>alert('方程无解');</script>";
    }
}
?>
<table align="center" border="1">
    <th colspan="2">Data Result</th>
    <tr>
        <td>One Root:</td>
        <td><input type="text" disabled="disabled" value=<?php echo $x1; ?>></td>
    </tr>
    <tr>
        <td>Two Root:</td>
        <td><input type="text" disabled="disabled" value=<?php echo $x2; ?>></td>
    </tr>
</table>

    3.2获取登陆表单中的用户名和密码，如果用户名是“admin” 密码是“12345” 就显示登录成功

    <!--登陆表单-->
<html>
<body>
<form action="" method="post">
    <table border="1" align="center" cellspacing="0" cellpadding="0">
        <tr>
            <td colspan="2" align="center" bgcolor="#999999">用户登陆表单</td>
        </tr>
        <tr>
            <td>用户名:</td>
            <td><input type="text" name="username"></td>
        </tr>
        <tr>
            <td>密码:</td>
            <td><input type="password" name="password"></td>
        </tr>
        <tr>
            <td colspan="2" align="center">
                <input type="submit" name="submit" value="Submit">
                <input type="reset" name="submit2" value="Reset"></td>
        </tr>
    </table>
    <br/><br/><br/>
</form>
</body>
</html>

<?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/8
 * Time: 下午10:31
 */
if (isset($_POST['submit'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];
    if ($username == "admin" && $password == "123456") {
        echo "<script>alert('Successful Login');</script>";
    } else {
        echo "<script>alert('Failure Login');</script>";
    }
}
?>

    4.函数的定义与使用

    定义一个函数，用于比较两个数的大小

    <html>
<title>实验3_5思考与练习</title>
<body>
<form action="" method="post">
    <div><font>比较两个的大小数</font></div>
    Number1:<input type="text" name="num1"><br><br>
    Number2:<input type="text" name="num2"><br><br>
    <input type="submit" name="submit" value="Submit">

</form>

</body>
<?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/12
 * Time: 下午2:03
 */

if (isset($_POST['submit'])) {
    $num1 = $_POST['num1'];
    $num2 = $_POST['num2'];
    $a = Comp($num1, $num2);

}
function Comp($num1, $num2)
{
    if ($num1 > $num2) {
        $bool = $num1;
    } else {
        $bool = $num2;
    }
    echo "比较结果:<input type='text' value='{$bool}'>";

}

?>
</html>

    4.2排序函数，接收用户输入的值使用该函数对其进行排序

    <!--实验3.5-->
<?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/11
 * Time: 下午8:16
 */
//定义排序函数
function my_sort($array)
{
    for ($i = 0; $i < count($array); $i++) {
        for ($j = $i + 1; $j < count($array); $j++) {
            //判断大小  交换值
            if ($array[$i] > $array[$j]) {
                $temp = $array[$j];
                $array[$j] = $array[$i];
                $array[$i] = $temp;
            }
        }
    }
    return $array;//返回排序后的数组
}

echo "请输入需要排序的数据：<br/>";
echo "<form method='post'> ";
for ($i = 1; $i < 6; $i++) {
    //文本框的名字是数组名
    echo "<input type='text' name='stu[]' size='5'>";
    if ($i < 5)
        echo "-";
}
echo "<input type='submit' name='bt' value='提交'  >";
echo "</form>";
if (isset($_POST['bt'])) {
    $stu = $_POST['stu'];
    $arr_stu = my_sort($stu);
    echo "排序后的数据如下图所示:<br/>";
    while (list($key, $value) = each($arr_stu)) {
        echo $value . "<br/>";//输出排序后的值
    }
}
?>

    5.流程控制

    计算从1开始到指定整数的累加和，指定数字有用户输入

    <html>
<body>
<div><font size=4 color=blue face="黑体"><p align=center>计算累加和</font></div>
<form action="" method="post">
    <p align="center">
    1+2+....+<input type="text" name="num"  size="5">
    <input type="submit" name="submit" value="计算">
    </p>
</form>
</body>
</html>

<?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/10
 * Time: 下午6:39
 */
if(isset($_POST['submit'])) {
    $num=$_POST['num'];
    $i=0;
    $sum = 0;
    if($num<=2)
        echo "<script>alert('请输入大于2的数字')</script>";
    else{
        while ($i<$num){
            $sum=$sum+$i;
            $i++;
        }
        echo "<script>alert('1+2+...+$num=$sum');</script>";
    }

}
?>

    5.2计算一个指定整数的阶乘，要求先判断用户的输入是否不等于0的整数

    <html>
<title>实验3_4思考与练习</title>
<style type="text/css">
    .btn {
        font-family: "黑体";
         150px;
        height: 50px;
        font-size: 30px;
    }
</style>
<body>
<div><font size=4 color=blue face="黑体"><p align=center>计算求阶乘</font></div>
<form action="" method="post">
    <p align="center">
        Input Number:<input type="text" name="num" value=""><br><br>
        <input type="submit" class="btn" name="submit" value="Submit">
    </p>
</form>
</body>
</html>

<?php
if (isset($_POST['submit'])) {
    $num = $_POST['num'];
    //$i=0;
    if ($num > 0) {
        $result = 1;
        for ($i = 1; $i <= $num; $i++) {
            $result = $result * $i;
        }
    }

}
?>
<p align="center">
    The Result is:<input type="text" disabled="disabled" size="20px" value="<?php echo $result; ?>">
</p>

    6.php输出乘法表

    <?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/07
 * Time: 下午7:39
 */
    for ($i=1;$i<=9;$i++){
        for ($j=1;$j<=$i;$j++){
            echo "$i * $j=".$i*$j."&nbsp";
            if ($i == $j)
            echo "<br>";//九九乘法表
        }
    }
?>

    7.PHP实例-----多项选择题

    优化解决了进入网页显示请选择答案后的错误答案

    <!DOCTYPE html>
<title>H5 表单，包含五个复选框和一个提交按钮</title>
<form action="" method="post">
    以下属于Web开发语言的有哪几种?<br/>
    <input type="checkbox" id = 'answer' name="answer" value="C语言">C语言<br>
    <input type="checkbox" id = 'answer' name="answer" value="PHP">PHP<br>
    <input type="checkbox" id = 'answer' name="answer" value="FLASH">FLASH<br>
    <input type="checkbox" id = 'answer' name="answer" value="ASP">ASP<br>
    <input type="checkbox" id = 'answer' name="answer" value="JSP">JSP<br>
    <input type="submit" name="bt_answer" id="btn" style=" 100px" value="提交">
</form>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"
        integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
        crossorigin="anonymous"></script>
<script>
    $('#btn').on('click',function () {
        var check_val = [];
        var temp = '';
        $('input[name="answer"]:checked').each(function () {
            check_val.push($(this).val());
            temp+=$(this).val();
        });
        if(check_val.length == 0){
            alert('请选择');
        }else{
            if(temp == 'PHPASPJSP'){
                alert('回答正确');
            }else{
                alert('回答错误');
            }
        }
    })
</script>

<?php
/**
 * Created by PhpStorm.
 * User: qichunlin
 * Date: 2018/5/10
 * Time: 下午2:13
 */

//if (isset($_POST['bt_answer'])) {
//    $answer = @$_POST['answer'];
//    if (empty($answer))
//        echo "<script> alert('答案不能为空！')</script>";
//    $nun = count($answer);
//    $anw = "";
//    for ($i = 0; $i < $num; $i++) {
//        $anw = $anw . $anwser[$i];
//    }
//
//    if ($anw == "PHPASPJSP") {
//        echo "<script> alert('回答正确！')</script>";
//    } else {
//        echo "<script> alert('回答错误！')</script>";
//    }
//}

?>
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  • 原文地址：https://www.cnblogs.com/qichunlin/p/9029513.html
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