PHP入门

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php+apache+mysql大法好.
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声明变量

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<?php
$var = 100;
$var2 = 200;
const var3 = 300;
echo $var+$var2;
echo '<br>';
echo var3;
define('var4', 9000);//宏定义
echo var4;
?>

声明函数

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<?php
function test($name){
    echo 'hello php<br>';
    echo 'hello tbl<br>';
    echo 'hello '.$name.'<br>';//字符串的连接是用.来的
    return 100;
}
function muti_var($a, $b){
    echo 'a = '.$a.' b = '.$b.'<br>';
}
function muti_var($a, $b){
    echo "a = $a, b = $b";//必须是双引号！单引号全部默认是字符串
}
test('baby');
muti_var(10, 20);

switch

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<?php
function level($score){
    echo $score/10;
    $result = 'bad';
    switch ((int)($score/10)){
        case 10:
        case 9:
            $result = 'great';
            break;
        case 8:
        case 7:
            $result = 'not bad!';
            break;
        default:
            $result = 'bad';
            break;
    }
    return $result;
}
echo level(99);

画图

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<?php
$img = imagecreate(400, 300);
imagecolorallocate($img, 255, 255, 255);
imageellipse($img, 200, 200, 50, 50, imagecolorallocate($img, 255, 0, 0));
header('Content-type: image/png');//mime type对应表
imagepng($img);

登陆系统

前端的显示界面

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
</head>
<body >
<form action="test.php" method = "post">
    <div>name:
        <input type = "text" name = "name">
    </div>
    <div>password:
        <input type = "password" name = "password">
    </div>
    <input type = "submit" value ="login">
</form>
</body>
</html>

后端连接数据库

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<?php
/**
 * Created by PhpStorm.
 * User: 宝宝天龙
 * Date: 2017/12/18
 * Time: 14:20
 */
if (!isset($_POST['name'])) {
    die('you don\'dont type anything man.');
}
if (!isset($_POST['password'])) {
    die('you don\'dont type anything man.');
}
$name_get = $_POST['name'];
$password_get = $_POST['password'];
//printf("%s %s", $name_get, $password_get);
$conne = @mysqli_connect('localhost', 'root', '');
if($conne){
    mysqli_select_db($conne, 'test');
//    $str = "'s Hertogenbosch";
//    echo $str."<br>";
//    $name_get = mysqli_escape_string($conne, $str);
//    echo $name_get.'<br>';
    $result = mysqli_query($conne, "SELECT * FROM test where name = '$name_get' ");
//    print_r($result.'<br>');
//    $result_arr = mysqli_fetch_assoc($result);
//    print_r($result_arr);
//    echo '<br>';
//    echo ''.mysqli_num_rows($result);
    $tot = mysqli_num_rows($result);
//    print_r($result_arr['name']);
    $flag = false;
    for($i=0; $i < $tot; $i++){
        $result_arr = mysqli_fetch_assoc($result);
        if ($result_arr['name'] == $name_get && $result_arr['password'] == $password_get){
            $flag = true;
            break;
        }
    }
    if($flag == true){
        echo "login successfully!";
    }
    else{
        echo "unsuccessfully!".'<br>'."hey man";
    }
}
else
    echo '未连接数据库<br>';

本文标题:PHP入门

文章作者:Babydragon

发布时间:2017-12-17, 23:05:19

最后更新:2018-03-23, 16:49:40

原始链接:http://baolintian.github.io/2017/12/17/PHP入门/

许可协议: "署名-非商用-相同方式共享 4.0" 转载请保留原文链接及作者。

文章目录
  1. 1. 声明变量
  2. 2. 声明函数
    1. 2.0.1. switch
  • 画图
  • 登陆系统
    1. 1. 前端的显示界面
    2. 2. 后端连接数据库
    • {{ live2d() }}