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21个实用PHP代码

1. 计算字符串长度: ```php $string = "Welcome to the PHP world!"; $length = strlen($string); echo $length; //输出:27 ``` 2. 字符串截取: ```php $string = "Welcome to the PHP world!"; $substring = substr($string, 0, 7); //从0开始截取,截取长度为7 echo $substring; //输出:Welcome ``` 3. 数组遍历: ```php $fruits = array("apple", "banana", "orange"); foreach($fruits as $fruit) { echo $fruit . "
"; } //输出: //apple //banana //orange ``` 4. 数组排序: ```php $numbers = array(5, 2, 8, 1, 3); sort($numbers); //升序排序 print_r($numbers); //输出:Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 5 [4] => 8 ) ``` 5. 数组查找: ```php $fruits = array("apple", "banana", "orange"); $key = array_search("banana", $fruits); echo $key; //输出:1 ``` 6. 获取当前时间戳: ```php $timestamp = time(); echo $timestamp; //输出:1631771555 ``` 7. 将时间戳格式化为日期: ```php $timestamp = time(); $date = date("Y-m-d", $timestamp); echo $date; //输出:2021-09-16 ``` 8. 获取当前文件路径: ```php $path = $_SERVER['REQUEST_URI']; echo $path; //输出:/index.php ``` 9. 获取当前文件名: ```php $filename = basename($_SERVER['SCRIPT_FILENAME']); echo $filename; //输出:index.php ``` 10. 设置Cookie: ```php setcookie("username", "John"); ``` 11. 获取Cookie: ```php $username = $_COOKIE["username"]; echo $username; //输出:John ``` 12. 删除Cookie: ```php setcookie("username", "", time() - 3600); //设置过期时间为1小时前 ``` 13. 判断是否存在指定Cookie: ```php if(isset($_COOKIE["username"])) { echo "Cookie存在"; } else { echo "Cookie不存在"; } ``` 14. 获取客户端IP地址: ```php $ip = $_SERVER['REMOTE_ADDR']; echo $ip; //输出:127.0.0.1 ``` 15. 获取客户端浏览器信息: ```php $browser = $_SERVER['HTTP_USER_AGENT']; echo $browser; //例如:Mozilla/5.0 (Windows NT 10.0; … ``` 16. 发送电子邮件: ```php $to = "someone@example.com"; $subject = "Subject"; $message = "Hello! This is a test email."; $headers = "From: sender@example.com"; mail($to, $subject, $message, $headers); ``` 17. 加密字符串: ```php $password = "123456"; $encrypted_password = md5($password); echo $encrypted_password; //输出:e10adc3949ba59abbe56e057f20f883e ``` 18. 解码URL: ```php $url = "https%3A%2F%2Fwww.baidu.com%2F"; $url_decoded = urldecode($url); echo $url_decoded; //输出:https://www.baidu.com/ ``` 19. 编码URL: ```php $url = "https://www.baidu.com/"; $url_encoded = urlencode($url); echo $url_encoded; //输出:https%3A%2F%2Fwww.baidu.com%2F ``` 20. 向数据库插入数据: ```php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB"; $conn = mysqli_connect($servername, $username, $password, $dbname); if (!$conn) { die("Connection failed: " . mysqli_connect_error()); } $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')"; if (mysqli_query($conn, $sql)) { echo "New record created successfully"; } else { echo "Error: " . $sql . "
" . mysqli_error($conn); } mysqli_close($conn); ``` 21. 从数据库中查询数据: ```php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB"; $conn = mysqli_connect($servername, $username, $password, $dbname); if (!$conn) { die("Connection failed: " . mysqli_connect_error()); } $sql = "SELECT id, firstname, lastname FROM MyGuests"; $result = mysqli_query($conn, $sql); if (mysqli_num_rows($result) > 0) { while($row = mysqli_fetch_assoc($result)) { echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "
"; } } else { echo "0 results"; } mysqli_close($conn); ```

Public @ 2023-04-01 12:51:23

如何从零开始学习DIV+CSS

CSS是样式,DIV是层.DIV+CSS是网站标准(web标准),通常为了说明与HTML网页设计语言中的表格(table)定位方式的区别.因为XHTML网站设计标准中,不再使用表格定位技术,而是采用DIV+CSS的方式实现各种定位。1:学会HTML语言,再学习DIV+CSS时会得心应手。看得懂HTML语法,那么世界上80%的网站都能被你看穿。HTML语言很好学,一定要熟记常用的一些代码,因为有了像

Public @ 2012-08-26 15:46:24

在Flash中使用ASP技术

在Flash中使用ASP技术,需要使用ActionScript代码与ASP脚本交互。其中,ActionScript代码可以向服务器发送请求,ASP脚本则可以响应请求,返回相应的数据。 下面是使用Flash和ASP技术进行数据交互的简单示例过程: 1.在Flash中创建一个文本框,输入用户名和密码,并添加一个登录按钮。 2.使用ActionScript代码编写登录按钮的单击事件处理函数。 3

Public @ 2023-04-23 06:50:15

21个实用PHP代码

1. PHP Email Validation:验证电子邮件地址是否正确。 2. PHP Image Resizing:调整图片大小,使其适合不同的设备和浏览器窗口大小。 3. PHP File Upload:上传文件到服务器,以备后续处理和下载。 4. PHP Form Handling:处理表单数据并完成数据库操作,如添加、更新和删除数据。 5. PHP Database Connec

Public @ 2023-03-26 23:50:36

精通PHP的十大要点

1. 在合适的时候使用PHP - Rasmus Lerdorf没有谁比PHP的创建者Rasmus Lerdorf明白PHP用在什么地方是更合理的, 他于1995年发布了PHP这门语言,从那时起,PHP就像燎原之火,烧遍了整个开发阵营,改变了互联网的世界。 可是, Rasmus并不是因此而创建PHP的。 PHP是为了解决web开发者的实际问题而诞生的。和许多开源项目一样,PHP变得流行,流行的动机并

Public @ 2020-08-22 15:46:36

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