21个实用PHP代码
21个实用PHP代码
整理自网络ChatGPT产生之内容，文本内容不具备参考意义，程序内容及代码片段有且仅有借鉴意义。
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 12:50:02 整理自网络ChatGPT产生之内容，文本内容不具备参考意义，程序内容有且仅有借鉴意义。
