PHP学习笔记之php文件操作,
一、fstat函数:显示文件的所有信息
$file_path = "test.php"; if($fp=fopen($file_path,"a+")){ $file_info=fstat($fp); echo "<pre class="brush:php;toolbar:false">"; print_r($file_info); echo ""; echo "文件大小为".$file_info['size']; echo "文件上次访问时间".date("Y-m-d H:i:s",$file_info['mtime']); } fclose($fp); //一定要关闭
二、文件读取:
//第一种: $con = fread($fp,filesize($file_path)); $con = str_replace("\r\n","<br>",$con); echo "文件内容是".$con; //第二种:将文件一下全部读取 $con = file_get_contents($file_path); $con = str_replace("\r\n","<br>",$con); echo "文件内容是".$con; //第三种:一段一段读取 $buffer = 1024; //为了下载的安全,最好使用文件字节读取计数器 $file_count = 0; //feof用于判断文件是否读取到文档尾 while(!feof($fp) && ($file_size-$file_count>0)){ $file_data = fread($fp,$buffer); //统计读了多少个字节 $file_count+$buffer; echo $file_data; }
三、写入文件:
//1、传统方法写入文件 $file_path = "test.txt"; if(file_exists($file_path)){ $fp = fopen($file_path,"a+"); //打开方式:a+是追加内容。w+是覆盖原来的。 $con = "Hello!\r\n"; fwrite($fp,$con); echo "添加成功!"; }else{ echo "文件不存在"; } fclose($fp); //2、第二种方法写入文件 $file_path= "test.txt"; $con = "北京你好!\r\n"; file_put_contents($file_path,$con,FILE_APPEND); echo "成功";
四、文件操作的应用:
//可以操作ini文件。将服务器的配置写在ini文件中,再对其进行操作。 dbc.ini host=192.168.0.1 admin=admin password=123456 demo.php <?php $con = parse_ini_file("dbc.ini"); print_r($con); ?> //将ini文件中的数据以数组形式读出,可以对其进行操作。
五、拷贝文件:
if(!copy("E:\\test.txt","D:\\1.txt")){ echo "fail"; }else{ echo "success"; }
六、创建文件
创建文件夹:
//$path = "E:\\happy"; //文件夹路径 $path = "E:\\happy\aaa\bbb"; //多级文件夹 if(!is_dir($path)){ if(mkdir($path,0777,true)){ echo "success"; }else{ echo "fail"; } }else{ echo "文件夹已存在"; }
创建文件:
$file_path = "E:\\happy.txt"; $fp = fopen($file_path,"w+"); fwrite($fp,"hello"); fclose($fp);
七、删除文件:
删除文件夹:
$path = "E:\\happy\aaa\bbb"; //多级文件夹 if(rmdir($path)){ echo "success"; } //rmdir只能删除空文件夹,文件夹下有文件或目录均不能删除。
删除文件:
$file_path = "E:\\happy.txt"; if(is_file($file_path)){ if(unlink($file_path)){ echo "success"; }else{ echo "fail"; } }else{ echo "文件不存在"; }
以上所述是小编给大家介绍的php文件操作的相关知识,希望对大家有所帮助。

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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