PHP ftp_size() 函数

PHP ftp_size() 函数返回给定文件的大小（以字节为单位）。

语法

ftp_size(ftp, filename) 

参数

返回值

成功时返回文件大小，失败时返回-1错误。

示例:

下面的示例显示了ftp_size()函数的用法。

<?php
//要使用的FTP服务器
$ftp_server = "ftp.example.com";

//FTP 连接的用户名
$ftp_user = "user";
  
//用户密码
$ftp_pass = "password";
   
//建立连接或者连接失败
$ftp = ftp_connect($ftp_server)
    or die("Could not connect to $ftp_server");
   
if($ftp) {
  echo "Successfully connected to $ftp_server!\n";
 
  //尝试登录
  if(@ftp_login($ftp, $ftp_user, $ftp_pass)) {
    echo "Connected as $ftp_user@$ftp_server\n";

    //要检查的文件
    $file = "demo.txt";

    //获取文件大小
    $file_size = ftp_size($ftp, $file);
    if ($file_size != -1) {
      echo "$file has $file_size bytes\n";
    } else {
      echo "Error getting file size\n";
    }
    
  } else {
    echo "Couldn't connect as $ftp_user\n";
  }
 
  //关闭连接
  if(ftp_close($ftp)) {
    echo "Connection closed successfully!\n"; 
  } 
}
?> 

上述代码的输出将是:

Successfully connected to ftp.example.com!
Connected as user@ftp.example.com
demo.txt has 8168 bytes
Connection closed successfully!