将相关的数据组织成文件与目录的形式，是现代计算机的核心概念。所以，要获得文件信息或对其修改需要如下函数：
<?php
/**
* 获取文件的文件名
* basename(string path [, string suffix])
*/
$path = "./o.txt";
print_r(basename($path)); // o.txt
// 忽略后缀名
printf("Filename sans extension: %s", basename($path, '.txt')); // Filename sans extension: o
/**
* 获取路径目录
* dirname(string path)
*/
$path = "/home/users.txt";
print_r("Directory path: ". $path); // Directory path: /home/users.txt
/**
* 了解更多关于路径信息
* pathinfo(string path [, options])
*/
$pathinfo = pathinfo("/home/www/htdocs/book/index.html");
print_r($pathinfo);
/*Array
(
[dirname] => /home/www/htdocs/book
[basename] => index.html
[extension] => html
[filename] => index
)*/
// 返回指定数据
$pathinfo = pathinfo("/home/www/htdocs/book/index.html", PATHINFO_FILENAME); // index
/**
* 确定绝对路径
* realpath(string path)
*/
$textpath = realpath("./o.txt");
echo $textpath;
/* E:\work\app\phptest\o.txt */
/**
* 确定文件大小
* filesize(string filename)
*/
$file = realpath("./php.ini");
$bytes = filesize($file);
$kilobytes = round($bytes / 1024, 2);
printf("File %s is $bytes bytes, or %.2f kilobytes", basename($file), $kilobytes);
/* File php.ini is 72999 bytes, or 71.29 kilobytes */
/**
* 计算磁盘的可用空间
* disk_free_space(string directory)
*/
$drive = "E:";
printf("Remaining MB on %s %.2f", $drive, round(disk_free_space($drive) / 1024 ** 2, 2));
/* Remaining MB on E: 663196.99 */
echo "\r";
/**
* 计算磁盘总空间
* disk_total_space(string directory)
*/
$drive = "E:";
$totalSpace = disk_total_space($drive) / 1024 ** 2;
$userSpace = $totalSpace - disk_free_space($drive) / 1024 ** 2;
printf("Partition: %s (Allocated: %.2f MB. Used: %.2f MB. )", $drive, $totalSpace, $userSpace);
/* Partition: E: (Allocated: 953867.00 MB. Used: 290670.02 MB. ) */
echo "\r";
/**
* 确定目录内容大小
*/
function directorySize($directory)
{
$directorySize = 0;
if ($dh = opendir($directory))
{
// 迭代处理每个目录项
while (($filename = readdir($dh)))
{
if ($filename != "." && $filename != "..")
{
$newFilename = $directory . "/" . $filename;
// 确定大小并添加到总大小
if (is_file($newFilename))
$directorySize += filesize($newFilename);
// 新目录递归
if (is_dir($newFilename))
$directorySize += directorySize($newFilename);
}
}
}
closedir($dh);
return $directorySize;
}
$directory = 'E:/work/app/phptest';
$totalSize = round((directorySize($directory) / 1024 ** 2), 2);
printf("Directory %s: %f MB", $directory, $totalSize);
/* Directory E:/work/app/phptest: 0.080000 MB */
echo "\r";
/**
* 确定文件的最后访问时间
* fileatime(string filename)
*/
$file = './ext/php.ini';
printf("File last accessed: %s", date("m-d-y g:i:sa", fileatime($file)));
/* File last accessed: 08-23-19 4:57:58am */
echo "\r";
/**
* 确定文件的最后改变时间(不等于最后修改时间，这个表示的inode数据的任何改变，包括权限、所有者、组等)
* filectime(string filename)
*/
$file = './ext/php.ini';
printf("File inode last changed: %s", date("m-d-y g:i:sa", filectime($file)));
/* File inode last changed: 08-16-19 10:55:38am */
echo "\r";
/**
* 确定文件的最后修改时间(关于内容修改)
* filemtime(string filename)
*/
$file = './ext/php.ini';
printf("File last updated: %s", date("m-d-y g:i:sa", filemtime($file)));
/* File last updated: 08-23-19 4:57:58am */
echo "\r";
/**
* 打开和关闭文件
* fopen(string resource, string mode [, int use_include_path [, resource context]])
* 其中use_include_path传1则使用配置指令include_path
* mode:
* R 只读，文件指针至于文件开头
* r+ 读写，文件指针至于问价开头
* W 只写，删除文件内容，指针文件开头，文件不存在则创建
* w+ 读写，同上
* A 只写，文件指针末尾，文件不存在穿件。此模式称为追加
* a+ 读写，同上
* x 创建并打开只写的文件，文件不存在报错
* x+ 创建并以读写的方式打开文件，同上
*/
$file = './o.txt';
$fh = fopen($file, 'r');
// 关闭文件指针
fclose($fh);
/* File last updated: 08-23-19 4:57:58am */
echo "\r";
/**
* 读取文件
* file(string filename [int use_include_path[, resource context]])
*/
$user = file("o.txt");
print_r($user); // 返回array，按换行分隔数组
echo "\r";
/**
* 将文件内容读入字符串变量
* file_get_contents(string filename[, int use_include_path [, resource context, [int offset [, int maxlen]]]])
*/
$user = file_get_contents("o.txt");
print_r($user); // 返回string
echo "\r";
/**
* 写入文件
* fwrite(handle, string, [length])
*/
$subscriberInfo = "Jason Gilmore | xxx@xxx.com";
$fh = fopen("test.txt", 'a');
fwrite($fh, $subscriberInfo);
fclose($fh);
/**
* 写入文件
* file_put_contents(file, data, [mode, context])
* file 文件地址
* data 输入数据
* mode 方式
* - FILE_USE_INCLUDE_PATH (同上)
* - FILE_APPEND (追加)
* - LOCK_EX (加锁)
* 多个用|隔开
* context 规定文件句柄环境
*/
$subscriberInfo = "Jason Gilmore | xxx@xxx.com";
file_put_contents("test.txt", $subscriberInfo, FILE_APPEND | LOCK_EX);
echo "\r";
/**
* 目录相关
* 打开目录 opendir(path, [context])
* 关闭目录 closedir(resource)
* 解析目录内容 readdir(resource)
* 写入数组 scandir(directory, [sorting_order, context])
*/
// 输出所有文件和子目录
$dh = opendir('../phptest');
while ($file = readdir($dh))
echo "$file \r";
closedir($dh);
print_r(scandir('../phptest')); // array
