The Complete Manual of PHP - File System
1. 目录操作
$dir="C:";
if(is_dir($dir)){ 验证路径的有效性
$dir_res=opendir($dir); 返回一个资源对象，用于存储当前的目录资源
while($filen=readdir($dir_res)){ 读取目录中的文件
echo $filen."<br>";
}
closedir($dir_res);关闭目录
}
else
echo "目录不存在！";
$dir2="Test/";
if(!is_dir($dir2)){
mkdir($dir2); 创建目录
}
if(is_dir($dir2)){
rmdir($dir2); 删除目录
}2. 文件读取
$path="Test\\1.txt"; $filesize=filesize($path);#获取文件的长度 $file=fopen($path, "r");#打开文件 echo $filesize."字节<br>"; echo fgetc($file)."<br>";#读取一个字符, echo fgetc($file)."<br>";#读取后指针下移 echo fgets($file)."<br>";#从指针出开始读取一行 echo fgets($file)."<br>"; echo fread($file, $filesize); #从指针出开始读取指定长度的字符串 fclose($file);
3. 文件写入
$path="Test\\1.txt"; $filesize=filesize($path);#获取文件的长度 $file=fopen($path, "w"); fwrite($file, "Hello World!\n",20);#写入的字符串，要写入的长度 fwrite($file, "This is a test!\n"); fclose($file); unlink($path);#删除文件
4. fopen文件时，若文件不存在，则自动创建该文件
$path="DB/";
$filename="S".date("YmdHis").".dat";
$fp=fopen($path.$filename, "w");
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