<?php
//文件本身的操作
//copy()复制文件
//unlink()删除文件
//ftruncate()将文件截断到指定的长度
//rename()重命名文件或目录
if(copy("data.txt","data_bak.txt")){//复制文件实例
echo "文件复制成功<br />";
}else{
echo "文件复制失败<br />";
}
if(file_exists("data_bak.txt")){//删除文件实例
if(unlink("data_bak.txt")){
echo "文件删除成功<br />";
}else{
echo "文件删除失败<br />";
}
}else{
echo "目标文件不存在<br />";
}
if(rename("file.jpg","file.txt")){//重命名文件实例
echo "文件重命名成功<br />";
}else{
echo "文件重命名失败<br />";
}
$fp=fopen("data_bak.txt","r+") or die("文件打开失败");
if(ftruncate($fp,1024)){
echo "文件截取成功";
}else{
echo "文件截取失败";
}
fclose($fp);
?>
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