重命名PHP中的文件 [英] rename file in php

问题描述

我想从此代码将picture文件名(不带扩展名)重命名为old.jpg.

I want to rename picture filename (without extension) to old.jpg from this code.

我在父目录中有picture文件，并且路径正确

I have picture file in parent directory and the path is correctly

$old="picture";
$new="old.jpg";
rename($old , $new);

或此代码

$old="\picture";
$new="\old.jpg";
rename($old , $new);

$old="../picture";
$new="../old.jpg";
rename($old , $new);

$old="../picture";
$new="old.jpg";
rename($old , $new);

$old="./picture";
$new="./old.jpg";
rename($old , $new);

rename("picture", "old.jpg");

但是我得到这个错误:

 Warning: rename(picture,old.jpg) [function.rename]: The system cannot find the file specified. (code: 2) in C:\xampp\htdocs\prj\change.php on line 21

推荐答案

相对路径基于正在执行的脚本(在Web服务器中运行时为$_SERVER['SCRIPT_FILENAME'])，该脚本并不总是文件操作所用的文件地点:

A relative path is based on the script that's being executed ($_SERVER['SCRIPT_FILENAME'] when run in web server) which is not always the file in which the file operation takes place:

// index.php
include('includes/mylib.php');

// mylib.php
rename('picture', 'img506.jpg'); // looks for 'picture' in ../

查找相对路径涉及比较执行脚本和您要操作的文件的绝对路径，例如:

Finding a relative path involves comparing the absolute paths of both the executing script and the file you wish to operate on, e.g.:

/var/www/html/index.php
/var/www/images/picture

在此示例中，相对路径为:../images/picture

In this example, the relative path is: ../images/picture

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