How to solve the problem of insufficient permissions in php fopen

藏色散人
Release: 2023-03-13 14:28:02
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php fopen权限不够的解决办法:1、打开终端命令窗口;2、在terminal中执行命令“sudo chmod 666 testOpen.php”即可。

How to solve the problem of insufficient permissions in php fopen

本文操作环境:linux5.9.8系统、PHP7.1版、DELL G3电脑

PHP使用fopen()函数打开文件提示权限不够问题

PHP fopen() 函数

函数定义和用法:fopen() 函数打开文件或者 URL。
语法:

fopen(filename,mode,include_path,context)

后两个参数是可选的,我们只用了前两个参数,代码如下:

<?php
//打开文件流
$myfile = fopen("newfile.txt", "w")        
or die("Unable to open file!");
//向文件中写入字符串
fwrite($myfile, "Hello World");
//关闭文件句柄
fclose($myfile);
?>
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代码所实现的功能为:以写入方式打开当前路径下的一个名称为newfile.txt的文件,如果文件不存在则尝试创建之。打开文件以后,向文件中写入Hello World字符串,最后关闭文件。

当前文件夹路径下没有newfile.txt文件,此时执行上述代码出现错误如下:

Warning: fopen(newfile.txt): failed to open stream: 权限不够 in
/home/yums/web/blog_for_r&d/scripts/testOpen.php on line 3
Unable to open file!

权限不够?Linux下最常出现的问题哈,是没有在硬盘上创建文件的权限吗?我尝试给testOpen.php赋更高的权限吧,于是我就在terminal中执行了如下命令:

sudo chmod 666 testOpen.php
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这样PHP文件就有了创建文件的权限了吧,我再刷新页面试试,WTF,还是原来那个问题!

Warning: fopen(newfile.txt): failed to open stream: 权限不够 in
/home/yums/web/blog_for_r&d/scripts/testOpen.php on line 3
Unable to open file!

算了,我不用这个函数来创建文件了,我用gedit自己创建newfile.txt文件好了。于是我在terminal中执行了如下命令:

gedit newfile.txt
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这样我就创建好了一个文件,再刷新,还是权限不够,我还是看一下这个newfile.txt文件到底有什么权限吧,在terminal中执行如下命令:

ls -all
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发现用记事本创建的newfile.txt只有读权限,没有写入的权限,好吧问题出在这呢,给newfile.txt文件提升写的权限吧:

sudo chmod 666 newfile.txt
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现在再刷新页面,没有报错了,文件中也写入了相应的字符串。

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