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。
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);
?>
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
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
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
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
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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