php - file_put_contents在apache上失效

Question

代码

<?php

echo file_put_contents("/tmp/log.txt", "Hello world everyone.");

代码很简单，在浏览器和命令行上运行都显示成功，为：21。但是在浏览器运行后，/tmp/log.txt并不存在。而在命令行下，/tmp/log.txt创建成功（root和apache用户测试都没问题）。非常纠结。。。。。。。

操作系统： centos7

uname -r: 3.10.0-514.2.2.el7.x86_64

环境

都是通过yum install安装的，yum install httpd php5

Answer 1

The /tmp directory should have the maximum permissions. Is there no permission problem? Open the error message and see the error message

Answer 2

First, confirm the folder permissions to allow writing and then

<?php
echo file_put_contents($_SERVER['DOCUMENT_ROOT']."/tmp/log.txt", "Hello world everyone.");
文件路径 如果不加 $_SERVER['DOCUMENT_ROOT'] 的话 要写成 "./tmp/log.txt" 这样  你在试试吧

Answer 3

User questions? It is estimated that you are the root user under the command line, so the execution can be successful. Check to see if your web directory belongs to another user group, and this user group does not have read and write permissions on the temp directory.

Answer 4

Do you have permission? ! !

Answer 5

It should be a permissions issue. It is also unsafe for PHP to operate the tmp directory, so it is definitely not allowed by default.
Why is it said to be unsafe? Because if you can write, you must be able to read (for PHP, it is basically impossible to only write but not read without setting permissions)... In this case, hackers can read a lot of information

Answer 6

Simple and crude test: chmod -R 777 /tmp

Then see if it can be written.

Answer 7

Browser running / refers to the website root directory. Command line / refers to the server root directory. Please check whether there is a /tmp/log.txt file in the website root directory