How to solve the header 404 error reported in PHP

php editor Baicao will introduce to you today how to solve the problem of header 404 error reported in php. When we use the header function in the php code to jump to the page, a 404 error sometimes occurs. This may be caused by the header function outputting some content before. The solution is to ensure that nothing is output before calling the header function. You can buffer the output through the ob_start function, or check whether there are hidden characters such as spaces or carriage returns in the code. I hope these methods can help everyone solve the header 404 error problem!

To resolve header 404 errors, you first need to ensure that the HTTP response headers are set correctly. Here is a sample code:

header("HTTP/1.1 404 Not Found");
header("Status: 404 Not Found");

In the above code, the first line uses the header function to set the HTTP response header, specifying the 404 status code and corresponding status message. The second line uses the header function to set the Status response header, again specifying the 404 status code and corresponding status message.

Please note that the above code should be called before outputting anything, including any html tags, spaces, newlines, etc.

In addition to setting HTTP response headers, you can also consider the following solutions:

1. Check whether the requested URL is correct. Confirm that the requested resource actually exists and that the URL is not misspelled.
2. Check whether the file path and file name are correct. Confirm that the requested file actually exists and that the file path and file name are not misspelled.
3. Check file permissions. Confirm that the requested file has the correct read permissions so that Server can access the file.
4. Check server configuration. Confirm that the server configuration is correct, such as whether the .htaccess file is correctly configured, whether the rewrite rules are correct, etc.
5. Check serverlog. Check the server log files for more details about the 404 error, which can help determine the cause of the problem.

If the problem persists, you may need to further investigate the problem. You may need to review the code logic, debug the code, or contact the server administrator.

The above is the detailed content of How to solve the header 404 error reported in PHP. For more information, please follow other related articles on the PHP Chinese website!