What to do if the php fopen function fails

The solution to the failure of the php fopen function: first add a PHP error report through "set_error_handler("customError");"; then modify the restrictions on PHP's access to the directory in the php configuration file php.ini.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

PHP fopen fails and returns false

I encountered a problem on December 14th. I just took some time to record it today. I hope it will be helpful to other friends who encounter this problem.

$fH = fopen("/tmp/test.log",'a');

In the above line of code, fopen actually returns false. It is neither a directory or file permissions-related issue, nor a file path issue (relative path, absolute path), etc., nor is it an issue with the mode of opening the file (r, w ,a etc.). After searching online for a while, I found that the reason for returning false is simply one of the three situations above, so I couldn't find the answer.

So I added a PHP error report:

//error handler function
function customError($errno, $errstr){ 
         echo "<b>Error:</b> [$errno] $errstr";
 }
//set error handler
set_error_handler("customError");

I found the reason immediately:

It turns out that I made the PHP access directory in the php configuration file php.ini Restrictions:

open_basedir= .

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