Php write to file not working

I fixed the typo and it works fine. Thanks for the advice. I was hoping there was some easy debugging feature that did not require me to dig into the server error logs which I already did. I have confirmed that my problem is permissions. I do not have access to write to the directory, see errors below. With it being on a local server, I do have full control of the file directory create, delete, move, change files etc.

My guess is that the server requires another permission setting so that the files can be created via the browser.

Thanks for the input and the time. I figured it out. Everyhing works once I got the permissions in order. However, I do need to learn more about best-practice when setting permissions. I have a feeling this is not the best or safest way to enable sercurity permission. Did you type that in from MS Word? Those quotes look a bit crazy to me. Put this as the first line in your process.

The supplied documentation is vague, ambiguous and lacking, and the user comments contain erroneous information! The flock function follows the semantics of the Unix system call bearing the same name.

It is commonly called a reader lock. Only a single process may possess an exclusive lock to a given file at a time. If however, you call flock on a file on which you possess the lock, it will try to change it. When a file is closed the lock will be released by the system anyway, even if PHP doesn't do it explicitly anymore since 5.

The lock was kept alive until apache recycled those processes. This lack of proper clean up basically makes flock completely unreliable. Regarding the change in PHP 5. From 5. But note, that the operating system releases the lock automatically when the file is closed.

Actually, there is no use of the while loop with the usleep. It is almose guaranteed that the file will be locked, unless the script times out or something.

Consider these two scripts: 1st one is ran, and the second one is ran 5 seconds after the first. As soon as the first script finishes, the second one will acquire the lock and finish the execution. I have noticed that if you change the value of your fopen ressource, the lock is working no longer.. But only moves the pointer to the begining of the file.

Indeed, flock will not work reliably when the underlying filesystem is NFS. The proper way to perform file locking, in this case, would be to use PHP's link function.

In this context, a symbolic link exists, regardless of where its points to. The solution for per- forming atomic file locking using a lockfile is to create a unique file on the same fs e. If link returns 0, the lock is successful. Otherwise, use stat 2 on the unique file to check if its link count has increased to 2, in which case the lock is also successful.

I just want to add a note about making atomic lock on NFS, there is only two ways: - 1 the most robust but the most complicate - It's to use link to create a hard link to a file you want to lock on the same FS of course.

On most NFS implementations, Link is atomic Once you created a hard link not a symbolic link , with a unique randomly generated name, call stat on it and count the number of link nlink , if there is only 2 then the file is locked. If there is more than two you have to unlink the link you just created and create a new one with a new unique name else NFS will use its cache and stat will return wrong data then call stat on the new link and test the number of links again, repeat this operation until you get the lock.

A wrong timing could generate thousands of those files and a deadlock situation. Because of this when a deadlock situation occurs or if your stat command returns a very high number of links, you have to look for. Here's a handy class to allow retrying a write with flock a set number of times. Example 1 A simple fwrite example. Note : Writing to a network stream may end before the whole string is written. Note : On systems which differentiate between binary and text files i.

Windows the file must be opened with 'b' included in fopen mode parameter. Note : If stream was fopen ed in append mode, fwrite s are atomic unless the size of data exceeds the filesystem's block size, on some platforms, and as long as the file is on a local filesystem.

That is, there is no need to flock a resource before calling fwrite ; all of the data will be written without interruption. Submit a Pull Request Report a Bug. Parameters stream A file system pointer resource that is typically created using fopen. Return Values fwrite returns the number of bytes written, or false on error. Changelog Version Description 8.

Notes Note : Writing to a network stream may end before the whole string is written. After having problems with fwrite returning 0 in cases where one would fully expect a return value of false, I took a look at the source code for php's fwrite itself.

The function will only return false if you pass in invalid arguments. Therefore, looping with repeated calls to fwrite until the sum of number of bytes written equals the strlen of the full value or expecting false on error will result in an infinite loop if the connection is lost. Below is the example from the docs.