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PHP 5 File Create/Write

In this chapter we will teach you how to create and write to a file
on the server.

PHP Create File - fopen()

The fopen() function is also used to create a file. Maybe a little confusing, but in PHP, a file is created using the same
function used to open files.

If you use fopen() on a file that does not
exist, it will create it, given that the file is opened for writing (w) or
appending (a).

The example below creates a new file called "testfile.txt". The file will be
created in the same directory where the PHP code resides:

PHP File Permissions

If you are having errors when trying to get this code to run, check that you have granted your PHP file access to write
information to the hard drive.

PHP Write to File - fwrite()

The fwrite() function is used to write to a file.

The first parameter of fwrite() contains the name of the file to write to and
the second parameter is the string to be written.

The example below writes a couple of names into a new file called "newfile.txt":

Notice that we wrote to the file "newfile.txt" twice. Each time we wrote to
the file we sent the string $txt that first contained "John Doe" and second
contained "Jane Doe". After we finished writing, we closed the file using the fclose() function.

If we open the "newfile.txt" file it would look like this:

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PHP Overwriting

Now that "newfile.txt" contains some data we can show what happens when we
open an existing file for writing. All the existing data will be ERASED and we
start with an empty file.

In the example below we open our existing file "newfile.txt", and write some
new data into it:

If we now open the "newfile.txt" file, both John and Jane have
vanished, and only the data we just wrote is present:

Complete PHP Filesystem Reference

For a complete reference of filesystem functions, go to our complete
PHP Filesystem Reference.