PHP 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:
Example
$myfile = fopen("testfile.txt", "w")
• 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":
Example
<?php
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = "John Doe\n";
fwrite($myfile, $txt);
$txt = "Jane Doe\n";
fwrite($myfile, $txt);
fclose($myfile);
?>
If we open the "newfile.txt" file it would look like this:
John Doe
Jane Doe
• 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:
<?php
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = "Mickey Mouse\n";
fwrite($myfile, $txt);
$txt = "Minnie Mouse\n";
fwrite($myfile, $txt);
fclose($myfile);
?>
If we now open the "newfile.txt" file, both John and Jane have vanished, and only the data we just wrote is present:
Mickey Mouse
Minnie Mouse
• PHP Append Text
You can append data to a file by using the "a" mode. The "a" mode appends text to the end of the file, while the "w" mode overrides (and erases) the old content of the file.
In the example below we open our existing file "newfile.txt", and append some text to it:
Example
<?php
$myfile = fopen("newfile.txt", "a") or die("Unable to open file!");
$txt = "Donald Duck\n";
fwrite($myfile, $txt);
$txt = "Goofy Goof\n";
fwrite($myfile, $txt);
fclose($myfile);
?>
If we now open the "newfile.txt" file, we will see that Donald Duck and Goofy Goof is appended to the end of the file:
Mickey Mouse
Minnie Mouse
Donald Duck
Goofy Goof