PHP
5 File Create/Write
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
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":
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);
?>
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:
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:
Example
<?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
Complete PHP
Filesystem Reference
For a
complete reference of filesystem functions, go to our complete PHP Filesystem
Reference.
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