PHP file writing for entering data to an new or existing file

We can write to a file by using fwrite() function PHP. Please note that we have to open the file in write mode and if write permission is there then only we can open it in write mode. If the file does not exist then one new file will be created. We can change the permission of the file also. However we can check the presence of a file by using file_exists function. You can read the content of a file by using fopen() function in PHP. This is the way to write entries to a guestbook, counter and many other scripts if you are not using any database for storing data. . Here we will see how to write to a file.

<?Php
$body_content="This is my content"; //Store some text to enter inside the file
$file_name="test_file.txt"// file name
$fp = fopen ($file_name, "w");// Open the file in write mode, if file does not exist then it will be created.
fwrite ($fp,$body_content);// entering data to the file
fclose($fp);// closing the file pointer

chmod($file_name,0777);// changing the file permission.
?>

Reading and Writing content to a file

We can read the content of a file and then apply required changes to it and save the same file. We can apply search and replacement of content by using str_replace and then save the file with changed content.

Here is the code

<?Php 
$filename=$_GET['file_name']; // To get the file name from URL 
//$filename='test.php'; // file name is stored

$fd = fopen ($filename, "r"); // opening the file in read mode
$contents = fread ($fd, filesize($filename)); // reading the content of the file
fclose ($fd);                                // closing the file pointer
$search=array("<h3>","</h3>","<br />");
$replace=array("<pre><code>","</code></pre>","");
$contents=str_replace($search,$replace,$contents);


$fd = fopen ($filename, "w"); // opening the file in write mode
//echo $contents;               // printing the file content of the file
fwrite ($fd,$contents);        // entering data to the file
chmod($filename,0777);       // Setting the write permission 

/// Opening the file in a new window and closing again ///// 

echo "
<script>
window.opener.location.href='$filename';
self.close();
</script>";
?>

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PHP File Write function

Reading and Writing content to a file

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