php fwrite append not working [closed] - php

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Hello I am trying to make a script that is based on HTML post and basic PHP.
I have 1 input on HTML, and I have this PHP code:
<?php echo'h'?>
One of my friends said that if I changed the w to an it would create a new line so I changed it and it is still not working.
Basically what I am trying to do is that when they enter the text box any word, it writes that word to the text document, but the second time it won't create a new line, I just want to create a new line.
Here is my full code:
<?PHP
$file_handle = fopen("sample.txt", "r");
$file_contents = $_POST['f1'];
fwrite($file_handle, $file_contents);
fclose($file_handle);
print "file created and written to";
?>

Answer 1

There is also other seemingly simpler functions by the names: file_put_contents() and file_get_contents(), which could be used (in your case) to make things a little easier to handle. The Code below shows the use of file_put_contents() and it's kin: file_get_contents() to accomplish the task.
<?php
$fileName = "sample.txt";
// GET THE TEXT TYPED-IN BY THE USER...
// ONLY YOU KNOW THE WAY TO GET THIS VALUE BUT WE CAN ASSUME (FOR NOW)
// THAT IT IS COMING FROM THE POST VARIABLE AND HAS THE NAME: input
$input = isset($_POST['input']) ? $_POST['input'] : null;
// FIRST TRY TO SEE IF THE FILE EXIST, OTHERWISE CREATE IT
// HOWEVER; WITH JUST AN EMPTY CONTENT
if(!file_exists($fileName)){
file_put_contents($fileName, "");
}
// DO THE SAVING ONLY IF WE HAVE ANY INPUT (STRING) TO SAVE
if($input){
// GET THE CURRENT CONTENTS OF THE FILE...
$fileContent = file_get_contents($fileName);
// ADD THE INPUT TO THE CURRENT CONTENTS OF THE FILE (WITH A NEW LINE)
$fileContent .= "\n{$input}";
// SAVE THE MODIFIED CONTENT BACK AGAIN...
$bytesSaved = file_put_contents($fileName, $fileContent);
// IF THE FILE WAS SUCCESSFULLY WRITTEN... THEN...
// DISPLAY A MESSAGE TO THAT EFFECT
if($bytesSaved){
print "file created and written";
}
}

Answer 2

I assume you want to add the line that has been posted to a previously stored file? In that case your code would look like this:
$file_handle = fopen("sample.txt", "a"); // append to previous contents
$file_contents = $_POST['f1'] . "\r\n";
fwrite($file_handle, $file_contents);
fclose($file_handle);
print "Content has been appended.";
More about the different fopen() modes can be found in the documentation, chapter "modes" and more about escape sequences (like \r\n) can be found in the Strings chapter.